PenguinTools
Over 400 completely free web tools available. Browser-based with no installation required for maximum security.
Text Tools
Text editing, conversion, and analysis tools
Character Counter
A simple tool to count characters in your text. Supports word, line, and paragraph counting, plus space exclusion.
Special Characters
Copy frequently used special characters with one click. Arrows, math symbols, currency, and more.
Emoticons
Copy cute emoticons with one click. Rich variations for emotions, greetings, actions, and more.
Case Converter
Convert text case in bulk. Supports UPPER, lower, camelCase, snake_case, kebab-case, and 10 more formats.
Find and Replace
Search for strings in text and replace them in bulk. Supports case sensitivity and regex pattern matching.
Duplicate Line Remover
Automatically detect and remove duplicate lines from text. Options for case sensitivity and trimming whitespace.
Line Sorter & Reorderer
Sort text lines in a specified order. Supports 6 modes: ascending, descending, random, reverse, length, and more.
Text Reverser & Reorder Tool
Reverse the order of characters, words, or lines in your text. Accurately handles Unicode characters and emojis.
Empty Line Remover
Remove unnecessary empty lines from text. Choose to remove all, whitespace-only lines, or compress consecutive blanks.
Line Break Remover & Adder
Bulk remove, add, or convert line breaks in text. Supports \n and <br> conversion and adding breaks at delimiters.
Extra Spaces Remover
Detect and remove excess spaces from text. Three modes: compress consecutive spaces, trim edges, or remove all.
Lorem Ipsum Generator
Generate placeholder "Lorem Ipsum" dummy text. Specify output by paragraphs, sentences, or words.
Text Diff Checker
Compare two texts and visualize the differences. Added and removed lines are highlighted in color.
Text Repeater
Repeat any text a specified number of times. Customize separators including line breaks, spaces, and custom delimiters.
Line Number Adder
Automatically add line numbers to each line of text. Customize starting number, format, and zero-padding.
Prefix & Suffix Adder
Add prefixes and suffixes to each line of text in bulk. Useful for inserting HTML tags or processing CSV data.
Comma Separator
Convert line-separated or list text to comma-separated format. Supports tabs, semicolons, and custom delimiters.
Tabs to Spaces Converter
Convert between tabs and spaces in your text. Customize indent width (2/4/8 spaces, etc.).
Text Splitter
Split text by character count, delimiter, or line count. Ideal for breaking down long texts into manageable parts.
Fullwidth/Halfwidth Converter
Convert between fullwidth and halfwidth characters, commonly used in CJK (Chinese, Japanese, Korean) text processing. Standardize character widths for data normalization and formatting.
Hiragana & Katakana Converter
Convert between Japan's two phonetic scripts: Hiragana (rounded, for native words) and Katakana (angular, for loanwords). Kanji and alphabetic characters are preserved as-is.
Reading Time Calculator
Estimate how long it takes to read your text based on word count. A helpful reference for blog posts and article writing.
Speaking Time Calculator
Estimate speech or presentation time from your script's word count. Adjust speaking speed to find the optimal script length.
Readability Score Calculator
Score text readability using multiple metrics. Objectively assess difficulty level and identify areas for improvement.
Letter Frequency Counter
Count the frequency of each character in your text. Visualize distribution with charts for intuitive analysis.
Email Address Extractor
Automatically detect and extract email addresses from text. Remove duplicates and copy or download results.
URL Extractor
Automatically detect and extract URLs from text. Useful for link checking and organizing URL lists.
Text Column Extractor
Extract specific columns from tab-separated or CSV text. Perfect for processing spreadsheet data.
Word Wrap Tool
Automatically wrap text at a specified character width. Ideal for formatting emails and code comments.
Text to Handwriting Converter
Convert typed text into handwriting-style images. Great for creating letters and message cards.
ASCII Art Text Generator
Convert text into large ASCII art characters. Choose from multiple font styles.
Word Cloud Generator
Generate word clouds based on word frequency in your text. Customize colors and layout, then export as an image.
Fancy Text Generator
Convert text into Unicode fancy characters and copy. Perfect for decorating social media profiles and posts.
Strikethrough Text Generator
Add Unicode strikethrough to your text. Works with both English and Japanese characters, perfect for showing corrections.
Underline Text Generator
Add Unicode underlines to your text. Works with both English and Japanese characters, great for emphasis.
Bold Text Generator
Convert text into Unicode bold characters and copy. Works with alphanumeric characters, great for emphasizing social media posts.
Italic Text Generator
Convert text into Unicode italic characters and copy. Works with alphanumeric characters, ideal for decorating profiles.
Tiny Text Generator
Convert text into Unicode small characters (superscript). Works with alphanumeric characters, great for annotations on social media.
Upside Down Text Generator
Flip your text upside down using Unicode characters. Works with alphanumeric characters, perfect for eye-catching social media posts.
Mirror Text Generator
Reverse your text to create mirror writing. Works with alphanumeric characters, fun for creating secret messages.
Bubble Text Generator
Convert text into circled bubble characters. Works with alphanumeric characters, choose between filled and outlined styles.
Gothic Text Generator
Convert text into Unicode gothic (Fraktur) characters. Works with alphanumeric characters, creating a medieval aesthetic.
Emoji Picker
Browse and search emojis by category and copy with one click. Supports Unicode versions and skin tone selection.
Invisible Character Copy
Copy zero-width spaces and invisible characters with one click. Useful for text separators and watermark embedding.
Leetspeak (1337) Converter
Convert text into Leetspeak (1337 notation). Great for gaming usernames and social media accents.
Pig Latin Translator
Convert English text into Pig Latin word play. Perfect for language classes and party games.
Bionic Reading Converter
Convert text to Bionic Reading format by bolding the beginning of each word for faster reading. Adjust bold intensity and export as HTML.
Title Case Converter
Convert titles to proper capitalization following AP, APA, Chicago, and other style guides. Accurately applies exception rules for articles and prepositions.
Text to List Converter
Convert text into bullet points, numbered lists, or HTML/Markdown lists. Customize delimiters and remove blank lines or duplicates.
