Base64 Decoder
Runs entirely in your browser
Decode Base64 back to plain text directly in your browser. Paste your Base64, decode, and copy the result.
What is Base64 Decoder?
Base64 Decoder converts Base64-encoded text back to its original plain text. It's the reverse of Base64 Encoder, useful for reading encoded config values, API tokens or email attachments.
How to use Base64 Decoder
- Paste your Base64 text into the Input box.
- Click Decode.
- Copy the plain text result from the Output box.
Features
- Correctly decodes Unicode text, including accented characters and emoji.
- Clear error message when the input isn't valid Base64.
- 100% client-side — your data never leaves your browser.
Frequently Asked Questions
Is my Base64 uploaded to a server?
No. Base64 Decoder runs entirely in your browser. Your data never leaves your device.
Does this support Unicode text and emoji?
Yes. Decoded bytes are interpreted as UTF-8, so text originally encoded with accented letters, symbols or emoji comes back correctly.
What happens if the Base64 is invalid?
You'll see a clear error message instead of a page crash or garbled output — fix the input and try again.
Can I decode a JWT with this?
You can decode individual Base64 segments, but for a full breakdown of a JWT's header, payload and signature, use the dedicated JWT Decoder.