Base64 Decoder
Paste a Base64 string to convert it back to readable text instantly. Full Unicode support, and your input never leaves your browser.
How to decode Base64
- Paste your Base64 string into the input box.
- The decoder instantly converts it back to the original text.
- If it fails, check for missing characters or incorrect
=padding. - Copy the decoded result with one click.
Decoding is not decryption
Base64 is encoding, not encryption — decoding needs no key and provides no security. Anyone can decode a Base64 string, so it should never be used to protect secrets.
Need to go the other way? Use the Base64 Encoder. Learn more in what is Base64 encoding and Base64 vs encryption.
Frequently Asked Questions
How do I decode a Base64 string?
Paste the Base64 string and the decoder instantly converts it back to the original text. Everything runs in your browser.
Why is my Base64 failing to decode?
Invalid input usually means missing characters, incorrect padding (=), or that the string was not valid Base64 to begin with.
Does it support Unicode and emoji?
Yes. The decoder handles UTF-8, so accented characters, non-Latin scripts, and emoji decode correctly.
Is decoding the same as decryption?
No. Base64 is encoding, not encryption — decoding requires no key and provides no security.
Is my data uploaded to a server?
No. Decoding happens entirely in your browser; your input never leaves your device.
How do I encode text to Base64 instead?
Switch to encode mode (or use the Base64 encoder) to convert plain text into Base64.