Base64 Encode / Decode

Make sure the mode is set to Encode, then type or paste your text into the input box — the Base64 result appears instantly in the output, ready to copy. Text is read as UTF-8, so emoji and any non-English characters (Cyrillic, Arabic, Chinese, accented letters) are encoded correctly. If you need it for a URL or filename, switch the variant to URL-safe; if you are embedding it in CSS or HTML, tick "Output as a data URI" to get a ready-to-paste data: string.

Switch the mode to Decode and paste your Base64 into the input — the decoded text shows up immediately. Decoding is forgiving: it ignores spaces and line breaks, automatically accepts URL-safe Base64 (with - and _ instead of + and /), copes with missing "=" padding, and strips a leading data: URI prefix for you. If the string isn't valid Base64 you'll get a clear message instead of garbled output.

Standard Base64 uses the characters + and / and pads with =, which can break when the value travels inside a URL, query string, cookie or filename. URL-safe Base64 swaps + for - and / for _ (and often drops the = padding) so the value survives unescaped. Use it for things like JWT segments, OAuth tokens and signed URLs. The decoder here accepts both variants automatically, so you never have to convert one to the other by hand.

Yes. In Encode mode, click "Encode a file" or drop a file onto the input, and the tool reads its bytes and produces the Base64 — turn on "Output as a data URI" to get a complete data:<mime>;base64,… string you can paste straight into an <img src>, CSS background or inline asset. To go the other way, paste a data URI into Decode mode and use Download to rebuild the original file, with the right type and extension detected automatically.

Your data is private — every conversion runs entirely in your browser with JavaScript, so nothing you type or drop is ever uploaded to a server, and the tool keeps working offline once the page has loaded. That said, remember that Base64 is an encoding, not encryption: anyone can decode it back instantly. It's perfect for safely transporting binary data as text, but it provides no security, so never rely on it to protect secrets.