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What Is Base64 Encoding?

DevToolDock Team

What is Base64?

Base64 is a way to represent binary data as ASCII text. It uses 64 characters (A–Z, a–z, 0–9, plus two symbols) so data can be safely sent in JSON, XML, or URLs.

When to use Base64

  • Embedding images in HTML or CSS (data URLs)
  • Storing binary data in JSON or APIs
  • Including attachments in email or API payloads

Encode or decode in the browser with our Base64 Encoder and Base64 Decoder. All processing is client-side—no data is sent to a server.

Base64 Encoder

Encode text to Base64. Runs in your browser.

Output will appear here.

What is Base64 Encoder?

This Base64 Encoder helps developers encode text into Base64 for transport and embedding. Base64 is commonly used for data URLs, headers, and API payloads where only ASCII text is safe.

FAQ

Is this tool free to use?

Yes. This tool is available to use for free.

Does the tool run in the browser?

Yes. The logic runs client-side in your browser.

Is my data uploaded to a server?

No. Your input stays in your browser and is not uploaded by this tool.

Can I use this tool for large files?

It depends on your device and browser. Very large inputs may be slow; for huge files, use a local CLI tool.

Example usage

Input

Hello world

Output

SGVsbG8gd29ybGQ=

How to use

  1. Paste text into the input field
  2. Blur the field or keep typing (output updates automatically)
  3. Copy the Base64 output

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