Base64 Decoder

Decode Base64 or Base64URL to text, or to a downloadable file for binary data.

Runs in your browser. Your data and files never leave your device.

About the Base64 Decoder

Paste Base64 (with or without a data: prefix, standard or URL-safe) to decode it. Binary results can be downloaded as a file.

SGVsbG8sIHdvcmxkIQ== decodes to Hello, world!. A string ending in - or _ characters is URL-safe Base64 and decodes the same way.

Why does my decoded text look garbled?

The data is probably binary (an image, PDF or compressed file), not text. Download it as a file instead.

What does ‘invalid Base64’ mean?

The input contains characters outside the Base64 alphabet or has the wrong length. Check for missing characters or extra spaces from copying.