Base64 Decoder
Decode Base64 strings back into readable text.
When you find a long string of letters, digits, plus signs and equals signs, it's often Base64.
About Base64 Decoder
Paste a Base64-encoded string and instantly decode it back into readable text or a downloadable file, useful for inspecting encoded JWT segments, email attachments, or data URIs during debugging. Decoding happens client-side, so encoded credentials or tokens are never sent anywhere.
When you find a long string of letters, digits, plus signs and equals signs, it's often Base64. This decoder turns Base64 back into readable text, correctly handling UTF-8, so you can inspect encoded config values, token segments, email parts or data URIs during debugging.
How to use Base64 Decoder
- Paste the Base64 string into the input box.
- The decoded text appears immediately.
- If the result is an error, check for missing padding or stray characters.
- Copy the decoded text.
Key features
- Decodes standard Base64 to UTF-8 text.
- Clear error for invalid input.
- Instant results with no button press.
- Runs locally, safe for sensitive strings.
Common use cases
- Reading the payload of an encoded config or header value.
- Inspecting parts of a JWT or email while troubleshooting.
- Checking what's inside a data: URI.