Rich Text to Markdown Converter
Convert rich text or web page content to Markdown by simply pasting. Auto-detects headings, tables, links, and other formatting.
Side-by-Side Text Compare
Compare two texts side by side with highlighted differences. Supports character-level diff detection and synchronized scrolling.
Image Tools
Image editing, conversion, and optimization tools
Background Removal
Remove image backgrounds automatically with AI. Completely free and privacy-focused. Batch processing supported for efficient multi-image handling.
Image Crop
Freely crop images with drag operations. Select the area you need and extract only that part.
Image Compressor
Compress and reduce image file size in the browser. Supports JPEG, PNG, and WebP with before/after size comparison.
Image Format Converter
Convert images between PNG, JPG, WebP, and AVIF formats. Includes output quality adjustment and before/after preview.
Image Crop & Trim Tool
Crop and trim images freely with drag operations. Supports fixed aspect ratios like 1:1 and 16:9, and pixel-specific dimensions.
Image Rotate & Flip
Rotate images to any angle or flip them horizontally/vertically. Supports both 90-degree increments and custom angle rotation.
Mosaic & Blur Tool
Apply mosaic or blur effects to selected areas of an image. Adjust block size or switch to Gaussian blur.
Image Filters
Apply sepia, grayscale, vintage, and other effects to images. Adjust filter intensity with sliders while previewing results.
Image Brightness & Contrast Adjuster
Adjust image brightness, contrast, and saturation with sliders. Also supports hue adjustment and auto-correction optimization.
Image Black & White Converter
Convert color images to monochrome or black and white. Supports three modes: grayscale, threshold, and dithering.
Image Watermark Tool
Add text or image watermarks to your images. Fine-tune font, position, opacity, and tiled placement settings.
Image Metadata Remover
Remove EXIF, GPS, and camera information from images. Strip personal data like location info before posting to social media.
Image Round Corner Tool
Round the corners of images and export as PNG. Set different radii for each corner, with circle crop support.
Image Splitter
Split images evenly into a grid of specified rows and columns. Perfect for Instagram 3x3 grids — download all split images at once.
Photo Collage Maker
Combine multiple images into one collage. Includes layout templates, background color, and padding settings.
Meme Generator
Create meme images with top and bottom text overlays. Customize font, size, color, and text outline freely.
Favicon Generator
Generate website favicons from images. Output multiple sizes from 16x16 to 512x512 at once.
SVG to PNG Converter
Convert SVG images to PNG format at any size. Supports direct SVG code input and up to 4x high-resolution output.
Image to ASCII Art Converter
Convert images into ASCII art (text-based artwork). Adjust resolution and contrast for best results.
Pixel Art Maker
Create pixel art by painting on a grid-based canvas. Choose from color palettes and adjust grid size as needed.
Image Steganography
Hide and extract secret text messages within images. Uses steganography to conceal information without visible changes.
Low Poly Image Generator
Transform photos into artistic low-polygon style images. Adjust polygon count and color accuracy for your desired look.
Dithering Art Generator
Apply dithering effects to images for a retro pixel-art look. Choose from multiple algorithms and color counts for unique results.
Halftone Image Generator
Convert images into halftone dot patterns. Adjust dot size and angle for a pop-art style finish.
Kaleidoscope Effect
Transform images into symmetrical kaleidoscope patterns. Adjust segment count and rotation angle to create mesmerizing designs.
Images to GIF Converter
Create GIF animations from multiple images. Customize frame delay and loop settings as needed.
GIF Frame Extractor
Split GIF animations into individual frames. Download each frame separately for editing or reuse.
Image Stitcher
Combine multiple images into one by stitching them vertically or horizontally. Perfect for joining screenshots or photos into a single image.
Symmetry Image Generator
Create symmetrical art by mirroring images horizontally or vertically. Adjust the axis position and direction for unique visual effects.
Screenshot Beautifier
Add gradient backgrounds and shadows to your screenshots. Create polished images for social media posts and blog articles.
Image Border Tool
Add borders and frames to your images for decoration. Customize border width, color, and style freely.
Image Logo Overlay
Overlay logos or icons onto images. Adjust position, size, and opacity — also works as a watermark tool.
Photo Merger
Merge two or more photos into one using blending and layout options. Adjust transparency and composition mode for natural results.
Noise Image Generator
Generate Perlin noise, white noise, and other pattern images. Useful for creating textures and background images.
Image Threshold Converter
Convert images to black and white using threshold binarization. Adjust the threshold value for optimal contrast.
Line Drawing Effect
Convert photos into pencil sketch-style line drawings. Adjust line weight and intensity for an illustration-like finish.
Oil Painting Filter
Transform photos into oil painting-style artwork. Adjust brush size and texture for a painterly finish.
Vignette Effect
Apply a vignette effect to darken the edges of your images. Draw focus to the center and create an atmospheric look.
Emboss Effect
Apply an emboss (raised relief) effect to images. Adjust direction and intensity for a 3D textured appearance.
Blur Effect
Apply blur effects to images. Choose from Gaussian, box, and motion blur types.
Swirl Effect
Apply a swirl distortion effect to images. Customize rotation angle, radius, and center position freely.
Identicon Generator
Generate unique geometric avatars (Identicons) from any text string. Choose from multiple styles including GitHub-style and pixel block.
Add Text to Image
Add and style text or captions on your images. Supports drag positioning, font selection, and text outline effects.
Math Tools
Mathematics, statistics, and probability tools
Percentage Calculator
Calculate percentages easily. Instantly compute ratios, rate of change, and percent values.
Split Bill Calculator
Easily split bills for dining and parties. Instantly calculate per-person amount.
Random Number Generator
Generate random numbers within a specified range. Customize count, decimal places, and duplicate control.
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal. Also supports custom base conversion (base 2 to 36).
GPA Calculator
Calculate your GPA (Grade Point Average) from course grades. Supports credit-weighted calculations.
Ratio Calculator
Calculate, simplify, and solve ratios. Solve for unknown values in A:B = C:D proportions.
Fraction Calculator
Perform arithmetic operations on fractions (add, subtract, multiply, divide). Automatic common denominator and simplification.
