About the Base64 Decode
Base64-encoded data shows up in JWTs, data URIs, email headers and API payloads. This decoder reverses the encoding and correctly reconstructs UTF-8 text so multi-byte characters render properly.
Decoding is local and private — safe even for tokens and sensitive payloads.
How to use the Base64 Decode
- 1Paste the Base64 string.
- 2Click “Decode Base64”.
- 3Read or copy the decoded text.
Key benefits
- Correct UTF-8 reconstruction.
- Handles padding automatically.
- Private and instant.
Real-world examples
Inspect a data URI
Decode the payload of a base64 data URI.
Read an encoded header
Decode a Base64 email or auth header.
Frequently asked questions
Why does decoding fail?+
The input may contain characters outside the Base64 alphabet or have incorrect padding.