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Query parameter inspector
Paste a full URL to break it into editable parameters, then rebuild it.
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Frequently asked questions
What's the difference between the two encode modes?
encodeURIComponent escapes all reserved characters (& ? = / etc.), for encoding a single value. encodeURI keeps URL-structure characters intact, for encoding a whole URL. The checkbox switches between them.
Why does decode turn + into a space?
In application/x-www-form-urlencoded data (query strings from forms), spaces are encoded as +. The decoder converts + back to a space so form values read correctly.
Can I edit query parameters?
Yes. Paste a full URL into the inspector and it breaks out each parameter into editable fields. Change, add or remove them and the rebuilt, correctly-encoded URL updates live.
Is anything sent to a server?
No. All encoding, decoding and URL parsing happens in your browser with native JavaScript. Nothing is transmitted.
Encode vs. encode-component
- Encode as component (encodeURIComponent) escapes everything that isn't safe inside a single query value — including
& ? = / :. Use it when you're building one parameter value. - Unchecked (encodeURI) preserves the URL structure characters, so it's for encoding a whole URL while keeping it a valid URL.
- Decoding also converts
+back to a space, matching how form data is typically encoded. - The parameter inspector splits a URL into editable key/value pairs and rebuilds a correctly-encoded URL as you edit — handy for tweaking tracking params or API queries.