GCD & LCM Calculator
Calculate the greatest common divisor and least common multiple of two or more integers. Supports multiple numbers at once.
Prime Factorization Calculator
Factorize integers into prime factors. Also supports primality testing and divisor enumeration.
Factorial Calculator
Calculate factorials (n!). Handles large factorials with high precision.
Exponent Calculator
Calculate exponents (powers). Compute x^n with high precision.
Square Root & Nth Root Calculator
Calculate square roots, cube roots, and nth roots in one tool. Customize the root degree and view a common square roots table.
Logarithm Calculator
Calculate common logarithms, natural logarithms, and logarithms with any base. Supports log₁₀, ln, and custom base with a log table included.
Permutation Calculator
Calculate permutations (nPr) — the number of ways to arrange r items from n. Displays the formula and handles large numbers.
Combination Calculator
Calculate combinations (nCr) for choosing r items from n. View calculation steps and visualize with Pascal's triangle.
Probability Calculator
Calculate event probability as fractions, decimals, and percentages. Supports AND/OR compound events and complement calculations.
Mean, Median & Mode Calculator
Calculate mean, median, and mode of a data set at once. Also displays range, sum, count, and sorted data.
Standard Deviation Calculator
Calculate standard deviation and variance to measure data spread. Supports both population and sample calculations with step-by-step details.
Standard Score Calculator
Calculate standard scores (deviation values) from test scores. View percentile rankings and batch calculations.
Quadratic Equation Calculator
Solve quadratic equations (ax²+bx+c=0) by entering coefficients. Classifies solutions by discriminant with step-by-step calculations and graph plotting.
System of Equations Solver
Solve systems of 2 or 3 linear equations automatically. Shows step-by-step solutions and handles no-solution or infinite-solution cases.
Trigonometry Calculator
Calculate sin, cos, tan, and other trigonometric function values. Supports degree/radian modes, inverse functions, and hyperbolic functions.
Pythagorean Theorem Calculator
Calculate the missing side of a right triangle using the Pythagorean theorem. Solve for any side with diagram and step-by-step formula display.
Scientific Calculator
A full-featured calculator with trigonometric, logarithmic, and exponential functions. Includes calculation history, memory functions, and keyboard input support.
Online Calculator
A web-based calculator for basic arithmetic and percentage calculations. Optimized for both touchscreen and keyboard numpad input.
Matrix Calculator
Calculate matrix addition, subtraction, multiplication, determinant, inverse, and transpose. Supports up to 10x10 matrices with step-by-step row operations.
Vector Calculator
Calculate dot product, cross product, magnitude, and angle between vectors. Supports 2D and 3D vectors with visual graph display.
Complex Number Calculator
Perform arithmetic, modulus, and argument calculations on complex numbers. Supports polar form conversion and complex plane visualization.
Z-Score Calculator
Calculate Z-scores (standard scores) and visualize position on the normal distribution. Also computes percentiles and probabilities.
Weighted Average Calculator
Calculate weighted averages by assigning weights to each item. Great for grade calculations and score aggregation.
Expected Value Calculator
Calculate expected values (mean) from probability distributions. Ideal for gambling odds and investment decision simulations.
Modulo Calculator
Instantly calculate the remainder of division (mod operation). Handles negative numbers and large values.
Scientific Notation Converter
Convert between standard numbers and scientific notation. Useful for working with very large or very small values.
Decimal to Fraction Converter
Convert decimals to fractions and fractions to decimals. Automatically simplifies and converts to mixed numbers.
Fibonacci Sequence Generator
Generate the Fibonacci sequence up to a specified number of terms. Useful for math study and test data generation.
Prime Number Checker & Generator
Instantly determine if a number is prime. Also generate a list of primes within a specified range.
Dog Age Calculator
Convert your dog's age to human years. Calculations account for breed size differences.
Cat Age Calculator
Convert your cat's age to human years. View care guidelines for each life stage.
Tip Calculator
Calculate tip amounts and split bills per person. Perfect for dining out and group payments.
Slope Calculator
Calculate the slope and equation of a line from two points. Also computes the y-intercept and distance between points.
Circle & Sphere Calculator
Calculate area, circumference, volume, and surface area for circles and spheres. Compute from either radius or diameter.
Triangle Calculator
Calculate sides, angles, area, and perimeter of triangles. Supports right, isosceles, equilateral, and scalene triangles.
Trapezoid Area Calculator
Calculate trapezoid area and perimeter from parallel sides and height. Also computes leg lengths and diagonals.
Shape Area Calculator
Calculate the area of various shapes including rectangles, pentagons, hexagons, and ellipses. Simply enter side lengths or radii to get results.
3D Shape Volume Calculator
Calculate the volume of various 3D shapes including rectangular prisms, cylinders, cones, and pyramids. Surface area is also calculated.
Aspect Ratio Calculator
Calculate and convert aspect ratios for images and videos. Automatically compute width and height when resizing.
Number Sequence Generator
Generate arithmetic, geometric, Fibonacci, and other number sequences. Useful for test data and learning purposes.
Number Sorter & Filter
Sort number lists in ascending or descending order and filter by conditions. Also supports duplicate removal and range filtering.
Gradient / Slope Calculator
Calculate gradient, slope angle, and percent grade from rise and run. Useful for road design and ramp planning.
Scale Calculator
Calculate actual dimensions from map or drawing scales. Also supports scale ratio conversion and reverse distance calculation.
100-Grid Math Drill
A 10×10 grid math drill tool to practice arithmetic skills. A popular calculation training method widely used in Japanese education.
Rounding Calculator
View round half up, ceiling, and floor results at once. Specify decimal places and compare rounding methods side by side.
Significant Figures Calculator
Automatically determine the number of significant figures and round results correctly. Essential for chemistry and physics lab reports.
Golden Ratio Calculator
Calculate lengths and ratios based on the golden ratio (1:1.618). Useful for design and layout dimension planning.
Normal Distribution Calculator
Calculate probability, CDF, and percentile for normal distributions. Just enter mean and standard deviation to see the distribution graph.
