What does the URL Encode do?
URL encoding (percent-encoding) replaces reserved characters so they can travel safely in a query string or path. This tool wraps encodeURIComponent and decodeURIComponent.
URL Encode / Decode
Percent-encode query strings, paths and fragments. Nothing is uploaded.
The URL encoder percent-encodes per UTF-8 byte, so é (2 bytes) becomes %C3%A9 (6 characters); only letters, digits and the four unreserved marks - _ . ~ always pass through unchanged.
How does the URL Encode work?
Encode maps characters such as spaces and ampersands to % sequences. Decode reverses them. Both functions run locally.
Does this upload my data?
No. This page never sends your input to a server — formatting, decoding and hashing all run in this tab, on this device.How that works.
Frequently asked questions
Encode vs encodeURI?
This tool uses encodeURIComponent, which also encodes ?, &, and =. That is the right choice for query values, not for a full URL you want to keep as a URL.
Why did decode fail?
A lone % or a truncated escape sequence is invalid. Check the string for incomplete %HH groups.
Does plus become space?
Not here. application/x-www-form-urlencoded treats + as space; this tool follows JavaScript's decodeURIComponent, which does not.
Is input uploaded?
No.
Do one job
Guides
Related tools
JWT DecoderInspect header and payload of a JSON Web Token locally.Base64Convert text to Base64 and back without uploading.HTML EntitiesEscape text for HTML and decode entities back to text.Query ↔ JSONTurn URL query strings into JSON and back.
Browse allencoding toolsor thefull tool directory.