FREE · NO SIGN-IN REQUIRED

Base64 encoder and decoder

Inspect or transfer encoded text and small files. Simple, private, right in your browser.

Preparing your workspace…

A LITTLE GUIDANCE

How to use this tool

Choose encode or decode, and text or file mode.
Enter text, Base64, or select a file; choose the standard or URL-safe alphabet.
Convert and copy the text or download the exact decoded bytes.

A worked example

UTF-8 text Hello → SGVsbG8= → Hello.

What to know

Text uses UTF-8. Invalid UTF-8 is rejected in text mode; file mode preserves binary bytes. Base64 is an encoding, not encryption. Whitespace in encoded input is ignored.

Supported inputs and limits

Files up to 2 MiB; text input up to 3,000,000 characters.

Where is my data processed?

In your browser. Cloud saving is optional: only the supported inputs, settings or files you explicitly choose are uploaded. Download or save anything you want to keep before closing the page. Read our privacy details.