Do I need the leading question mark?

No. The tool strips it if present, so you can paste the raw parameters too.

Are values URL-decoded?

Yes. Percent-encoded values such as %20 are turned back into normal characters.

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Turn a ?key=value URL query string into a clean, readable list of parameters. Free, no signup.

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QUERY STRING

PARAMETERS

Do I need the leading question mark?: No. The tool strips it if present, so you can paste the raw parameters too.
Are values URL-decoded?: Yes. Percent-encoded values such as %20 are turned back into normal characters.