Binomial Distribution Calculator
Calculate probability, expected value, and variance for binomial distributions. Determine statistics from the number of trials and success probability.
Confidence Interval Calculator
Statistically calculate confidence intervals for means and proportions. Specify sample size and confidence level to perform interval estimation.
Regression Analysis Tool
Automatically calculate and visualize regression lines and curves from data. Useful for checking R-squared and regression equations.
Correlation Coefficient Calculator
Calculate Pearson and Spearman correlation coefficients between two data sets. Visualize data relationships with a scatter plot.
Percentile Calculator
Calculate any percentile value from a data set. Also useful for finding quartiles and medians.
Variance Calculator
Calculate variance, standard deviation, and coefficient of variation at once. View both population and sample results simultaneously.
Force & Acceleration Calculator
Calculate force, mass, or acceleration using Newton's second law (F=ma). Enter any two values to automatically solve for the third.
Kinetic Energy Calculator
Calculate kinetic energy from an object's mass and velocity. Supports unit conversion and reverse calculation for physics problems.
Work & Power Calculator
Calculate work and power from force, distance, and time. Perfect for physics problem-solving and energy calculations.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power based on Ohm's Law (V=IR).
Tile Calculator
Calculate the number of tiles needed based on room and tile dimensions. Includes waste factor for accurate ordering estimates.
Concrete Calculator
Calculate the amount of concrete needed from project dimensions. Specify thickness and shape to determine volume and weight.
Wallpaper Calculator
Calculate the number of wallpaper rolls needed from room dimensions. Accurately deducts window and door areas for precise estimates.
Flooring Calculator
Calculate the amount of flooring material needed from room dimensions. Includes waste factor for accurate ordering estimates.
Momentum Calculator
Calculate momentum (p=mv) from an object's mass and velocity. Supports unit switching and reverse calculation from momentum.
Potential Energy Calculator
Calculate gravitational potential energy (U=mgh) from mass, height, and gravity. Supports calculations for other planets like the Moon and Mars.
Density Calculator
Calculate density (ρ=m/V) from mass and volume. Supports reverse calculation and comparison with common materials.
Resistor Color Code Calculator
Read resistance values from resistor color bands. Also supports reverse lookup from resistance value to color code.
Force Unit Converter
Convert between force units like Newton, Dyne, and kilogram-force. All unit conversions are displayed instantly as you type.
Frequency Unit Converter
Convert between frequency units like Hz, kHz, MHz, and GHz. Also supports period (seconds) and RPM conversion.
Density Unit Converter
Convert between density units like kg/m³, g/cm³, and lb/ft³. Includes reference densities for common materials.
Electric Current Unit Converter
Convert between electric current units like Ampere, Milliampere, and Microampere. Supports scientific notation for very small and large values.
Fuel Economy Converter
Convert between fuel economy units like km/L, L/100km, and MPG. Also calculates fuel cost from economy and distance.
GPS Coordinate Converter
Convert between GPS coordinate formats: DMS, decimal degrees, and degrees-minutes. Instantly converts any format to all others.
Biorhythm Calculator
Calculate your physical, emotional, and intellectual biorhythm cycles from your date of birth. View wave graphs to identify peak and critical days.
Finance & Tax
Tax calculation, investment, and loan simulation tools
Compound Interest Calculator
Simulate compound interest on investments. Calculate future asset value from principal, rate, and period.
Markup Calculator
Calculate markup percentage and selling price from cost. Set prices based on your target profit.
Margin Calculator
Calculate profit margin from selling price and cost. Also see the difference between margin and markup.
Discount Calculator
Calculate discounted prices and savings from a discount percentage. Compare multiple discount rates side by side.
Break-Even Calculator
Calculate the break-even point from fixed and variable costs. Determine the required sales volume and revenue targets.
Loan Calculator
Calculate monthly payments, total payments, and interest for loans. Includes a full amortization schedule.
Savings Goal Calculator
Calculate monthly savings needed or time required to reach your goal. Supports interest rate simulations for accurate projections.
ROI Calculator
Automatically calculate return on investment (ROI) and profit/loss. Compare and evaluate multiple investment options.
Rule of 72 Calculator
Calculate how long it takes for an investment to double using the Rule of 72. Compare doubling times across different interest rates.
50/30/20 Budget Calculator
Allocate your income using the 50/30/20 rule for needs, wants, and savings. Just enter your take-home pay to see your ideal budget breakdown.
FIRE Calculator (Early Retirement)
Estimate when you can achieve Financial Independence, Retire Early (FIRE). Simulate different savings rates and investment returns.
Future Value Calculator
Estimate the future value of your investments. Enter interest rate, time period, and contributions to see compound growth.
Amortization Calculator
View your full loan amortization schedule at a glance. See monthly principal and interest breakdowns with visual charts.
Mortgage Calculator
Calculate your monthly mortgage payment and total cost. Compare repayment plans by adjusting interest rates and loan terms.
Date & Time
Date calculation, age calculator, and calendar tools
Date Calculator
Calculate days between two dates instantly. Check elapsed or remaining days easily.
Age Calculator
Calculate current age from birthdate. Display detailed years, months, and days.
Time Calculator
Easily add or subtract time. Perfect for calculating work hours and task duration.
Japanese Era Converter
Convert between the Western (Gregorian) calendar and Japan's unique "Wareki" era-based calendar system. Supports 5 eras: Reiwa, Heisei, Showa, Taisho, and Meiji.
Countdown Timer
Start a countdown from a specified time. Set hours, minutes, and seconds with alarm notification.
Stopwatch
An online stopwatch you can use in your browser. Record and display lap times with ease.
Pomodoro Timer
Boost focus with the Pomodoro Technique. Automatically manages 25-minute work + 5-minute break cycles.
World Clock
View current times around the world at a glance. Compare multiple time zones side by side.
Work Hours Calculator
Calculate work hours from clock-in and clock-out times. Automatically deducts break time.
Day of the Week Calculator
Instantly find the day of the week for any date. Works for both past and future dates.
