Tools
B64

Base64 Encoder

Output
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Base64 Encoder — Encode to Base64 Online Free

What is Base64 Encoder?

Encode text or binary data to Base64. Safe for URLs, JSON, and email.

Base64 Encoder converts text and binary data into Base64 format. Use it for data URIs, MIME email attachments, API authentication, and embedding binary in JSON. The output uses only safe ASCII characters. UTF-8 text is fully supported. Encoding runs in your browser—no server involvement.

How to Use Base64 Encoder

  1. Paste or type your input into the editor on the left panel.
  2. Results update automatically while you type. You can also press Ctrl+Enter to force a refresh.
  3. View the result in the output panel on the right with full syntax highlighting.
  4. Use Copy or Download to export the result.
  5. Drag and drop .json or .txt files directly into the editor.

Example

Input:

Hello, World!

Output:

SGVsbG8sIFdvcmxkIQ==

Common Use Cases

  • Data URIs
  • API tokens
  • MIME encoding
  • Embed binary in JSON

Base64 vs Plain Text

Chars
A-Z, a-z, 0-9, +, /
Full Unicode
Size
~33% larger
Original
Use
Data URIs, MIME
Direct storage

Common Errors

  • Not encryption
  • Binary data encoding
  • Unicode handling

Why Use Our Base64 Encoder?

  • 100% client-side — your data never leaves your browser. No server processing, no data collection.
  • No sign-up required — start using the tool instantly with no registration or installation.
  • Keyboard shortcuts — press Ctrl+Enter to run, ? for shortcuts list, Ctrl+B to toggle sidebar.
  • Persistent state — your input is automatically saved across sessions using local storage.
  • IDE-style interface — Monaco Editor (the engine behind VS Code) with syntax highlighting and error detection.
  • Multi-format conversion — convert between JSON, XML, CSV, and YAML without switching tools.

Frequently Asked Questions

What is Base64 encoding?

Base64 converts binary data into printable ASCII characters using a 64-character alphabet.

Is Base64 encryption?

No. Base64 is encoding, not encryption. Anyone can decode it.

Does it support UTF-8?

Yes. Multi-byte characters are properly encoded.

Why is the output larger?

Base64 uses 4 characters for every 3 bytes of input, about 33% size increase.

Is it free?

Yes. Free, no sign-up, runs in your browser.

Try Base64 Encoder Now

Paste your data into the editor above for instant processing. Use Ctrl+Enter anytime to re-run quickly.

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