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Base64 and URL Codec Workbench
Encode/decode bytes and text with explicit modes.
- 1Enter input
- 2Set options
- 3Get results
This calculator runs in your browser. Nothing is sent to a server.
Text to encode, or Base64/URL text to decode. Decoded output is never executed.
Invalid Base64 fails instead of being repaired.
How it works
- Paste text or Base64.
- Choose encode or decode and the codec.
- Process. Decoded bytes are never executed.
Input stays in this tab. No upload.
Invalid padding is an error, not a guessed repair.
Supported inputs and outputs
UTF-8 text and Base64/Base64url.
Example
encode 'ok' → b2s=.
Questions and answers
Is decoded HTML opened?
No. Output is text/bytes only.
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