Leap Year Checker
Instantly determine whether a given year is a leap year. Also shows when the next leap year occurs.
Week Number Calculator
Find the ISO 8601 week number for any date. View the full year calendar with week numbers.
Day Counter
Calculate days remaining until or elapsed since a specified date. View results in days, weeks, months, and years.
Health & Fitness
BMI, calorie, and diet calculation tools
BMI Calculator
Calculate BMI (Body Mass Index) from height and weight. Check your health status.
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) based on age, gender, and body measurements. Useful as a baseline for diet and nutrition planning.
Body Fat Calculator
Estimate your body fat percentage from body measurements. Compare results from multiple calculation methods.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) based on activity level. Get accurate calorie estimates tailored to your exercise habits.
Calorie Calculator
Calculate daily calorie intake needed for your target weight. Compare plans for weight loss, gain, and maintenance.
Macro Calculator
Calculate target intake for protein, fat, and carbohydrates. Automatically compute macro ratios based on your goals.
Ideal Weight Calculator
Calculate your ideal weight range based on height and gender. Compare results from multiple calculation formulas.
Pace Calculator
Calculate running or walking pace, time, and distance. Perfect for setting goals for marathons, half marathons, and more.
Sleep Cycle Calculator
Calculate optimal wake-up and bedtimes based on sleep cycles. Find the best times to wake up feeling refreshed.
Developer Tools
Web development and programming tools
Password Generator
Generate strong random passwords instantly. Customize length and character types freely.
JSON Formatter & Validator
Format and validate JSON data for readability. Supports indent adjustment and single-line compression (minify).
UUID/GUID Generator
Generate UUID v4 with one click. Bulk generate up to 100 UUIDs with uppercase and hyphen options.
URL Slug Generator
Generate SEO-friendly URL slugs from text. Automatically removes special characters and handles transliteration.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Also get the current timestamp instantly.
QR Code Scanner
Read and decode QR codes from uploaded images. URLs are displayed as clickable links, and text can be copied with one click.
Barcode Generator
Generate barcodes in Code128, EAN-13, Code39, and other formats. Adjust bar width and height, and export as PNG or SVG.
Regex Tester
Test regular expression patterns with real-time match results. Supports capture groups and g/i/m flag options.
Markdown to HTML Converter
Convert Markdown text to HTML code. Supports GFM tables, checklists, and code blocks.
HTML to Markdown Converter
Convert HTML code to Markdown format. Preserves table and list structures while automatically removing unnecessary tags.
HTML Formatter
Automatically format and indent HTML code for readability. Switch between 2/4 spaces and tabs, or minify to a single line.
CSS Formatter
Automatically format and indent CSS code for readability. Supports per-property line breaks and single-line minification.
JavaScript Formatter
Automatically format JavaScript code for readability. Supports ES6+ syntax and can switch to minified output.
SQL Formatter
Automatically format SQL queries with proper indentation and keyword alignment. Supports MySQL, PostgreSQL, SQLite syntax and subqueries.
XML Formatter
Format XML code with proper indentation for readability. Includes syntax validation and minification.
CSS Minifier
Remove whitespace, line breaks, and comments from CSS to reduce file size. View before/after size comparison with 20–50% typical reduction.
HTML Minifier
Remove unnecessary whitespace, line breaks, and comments from HTML. Preserves whitespace in pre tags and attribute quotes.
JavaScript Minifier
Remove whitespace and comments from JavaScript to reduce file size. Preserves variable names, strings, and regular expressions.
JSON to CSV Converter
Convert JSON data to CSV table format. Supports delimiter selection and .csv file download.
CSV to JSON Converter
Convert CSV data to JSON object arrays. Auto-detect delimiters and use header rows as key names.
JSON to XML Converter
Convert JSON data to XML tag structure. Supports root element naming and indented output formatting.
JSON to YAML Converter
Convert JSON data to YAML format. Accurately converts nested structures with configurable indent width.
YAML to JSON Converter
Convert YAML data to JSON format. Includes syntax error detection and customizable JSON indentation.
JSON Tree Viewer
Browse JSON data in an expandable/collapsible tree structure. Color-coded value types and JSONPath display for selected nodes.
CSV Viewer
View CSV files in a readable table format. Sort by columns, search data, and support multiple delimiters.
Markdown Editor
Markdown editor with real-time preview. Supports GFM syntax, code syntax highlighting, and HTML output.
Cron Expression Generator
Build cron expressions using an intuitive GUI. View human-readable descriptions and preview upcoming execution times.
JWT Decoder
Paste a JWT token to decode its header and payload. Displays expiration date/time and color-coded token structure.
Naming Convention Converter
Convert between programming naming conventions. Supports camelCase, snake_case, kebab-case, and more.
PX to REM Converter
Convert between CSS px and rem values. Customize the base font size for accurate conversions.
Chmod Calculator
Convert between numeric and symbolic Unix file permissions. Generate chmod commands for quick permission setup.
.htpasswd Generator
Generate .htpasswd entries for Apache Basic Authentication. Supports MD5, SHA1, and bcrypt encryption algorithms.
Code to Image Converter
Export source code as beautiful images. Supports syntax highlighting and theme customization.
HTML Live Preview
Preview HTML, CSS, and JavaScript in real time. Perfect for testing code snippets and verifying behavior.
Math Formula Editor
Create math formulas using LaTeX notation and export as images or code. Perfect for reports, slides, and academic papers.
OG Meta Preview
Preview how your OGP meta tags will appear when shared on social media. Check how your page looks on Twitter and Facebook before publishing.
CSS Specificity Calculator
Calculate and compare CSS selector specificity scores. Understand style priority to improve your CSS architecture.
Dummy Data Generator
Generate bulk dummy data for testing purposes. Supports names, addresses, emails, and more.
UTM Link Builder
Build URLs with UTM parameters using a simple form. Essential for Google Analytics campaign tracking.
Image Placeholder Generator
Generate placeholder images with custom size, color, and text. Perfect for web design mockups and prototyping.
Random String Generator
Generate random strings with custom length and character types. Useful for creating passwords and API keys.
