Convert text or files to Base64 or decode from Base64 back to plain text. Files are read in your browser, not uploaded.
Imagine needing to send a photo or file through a channel that only understands plain text — kind of like trying to explain a painting using only words. Thats where Base64 comes to the rescue. It turns binary data (like images, audio, or other files) into plain old text using only 64 readable characters: letters, numbers, plus and slash. It's basically the translator between the digital and the human-readable world.
You'll often see Base64 encoding quietly working behind the scenes when emails have attachments, images appear directly in HTML or CSS using data URIs, or when binary content needs to sneak through JSON or XML files without breaking anything. Sure, the resulting text is about 33% bigger than the original data, but it gets the job done — safely, cleanly, and without upsetting text-only systems.
Because it makes your life easier. Our Base64 Encoder/Decoder runs entirely in your browser, meaning your data never leaves your computer — not even for a coffee break. Just paste in your text, or pick a file and it is read straight off your disk by the browser - never sent anywhere - and watch the magic happen instantly. No delays, no downloads, no drama.
Whether you're a developer embedding images in CSS, fiddling with API payloads, or just trying to decode that mysterious string you found online, this tool gives you instant results and peace of mind. Plus, with features like real-time character counting, clipboard copying, and support for files up to 5MB, it's like having a digital Swiss army knife for Base64 jobs.
No manual required. Just pick what you want to do — encode or decode — and drop in your text or file. The result shows up instantly, and if you like what you see, one click gets it copied to your clipboard. Easy.
If you're decoding, just make sure your input ends with an = or two (that's how Base64 says "I'm done"). If you hit an error, double-check that your string doesn't have any rogue characters sneaking in. And when you're decoding files — especially the bigger ones — downloading the output is smarter than copying it.
One tiny heads-up: while the tool handles a lot, anything over 5MB might make your browser sweat a bit. But for everything else? It's fast, friendly, and pretty foolproof.
No. It is an encoding, not a cipher. Anyone can decode it in a second, so it hides nothing. It exists to make data survive being sent as plain text.
Base64 works in blocks of three bytes. When the last block is short, equals signs pad it out, so you see one or two of them at the end.
Yes, as long as the string is valid. Switch to decode and paste it in. A string containing characters outside the Base64 alphabet will be rejected rather than half-decoded.
Base64 spends four characters on every three bytes, so the result is about a third larger. That size is the price of making binary data safe to move as text.
Email attachments, images embedded directly in HTML or CSS as data URIs, tokens and credentials in APIs, and anywhere binary content has to pass through something that only handles text.
You can encode a file, but keep it small. A large file becomes an extremely long string, and it is a third bigger than the file was to begin with.