Build an HTTP or HTTPS URL from a base, JSON query values and a fragment.
Type or paste on the left — the result updates as you type.
Replaces the existing query. Arrays produce repeated parameters; null becomes empty. The URL is constructed without being opened.
Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.
Tool page updated: 2026-09-27