Flowchart Maker
Create and export flowcharts for workflows and processes. Build diagrams intuitively with drag-and-drop and auto-layout.
Mind Map Maker
Create mind maps to organize ideas and information radially. Quickly expand and edit branches using keyboard shortcuts.
Sequence Diagram Maker
Create sequence diagrams showing interactions between objects over time. Define messages using text notation or GUI controls.
Organization Chart Maker
Create and export organizational structure charts in tree format. Supports job title display and design template selection.
Family Tree Maker
Visualize your family lineage in a tree format. Supports automatic generation placement and marriage relationships.
Chart Generator
Generate bar charts, line charts, pie charts, and more from your data. Supports CSV and Excel paste for quick chart creation.
Heatmap Generator
Visualize data values as color intensity in a heatmap. Supports CSV input and custom color scale configuration.
Sankey Diagram Maker
Create Sankey diagrams that show flow quantities as proportional band widths. Supports multi-stage flows and interactive visualization.
Treemap Generator
Generate treemaps that represent hierarchical data as proportional rectangles. Visualize budget breakdowns, storage usage, and more.
Radar Chart Generator
Visualize multiple metrics on a radar (spider) chart. Overlay multiple datasets for comparison and analysis.
JavaScript Obfuscator
Obfuscate JavaScript code to protect your source code. Choose from variable renaming, string encryption, and other techniques.
SCSS to CSS Converter
Compile SCSS code into standard CSS. See nesting and variable expansion in real-time.
TypeScript Formatter
Auto-format TypeScript code with consistent indentation and spacing. Prettier-based formatting that handles type annotations and generics correctly.
GraphQL Formatter
Auto-format GraphQL queries and schemas. Includes syntax error detection and customizable indent settings.
YAML Formatter
Auto-format and validate YAML files. Supports multi-document YAML and JSON conversion.
TSV to CSV Converter
Convert between TSV (tab-separated) and CSV (comma-separated) formats. Works seamlessly with copy-paste from Excel.
XML to JSON Converter
Convert XML data to JSON format. Supports flexible attribute handling and auto-detection of repeated elements as arrays.
TOML to JSON Converter
Convert between TOML and JSON formats bidirectionally. Fully supports TOML v1.0 spec including datetime types and inline tables.
Code Syntax Highlighter
Add syntax highlighting to source code and export as HTML. Choose from 100+ languages and popular color themes.
JSONPath Parser
Extract values from JSON data using JSONPath queries. Supports wildcards and filter expressions with real-time evaluation.
XPath Parser
Extract elements from XML or HTML using XPath expressions. Supports matched element highlighting and real-time evaluation.
User-Agent Parser
Parse User-Agent strings to identify browser, OS, and device information. Also detects bots and crawlers automatically.
URL Parser
Break down URLs into protocol, host, path, parameters, and more. Supports query parameter decoding and table display.
MIME Types Reference
Search and look up file extensions and their corresponding MIME types. Includes over 800 types with one-click copy.
Image to PDF Converter
Convert image files to PDF format. Supports combining multiple images and customizing page size settings.
PDF Merger
Merge multiple PDF files into one document. Drag and drop to freely reorder files before combining.
PDF Splitter
Split PDF files by page or custom page ranges. Preview thumbnails to decide exactly where to split.
PDF Compressor
Reduce PDF file size with image optimization. Achieve significant size reduction while maintaining quality.
PDF Page Reorder
Rearrange PDF pages freely by dragging and dropping. Also supports deleting pages and one-click reverse order.
Markdown Table Generator
Create and edit Markdown tables with a visual GUI editor. Supports CSV/TSV paste and column alignment settings.
JSON / CSV Validator
Validate JSON and CSV data syntax and pinpoint errors. Also supports structural validation with JSON Schema.
IP Address Checker
Check your public IP address instantly with one click. Displays both IPv4 and IPv6 with copy functionality.
Converters
Unit, file, and data conversion tools
Length Unit Converter
Convert between 8 length units including meters, kilometers, inches, and miles. All conversion results are displayed simultaneously as you type.
Weight Unit Converter
Convert between 7 weight units including grams, kilograms, pounds, and ounces. All conversion results displayed simultaneously as you type.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin. Compare all three temperature scales in real time.
Area Unit Converter
Convert between 12 area units including square meters, hectares, acres, and more. Also supports Japanese units (tsubo, jō).
Volume Unit Converter
Convert between 12 volume units including liters, gallons, cups, and tablespoons. Real-time conversion for cooking and scientific measurements.
Speed Unit Converter
Convert between 6 speed units: km/h, mph, m/s, knots, Mach, and more. From everyday speeds to the speed of sound.
Data Storage Converter
Convert between 7 data storage units including bytes, KB, MB, GB, and TB. Quickly understand file sizes and storage capacity.
Time Unit Converter
Convert between 8 time units from milliseconds to years. Supports scientific notation for very large or small values.
Angle Unit Converter
Convert between 6 angle units including degrees, radians, and gradians. Perfect for math and physics calculations.
Pressure Unit Converter
Convert between 9 pressure units including Pascal, atm, bar, psi, and mmHg. Useful across science, engineering, and meteorology.
Energy Unit Converter
Convert between 8 energy units including joules, calories, kWh, and BTU. Useful for physics, electrical, and nutrition calculations.
Power Unit Converter
Convert between 7 power units including watts, kilowatts, horsepower, and BTU/h. Supports both mechanical (HP) and metric (PS) horsepower.
Roman Numeral Converter
Convert between Arabic numbers and Roman numerals. Supports values from 1 to 3,999 with a reference table.
Number to Words Converter
Convert numbers to English word representation. Supports decimals and negative numbers — perfect for checks and official documents.
NATO Phonetic Alphabet Converter
Convert text to NATO phonetic alphabet codes. Useful for spelling out words clearly over phone or radio.
Design Tools
CSS generators, color tools, and SVG creation
Color Code Converter
Convert between HEX, RGB, and HSL color codes. Use the color picker and real-time preview for intuitive color selection.
Color Picker
Pick colors intuitively using a color wheel and sliders. Get and copy color codes in HEX, RGB, and HSL formats.
