Base64 Decoder
Decode Base64 back into readable text.
Runs entirely in your browser — your data is never uploaded to any server.
How it works
- Paste your Base64Standard or URL-safe, padded or not.
- Decode itThe original text is recovered.
- Copy the resultOr download it as a text file.
What this tool does
- Accepts standard and URL-safe alphabets automatically
- Tolerates missing padding and embedded line breaks
- Correct UTF-8 decoding for all languages
- Clear message when the input is not valid Base64
Frequently Asked Questions
The input was probably encoded binary — an image or compressed file — rather than text. Only text decodes into something readable.
No. Missing = padding is added automatically before decoding.
You can decode individual segments, but the JWT Decoder splits the header, payload and signature for you.
No, decoding runs locally.
Privacy and security
Your input is processed by JavaScript running inside your browser. Nothing you paste is sent over the network, logged, or stored — which is what makes this safe to use with production data. If you want to check this yourself: open your browser’s developer tools, switch to the Network tab, and use the tool — you will see no request carrying your file or input leave the page.