Base64 Encoder / Decoder

Convert plain text to Base64 or decode Base64 back to text, live, in either direction.

Text

Base64

Walkthrough

How to use it

Choose Encode (text → Base64) or Decode (Base64 → text) using the mode buttons.
Type or paste into the left pane.
The right pane updates live with the converted result.
Click Copy to copy the output to your clipboard.

Use cases

When you'd use this

Embedding a small file inline. Base64-encode a small image or font to embed it directly in CSS or HTML as a data URI, avoiding an extra network request.

Decoding a JWT or Basic Auth header. Both use Base64 under the hood — decode a header value here to see what's actually inside it.

Passing binary-safe data through text-only systems. Encode data before putting it in a URL parameter, a JSON field, or an email body where raw bytes aren't safe.

FAQ

Common questions

Is Base64 encryption?

No — Base64 is an encoding, not encryption. It's fully reversible by anyone with no key required, so never rely on it to hide sensitive data.

Does it handle Unicode text correctly?

Yes, this tool encodes using UTF-8 first, so accented characters and emoji round-trip correctly.

What happens if I paste invalid Base64 in Decode mode?

The status line reports that the input isn't valid Base64 rather than showing garbled output.

Is anything I type sent to a server?

No — encoding and decoding use the browser's built-in btoa/atob functions locally.