Base64 is a way to turn binary data—images, files, or any sequence of bytes—into plain text. Not encrypted; just represented using only letters, numbers, and a couple of symbols so it can go wherever text is allowed. That’s useful when you need to send or store binary data in a place that only accepts text: embedding a small image in HTML or CSS as a data URI, putting binary in a JSON payload, or passing it through a system that can’t handle raw bytes. An encoder turns bytes into Base64 text; a decoder turns Base64 text back into bytes (or readable text if it was text to begin with).
When do you use it? When you’re building a data URI for an image or font and need to paste the Base64 string. When an API expects a Base64-encoded payload and you have the raw data. When you’re debugging and you’ve got a Base64 string in a log or response and you need to see what’s inside. When you’re learning how encoding works and want to try encode/decode without writing code. One important caveat: Base64 is not encryption. Decoding is straightforward. Don’t use it to hide secrets—use proper encryption for that. Use it for transport and representation, not security.
A good Base64 tool lets you paste text (or sometimes upload a file), then encode to Base64 or decode from Base64. You get the result; you copy it where it’s needed. If the tool runs in the browser and doesn’t send data to a server, whatever you encode or decode stays on your machine. That matters when the content might be sensitive—API keys, tokens, or proprietary data. You want a client-side tool you can trust.
Our Base64 encoder/decoder is free and runs in your browser. Paste your string, choose encode or decode, get the result. No sign-up, no server round-trip. Your data is not sent anywhere. Use it for data URIs, API payloads, or any time you need to flip between raw content and Base64.