Base64 Encode/Decode

Encode or decode Base64 with proper UTF-8 handling.

Informational only; verify critical results independently.

How to use

  1. Paste plain text to encode or a Base64 string to decode.
  2. Choose Encode or Decode; the result updates automatically.
  3. Encoding uses UTF-8 so Unicode and emoji become valid Base64.
  4. Copy the result; use in data URLs, APIs, or config as needed.
  5. Decode to recover the original text; invalid Base64 will show an error.
  6. We don’t store or send your input; all processing is in the browser.

Examples

  • Encode 'Hello, world!' for a data URL or API
  • Decode a Base64 token or config value
  • Encode text with emoji (e.g. 'Test ✓')
  • Encode JSON for embedding in a URL or header
  • Decode a Basic auth string (user:pass encoded)
  • Encode a short script or snippet for safe transfer

FAQ

Binary files?
This tool is for text. For files, use a desktop or command-line Base64 tool.
Why does decode fail?
Input may have extra spaces, wrong alphabet, or be truncated. Paste only the Base64 block.
URL-safe Base64?
We use standard Base64 (+/). If your system expects URL-safe (-_), replace + with - and / with _ after encoding.
Is Base64 encryption?
No. It’s encoding; anyone can decode it. Don’t use it to hide secrets.
Can I encode huge text?
Large input may be slow in the browser; keep to a reasonable size (e.g. under 1 MB).
Where is data processed?
In your browser only; nothing is sent to our servers.

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Last updated: 2025-09-15

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