Does this handle URL-safe Base64?

Partially — replace `-` → `+` and `_` → `/` first, then decode. A dedicated URL-safe option is on the roadmap.

How is Unicode restored?

The decoded bytes are read as UTF-8 so emoji and non-ASCII characters come back intact.

Why do I get an 'invalid base64' error?

The input contains characters outside the Base64 alphabet, or its length isn't a multiple of 4 (add `=` padding).

Base64 decode

Decode Base64 back to UTF-8 text in your browser. Handles multi-byte characters correctly.

Runs in your browser Instant No signup, no tracking

Base64

Text

About this tool

Decode a Base64 string back to UTF-8 text. Whitespace and line breaks in the input are ignored. Invalid Base64 is rejected with a clear error. Everything runs in your browser — safe for tokens, JWT payloads, and other sensitive strings.

Example

Paste the input on the left and you will get output like this:

Sample Base64

SGVsbG8sIHdvcmxkISDwn5GL

Resulting Text

Hello, world! 👋

How to use Base64 decode

Paste or type your Base64 into the left pane.
The Text appears instantly in the right pane. Conversion runs in your browser — nothing is uploaded.
Copy the result to your clipboard or download it as a file.

FAQ

Does this handle URL-safe Base64?: Partially — replace `-` → `+` and `_` → `/` first, then decode. A dedicated URL-safe option is on the roadmap.
How is Unicode restored?: The decoded bytes are read as UTF-8 so emoji and non-ASCII characters come back intact.
Why do I get an 'invalid base64' error?: The input contains characters outside the Base64 alphabet, or its length isn't a multiple of 4 (add `=` padding).