Base64 Decoder

Base64 Decode Online — Free

Paste in a Base64-encoded string and instantly see the original text or data it represents.

How to Decode Base64

Paste your Base64 string into the box and the decoded result appears immediately. If the input isn't valid Base64, you'll get a clear error rather than a garbled guess.

What You're Actually Undoing

Base64 is a way of representing binary data as plain text — decoding just reverses that, turning the text-safe encoding back into its original form. It's not encryption, so there's no password or key involved; anyone with a valid Base64 string can decode it the same way, which is exactly why it should never be relied on to keep something secret.

Good Uses for This Tool

Reading the actual content of a Base64 string found in an API response, decoding an embedded image or file reference to inspect it, checking what data is hiding inside a Base64-encoded JWT or config value, or reversing an encoding step while debugging.

Is It Actually Private?

Yes. Decoding happens entirely in your browser — nothing you paste is sent to a server.