Base64 Encoder & Decoder

Base64 represents binary data using 64 printable ASCII characters (A to Z, a to z, 0 to 9, plus and slash). It lets you carry bytes safely through channels that only expect text, such as data URIs, email, JSON, and cookies.

Many Base64 tools call the browser btoa function directly, which only handles Latin1 and throws on characters like é or an emoji. This tool encodes your text to UTF-8 bytes first, so any Unicode character round-trips exactly.

URL-safe Base64 swaps the plus and slash characters for dash and underscore and drops the trailing equals padding, so the result can sit inside a URL or a JWT without extra escaping. Turn on the URL-safe option when encoding to produce it.

Yes. Paste the Base64 or a full data URI and switch to Decode. When the bytes are a file rather than text, the tool recognises common types such as PNG, JPEG, GIF, WebP, PDF and ZIP, previews images, and gives you a download button. To go the other way, use Encode a file instead to turn any file up to 5 MB into Base64 or a data URI.

No. Base64 is a reversible encoding, not a cipher. Anyone can decode it, so it provides no secrecy on its own. Use it to transport data, and use real encryption when you need to protect it.

No. Encoding and decoding happen entirely in your browser, so nothing you paste leaves your device. It is safe to use with tokens, keys, and other private data.