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Base64 Encoder & Decoder Online — Free Tool

Securely encode plain text into Base64 format, or decode Base64 strings back to their original readable state.

Privacy note: All processing happens entirely in your browser. No data is sent to our servers.

About this tool

Base64 encoding represents binary data as ASCII text using 64 safe characters. Developers use it for embedding small assets in JSON, encoding Basic auth headers, or moving binary through text-only channels.

Paste plain text to encode or paste a Base64 string to decode back to UTF-8 text. The tool runs locally, which is useful when you should not paste sensitive tokens into unknown online services.

Common use cases

  • Decoding JWT or API payload segments for inspection
  • Encoding small snippets for data URIs or tests
  • Verifying encoding round-trips in integration tests

How to use

  1. Paste or type your input in the tool panel above.
  2. Choose formatting or conversion options if available.
  3. Copy the output for use in your document or project.

This page is available at /tools/base64-encoder-decoder/.

Related keywords

  • base64 encoder
  • base64 decoder
  • encode base64
  • decode base64

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FAQ

What is Base64 Encoder & Decoder?

Base64 Encoder & Decoder is an online developer tool that securely encode plain text into Base64 format, or decode Base64 strings back to their original readable state.

How do I use the Base64 Encoder & Decoder?

Paste your code, JSON, token, or query into the editor, run the tool, and copy the formatted or converted result into your project.

Is this tool free?

Yes—this tool is free to use with no account required.

Does it run locally in the browser?

Yes. Calculations and transformations run in your browser—your input stays on your device.