Query String Builder
Build URL query strings from key-value pairs. Handles encoding automatically.
Runs entirely in your browser — nothing is uploaded or stored on any server.
About Query String Builder
Updated Jan 2025The Query String Builder lets you construct URL query strings by entering key-value pairs. It automatically URL-encodes values, handles arrays (multiple values for one key), and shows the final URL in real time. Useful for building API request URLs, testing endpoints, and generating links.