How to use URL component encoder
Encode or decode a UTF-8 URL component with strict percent-escape validation. The check runs when you submit the form. Its inputs are processed in this browser.
How the check works
Encoding uses encodeURIComponent on one component. Decoding uses decodeURIComponent and rejects malformed escapes and invalid UTF-8 sequences.
The Overview tab explains the findings. Measured data lets you search individual fields and values, while JSON report shows the complete export. Export JSON to retain a baseline, or print the findings for your own records. Review the report before sharing it: browser characteristics, token claims, and file names can reveal information about your setup.
Read the result in context
A component may be a parameter value or path segment. Encoding an entire URL will also encode its separators, which usually changes its intended structure.
Understand the limits
This is not application/x-www-form-urlencoded parsing: a plus sign remains a plus sign on decode. No destination is opened.
Common questions
Where is the input processed?
In this browser tab. This tool does not submit its input to the site server or a third-party service.
What should I keep with a result?
Record the selected options, browser and time. Review exported values before sharing them. Generated passwords, tokens and HMAC secret keys are excluded from report exports.