How does Base64 affect data size?

Base64 encoding increases data size by approximately 33%. This is because 3 bytes of data are converted into 4 ASCII characters.

Can I encode Japanese text?

Yes, this tool supports UTF-8 encoding, so it can correctly encode and decode any text including Japanese.

What is the difference between Base64 and Base64URL?

Standard Base64 uses "+" and "/", while Base64URL replaces them with "-" and "_". Base64URL is safe for use in URLs and filenames.

Is my data sent to a server?

No, all processing is done in your browser. No data is ever sent externally.

Base64 Encoder/Decoder

Encode and decode text in Base64 format. Fully supports UTF-8 characters.

Text

Base64

Input: 0 bytesOutput: 0 characters

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How to Use

Step 1

Input

Paste text or Base64 string into the input field

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Step 2

Select

Select encode or decode mode

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Step 3

Result

Results appear in real-time, ready to copy

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Features

Real-time Conversion

Conversion results appear as you type

Full UTF-8 Support

Correctly handles Japanese and multibyte characters

Browser Only

Data is never sent to any server

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FAQ

Base64 is an encoding scheme that converts binary data into ASCII strings. It is widely used for email attachments and embedding images in web pages (Data URIs).

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