Free URL Encoder/Decoder Online
Encode & Decode URLs Instantly
A free online URL encoder and decoder that converts text, query strings and full URLs to and from percent-encoded (%XX) format instantly — right in your browser. Nothing ever leaves your device.
Enter text or a URL below
Result 0 characters
Why use StudyHelpAI's URL Encoder/Decoder
Free Online URL Encoder and Decoder
Looking for a fast URL encoder decoder online? This free tool converts text, query strings, and full URLs to and from percent-encoded (%XX) format in one click — useful for Computer Science students learning how URLs handle special characters, and for developers debugging query strings or API requests.
Unlike most online URL encoder tools, this one runs entirely using your browser's native JavaScript encoding functions — nothing is uploaded to a server, so it's safe to encode or decode URLs containing real parameters or tokens.
As a completely free URL decoder (and encoder), there's no signup and no daily limit — paste your text, pick a mode, and get the result instantly as you type.
← Explore more free developer toolsFrequently Asked Questions
Yes — this tool is completely free to use, with no signup and no daily limit. Encode or decode as much text as you like.
No. This tool runs entirely in your browser using JavaScript's built-in encoding functions — your text is never sent to a server. That makes it safe to encode or decode URLs containing real tokens, parameters or IDs.
Component mode encodes every special character, including / ? & = : — use it for a single value like a search term or a query parameter's value. Full URL mode leaves those structural characters alone since they're needed to keep an entire URL working — use it when encoding a whole link.
URLs can't contain literal spaces, so they're percent-encoded as %20. Some systems use + for spaces specifically inside query strings — this tool uses the standard %20 form, which works correctly everywhere.
You'll see a clear error message. This usually means the text contains a stray "%" that isn't followed by two valid hex digits — check for a % symbol that wasn't meant to be part of an encoded sequence.
Yes — click "Swap & re-run" to move the output back into the input box and automatically switch to the opposite mode, so you can round-trip a value without retyping it.