Image Color Extractor
Automatically detect dominant colors from an image and generate a color palette. You can also click anywhere on the image to pick individual colors.
Image Average Color Picker
Calculate the average color of an entire image or a selected area. Useful for choosing color schemes or thumbnail background colors.
CSS Gradient Generator
Visually create CSS gradients with drag controls. Supports linear, radial, and conic gradient types with presets.
CSS Box Shadow Generator
Visually create CSS box-shadow with sliders. Supports multiple shadows and inset shadows.
CSS Border Radius Generator
Generate CSS border-radius with individual corner controls. Includes elliptical radius options and popular shape presets.
CSS Text Shadow Generator
Generate CSS text-shadow with live preview. Stack multiple shadows with neon, emboss, and other presets included.
CSS Triangle Generator
Generate CSS triangles using the border property. Supports all 8 directions with customizable size and color.
CSS Clip Path Generator
Visually create CSS clip-path shapes with drag-and-drop. Includes polygon, circle, ellipse, and presets like star and heart.
CSS Glassmorphism Generator
Create frosted glass UI effects with live preview and CSS output. Fine-tune transparency, blur, border, and shadow settings.
CSS Loader Generator
Choose from multiple CSS loading animations and get the code. Customize color, size, and speed for spinners, dots, bars, and more.
CSS Flexbox Generator
Create Flexbox layouts visually and generate CSS code. Adjust all properties with a built-in cheat sheet.
CSS Cubic Bezier Generator
Visually create CSS animation easing curves. Drag handles and preview animations in real time.
Color Shades Generator
Generate light-to-dark shade variations of any color. Adjust the number of steps and export as Tailwind CSS palette.
Color Mixer
Mix two or more colors at specified ratios to create new colors. Compare results across different color spaces like RGB, HSL, and LAB.
Color Palette Generator
Generate color palettes from a base color using color theory. Includes complementary, analogous, triadic, and more color schemes.
Web Font Preview
Preview web fonts from Google Fonts in real time. Compare multiple fonts while adjusting size and color.
HTML Color Names Reference
Browse all 148 HTML/CSS named colors in one place. Search, preview, and copy HEX codes with ease.
CSS Background Pattern Generator
Generate background patterns using pure CSS. Customize stripes, dots, checks, and more with a visual editor.
CSS Scrollbar Generator
Customize CSS scrollbar design with a visual editor. Adjust color, width, border radius, and copy the code directly.
CSS Gradient Text Generator
Generate CSS code to apply gradients to text. Preview colors, direction, and range adjustments in real time.
CSS Checkbox Generator
Create custom CSS checkboxes with a visual editor. Freely customize animations, colors, and shapes.
CSS Toggle Switch Generator
Create custom CSS toggle switches with a visual editor. Adjust size, color, and animation, then export the code.
SVG Blob Generator
Auto-generate organic blob-shaped SVGs. Adjust randomness and complexity for web design decorations.
SVG Pattern Generator
Generate repeatable SVG tile patterns. Customize pattern type, color, and size, then export the code.
Encoding & Crypto
Base64, URL encoding, hash generation, and encryption tools
Base64 Encoder/Decoder
Encode and decode text in Base64 format. Fully supports UTF-8 characters.
URL Encoder/Decoder
Encode and decode URLs in real time. Supports both encodeURIComponent and encodeURI methods.
HTML Entity Encoder
Convert HTML special characters to entities and back. Supports & < > and numeric character references.
Hash Generator
Generate SHA-1/256/384/512 hash values from text. All algorithms computed in real time as you type.
Password Strength Checker
Check password strength in real-time. Analyzes length, character types, and patterns to provide a score.
Text to Binary Converter
Convert between text and binary representation. Fully supports UTF-8 characters including international text.
Text to Hex Converter
Convert between text and hexadecimal (HEX). Fully supports UTF-8 characters including international text.
Morse Code Translator
Convert text to Morse code and vice versa. Includes audio playback and a Morse code reference chart.
ROT13 Cipher
Encode and decode text using the ROT13 cipher (shift by 13). Also supports custom ROT-N shifts with any offset.
Image to Base64 Converter
Convert images to Base64 encoded strings. Also supports data URI format output for direct embedding in HTML and CSS.
Text to Braille Converter
Convert text into Unicode Braille patterns. Useful for learning Braille or creating decorative text.
Caesar Cipher
Encrypt and decrypt text using the Caesar cipher. Specify the shift value to experience this classical cipher.
Vigenere Cipher
Encrypt and decrypt text using the Vigenere cipher. Experience polyalphabetic encryption with a keyword.
XOR Cipher
Encrypt and decrypt text using XOR operations. Supports multiple output formats including hex and Base64.
Base32 Encoder / Decoder
Encode and decode text or data in Base32 format. Perform RFC 4648 compliant conversions right in your browser.
Unicode Converter
Convert between text and Unicode code points (U+XXXX). Useful for checking code points and entering special characters.
Unicode Escape Converter
Convert between text and Unicode escape sequences (\\uXXXX). Ideal for JSON and JavaScript source code.
Punycode Converter
Convert between internationalized domain names (IDN) and Punycode (xn-- format). Useful for verifying international domains and DNS configuration.
Bcrypt Hash Generator
Generate and verify Bcrypt password hashes. Supports cost factor adjustment and automatic salt generation.
OTP Code Generator
Generate and verify TOTP/HOTP one-time passwords. Outputs QR codes compatible with Google Authenticator.
PIN Code Generator
Generate cryptographically secure random PIN codes. Supports batch generation and exclusion of sequential or repeated digits.
AES Encryption / Decryption
Encrypt and decrypt text using symmetric key algorithms like AES. Supports multiple modes including GCM and CBC.
RSA Key Pair Generator
Generate RSA public and private key pairs in your browser. Select key lengths from 2048 to 4096 bits with PEM format output.
Emoji Encoder / Decoder
Convert between emojis and Unicode code points or HTML entities. Supports ZWJ composite emoji decomposition and skin tone modifiers.
