Query String is a free web & network tool that runs entirely in your browser — parse & build URL query params. No upload, no account, no limits.
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How to use Query String
Open the Query String tool.
Paste or type your URL, header or IP address into the input field.
The output updates as you type — adjust the options if you need a different format.
Copy the result, or share the URL to hand the exact input to someone else.
About Query String
Parse a URL or query string into its individual parameters, decoded and laid out as key/value pairs. Paste a full URL or just the query portion to inspect what's being sent.
What people use it for
Break a long URL's query string into readable parameters.
Decode percent-encoded parameter values.
Audit the tracking or filter params on a link.
Frequently asked questions
Can I paste a full URL?
Yes — it finds the query portion and lists each parameter, decoded.
Is it private?
Every calculation happens on this page, in your own browser. Your input is never sent to a server, never logged and never used for training — which also means the tool keeps working when you are offline.