Base64 Encoder and Decoder

How to use it

1. 1Choose encode or decode with the toggle.
2. 2Paste your text or your Base64 string into the box.
3. 3Switch on URL-safe if the value goes into a URL or a JWT — it swaps plus and slash for hyphen and underscore and drops padding.
4. 4Decoding accepts either alphabet and tolerates missing padding, so you can paste a JWT segment directly.
5. 5If decoding reports invalid UTF-8, the data is binary — an image or an archive — rather than text.

Frequently asked questions

Is Base64 encryption?

No. It is an encoding, fully reversible by anyone, with no key involved. Never use it to protect anything — it exists to move binary data safely through text-only channels.

Why do other Base64 tools break on emoji?

Because they call btoa directly, which only accepts Latin-1 characters and throws on anything above code point 255. This page encodes to UTF-8 bytes first, which is what every server-side implementation does.

What is URL-safe Base64?

A variant using hyphen and underscore instead of plus and slash, usually with the padding removed, so the result can go into a URL or a JWT without further escaping.

Related tools

• URL Encoder and DecoderPercent-encode or decode URLs and query parameters, and break any URL into its parts. Handles the component and full-URL distinction correctly.
• JWT DecoderDecode a JSON Web Token in your browser and read its header, payload and claims. Expiry is checked against your clock. Nothing is ever uploaded.
• SHA Hash GeneratorGenerate SHA-256, SHA-384, SHA-512 or SHA-1 hashes of any text in your browser, using the Web Crypto API. Nothing is uploaded.