Base64 Decoder_
Decode Base64 back to readable text. Runs entirely in your browser — nothing you paste here is uploaded or logged.
100% client-side — nothing you enter leaves your browser. Free, no signup, no tracking.
How to use
- 01Paste the Base64 string — standard or URL-safe alphabet, with or without
=padding; whitespace and line breaks are stripped automatically. - 02The decoded text appears live. Decoding errors point at the problem instead of producing garbage.
- 03Copy the result. If the payload is binary rather than text (a decoded image, for example), you get a hex dump of the raw bytes.
About this Base64 decode tool
What Base64 decode does: it reverses Base64 encoding, turning the 64-character alphabet back into the original bytes, then reads those bytes as UTF-8 text. It is encoding, not encryption — decoding needs no key, and Base64 offers zero secrecy. In Python you would call base64.b64decode, in JavaScript atob; here you just paste the string.
Is it safe to decode Base64 online? Here, yes — decoding runs entirely in your browser, so tokens and payloads never reach a server. If the decoded bytes aren’t valid text (Base64 often wraps binary data like images), the tool shows a hex dump rather than mojibake. Need the other direction? Use the Base64 encoder.