Character Encoding Converter
Convert text between character encodings such as UTF-8, Shift_JIS, and EUC-JP. Includes auto-detection and mojibake (garbled text) repair.
Enigma Machine Simulator
Simulate the WWII Enigma cipher machine in your browser. Faithfully recreates rotor and plugboard settings.
Playfair Cipher
Encrypt digraphs using a 5x5 key matrix with the Playfair cipher. Visualize the encryption process step by step.
Rail Fence Cipher
Rearrange characters in a zigzag pattern with the Rail Fence cipher. Includes pattern visualization and animation.
Atbash Cipher
Substitute letters by reversing the alphabet with the Atbash cipher. Results are displayed in real time as you type.
Passphrase Generator
Generate memorable yet secure passphrases from random word combinations. Supports Diceware method and displays entropy strength.
Fun & Random
Lottery, dice, roulette, and random generation tools
QR Code Generator
Convert URLs, text, and contact info to QR codes. Customizable and instant download.
List Randomizer
Randomly shuffle list items. Useful for drawings, randomized ordering, and more.
Coin Flipper
Flip a coin and get heads or tails. Flip multiple times and view statistics.
Dice Roller
Roll dice and see the results. Supports multiple dice and polyhedral dice.
Random Picker
Randomly pick one or more items from a list. Perfect for raffles, drawings, and random selection.
Team Generator
Randomly divide members into teams. Specify the number of teams or members per team for even distribution.
Spin the Wheel
Spin a customizable wheel to pick a random option. Freely add items and customize colors.
Typing Speed Test
Measure your typing speed (WPM) and accuracy in real time. Practice to improve your score over time.
Ladder Lottery Generator
Create and run a ladder lottery (Amidakuji) online. Customize the number of participants and prize settings.
Bingo Card Generator
Randomly generate bingo cards ready to print. Customize the number of cards and number range.
Random Card Draw
Simulate drawing random cards from a deck. Configure deck size and joker options.
Metronome
An online metronome with adjustable tempo. Switch between time signatures and accents to support your practice.
Calendar Display
View a monthly calendar and check holidays and days of the week. Supports month navigation and holiday display.
Date Formatter
Convert and format dates into various output styles. Supports ISO 8601, US format, European format, and more.
Timezone Converter
Instantly convert times between world time zones. Compare current times across multiple cities at a glance.
Body Surface Area Calculator
Calculate body surface area (BSA) from height and weight. Supports multiple formulas including Du Bois, Mosteller, and more.
Heart Rate Zone Calculator
Calculate target heart rate zones from your age and resting heart rate. Find your optimal zones for fat burn, cardio, and peak performance.
Digital Clock
A full-screen digital clock with 12/24-hour format toggle. Supports seconds display and customizable themes.
Analog Clock
A beautiful analog clock face displaying the current time in real-time. Customizable design with dark mode support.
Flip Clock
A retro flip-style animated clock display. Perfect for decorative displays and presentations.
Binary Clock
A unique clock that displays the current time in binary. Great for learning binary numbers and programming concepts.
Multi Timer
Create and manage multiple timers running simultaneously. Perfect for cooking, workouts, and multitasking time management.
Kitchen Timer
A quick-access kitchen timer for cooking. Preset buttons let you set common times with a single tap.
Maze Generator
Automatically generate mazes to play or print. Choose size and algorithm to adjust difficulty level.
Sudoku Generator
Generate Sudoku puzzles to solve on screen or print. Select difficulty level and toggle solution visibility.
Digital Stamp Maker (Hanko)
Create digital versions of "Hanko" — personal seal stamps used in Japanese business culture instead of signatures. Enter a name, choose shape, font, and color, then export as transparent PNG.
Invoice Generator
Create professional invoices and export as PDF. Set line items, tax rates, and payment details for instant billing.
Color Blindness Test
Check your color vision with Ishihara-style color plate tests. Multiple test formats available with instant results.
Online Ruler
Display a real-size ruler in your browser to measure objects. Screen calibration ensures accuracy on any monitor.
Online Protractor
Measure angles precisely with an online protractor in your browser. Drag to intuitively align and measure angles.
Mouse Tester
Test all mouse buttons, scroll, and click speed. Detect double-clicking issues and measure CPS.
Keyboard Tester
Test all keyboard keys and detect simultaneous key presses. Pressed keys are highlighted on a visual keyboard layout.
Decibel Meter
Measure ambient sound levels in decibels (dB) in real time using your microphone. Records average and peak values with noise level reference.
WiFi QR Code Generator
Generate a QR code from your WiFi SSID and password. Just scan with a phone to share your WiFi connection instantly.
Flash Card Maker
Create flash cards with questions on front and answers on back for study. Supports shuffle mode and CSV import for efficient learning.
Life Grid Visualizer
Visualize your life as a grid of weeks, months, or years. Mark life events and see how much time you have left.
Julian Date Converter
Convert between Julian Date (JD), Modified Julian Date, and Gregorian calendar. Supports high-precision bidirectional conversion including time.
Moon Phase Calculator
Calculate and display the moon's age and phase for any given date. Includes realistic visuals and monthly calendar view.
Birthday Weekday Finder
Find out what day of the week you were born on. Also shows birthday trivia and the weekday of your next birthday.
Age in Days Calculator
Calculate exactly how many days, hours, minutes, and seconds you've been alive. Get notified about milestone days like your 10,000th day.
Meditation Timer
A timer with bell sounds for meditation and mindfulness practice. Set intervals and choose from preset durations.
Presentation Timer
Manage your presentation time with color-coded warnings for remaining time. Supports fullscreen display and section-based time allocation.
Exam Timer
A subject-based timer designed for exam and test time management. Includes presets for standardized tests like SAT and TOEIC.
Child Height Predictor
Predict a child's adult height based on parents' heights. Includes gender-specific formulas and margin of error display.
Blood Type Inheritance Calculator
Calculate possible blood types and probabilities for children based on parents' blood types. Shows ABO genotypes and Rh factor inheritance patterns.
Rock Paper Scissors
Play Rock Paper Scissors against the computer. Track wins, losses, and draws with a real-time scoreboard.
