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All ToolsEncode / Decode Base64
Encode / Decode Base64
Encode plain text to Base64 or decode Base64 back to text. Handles Unicode and special characters.
What is Encode / Decode Base64?
Encode/Decode Base64 is a free online tool that encodes plain text to Base64 format or decodes Base64 back to readable text. Base64 is used throughout web development — in data URIs, JWT tokens, HTTP Basic authentication, and email attachments.
How It Works
Encoding uses the browser's btoa() function (with UTF-8 support via TextEncoder for Unicode). Decoding uses atob(). Both run entirely client-side. Unicode characters outside Latin-1 are handled by percent-encoding before the btoa call.
Key Benefits
- Encode or decode with a single click
- Handles Unicode and special characters correctly
- Shows clear error messages for invalid Base64 input
- Copy output instantly
- No data leaves your browser
Frequently Asked Questions
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