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HTTP Status Codes
Look up what each HTTP response status code means.
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URL Query Builder
Assemble long query strings without escaping mistakes.
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Processed locallyAbout URL Query Builder
Adds and removes query parameters visually and produces the finished URL, percent-encoding values for you.
- 1
It appends parameters to an existing address: any `?` query and `#` fragment in the base are preserved, and new parameters are added one per line (`key=value`, or just `key` for an empty value).
- 2
Encoding is delegated to `URLSearchParams`: spaces become `+` (form encoding) and characters that need it become `%xx` (`/` → `%2F`, `%` → `%25`) — which is also the authoritative answer to "what does the server actually receive".
- 3
Duplicate keys survive: writing the same key twice yields `tag=a&tag=b`, a multi-value parameter, rather than the last line winning.
- 1
Enter the base address
It may contain `?` and `#`; the existing query and fragment are kept and joined correctly.
- 2
One parameter per line
`key=value` per line; you can type `&`, `=` and spaces inside a value — they are escaped for you and cannot break the structure.
- 3
Copy the full URL or just the query
Both outputs are available: the whole URL for sharing, the query string for use inside another request.
Because `URLSearchParams` encodes as `application/x-www-form-urlencoded`, where a space is `+`. The two are equivalent in a query string (both decode back to a space), but if an API demands `%20`, replace the `+` characters in the result.
Just type it: the tool escapes those as `%26` and `%3D`, so the parameter structure stays intact. Building the URL by hand is where you would have to escape them yourself — which is the reason this tool exists.
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