Base64, URL encoding and JSON come up constantly, and because they all involve turning data into text, they're easy to confuse. They solve different problems, and using the wrong one — or misunderstanding what it protects — causes real bugs. Here's the short version.
Base64: moving binary as text
Base64 re-encodes any data — an image, a file, raw bytes — as plain text made of letters, digits and a couple of symbols. That's useful when a system can only carry text but you need to move binary through it: inlining a small icon into CSS as a data URI, or embedding a file in a JSON payload. The Base64 Encoder does this both ways, including for uploaded files.
The critical thing to remember: Base64 is not encryption. Anyone can decode it instantly. Never use it to hide passwords or secrets — it only changes the shape of data, not its secrecy.
URL encoding: making text safe for links
URLs can't contain spaces and many symbols, so those characters are 'percent-encoded' — a space becomes %20, and so on. You need it whenever you build a link with user input or query parameters. The URL Encoder / Decoder converts text to and from this form, which is also handy for reading tracking or redirect URLs that look like gibberish.
JSON: structured data
JSON is how most APIs exchange structured data. It's not an encoding of bytes — it's a format for objects and lists. The everyday tasks are formatting it so a human can read it, minifying it so a machine can ship it, and validating it when something breaks. The JSON Formatter does all three and points to the exact position of a syntax error.
Common mix-ups
- Treating Base64 as security — it isn't; it's trivially reversible.
- Encoding a whole URL instead of just the values inside it, which double-encodes and breaks links.
- Blaming an API when the real problem is invalid JSON — a trailing comma or a single quote. Validate first.
Keep the distinction simple: Base64 moves binary as text, URL encoding makes text safe for links, and JSON structures data. Each tool runs entirely in your browser, so whatever you paste stays on your device.