Paste your text and switch it to Base64 or back, whichever direction you need.
Debugging tokens, building data URIs, or decoding a cryptic string from an API — flip text to Base64 and back without touching a terminal.
Paste your plain text or Base64 string into the input area.
Choose the direction: encode text to Base64, or decode Base64 back.
Read the converted result instantly in the output panel.
Copy it with one click and carry on.
Instant encode and decode with clipboard-ready output, all offline in your browser.
No files involved; paste a string, pick a direction and copy the result.
Encoding adds roughly 33 percent to the length, the normal cost of a text-safe alphabet.
Developers use it for API keys, JSON payloads and small embedded assets.
Encode, adjust, decode; flipping direction is a single click.
Everything runs in the browser, so pasted secrets never travel anywhere.
No. Anyone can reverse it in a second, which makes it great for transport and useless for keeping secrets.
Base64 works in blocks of four characters; padding makes the final block fit, so one or two equals signs at the end are completely normal.
With large files. The size penalty and memory cost grow quickly beyond a few hundred kilobytes, where plain binary transfer is the better route.
Most decoders ignore line breaks and spaces, so both wrapped and single-line strings usually decode cleanly.
The tool works in all modern browsers including Google Chrome, Mozilla Firefox, Microsoft Edge, Safari and Opera. We recommend keeping your browser up to date for the best experience.
Base64 Encoder/Decoder complete