Web
All tools →Query String Builder
Build a URL with query parameters safely. — free, private, client-side. API: POST /api/v1/tools/query-string-builder
Base URL
Params (one per line, key=value)
Runs 100% in your browser — no data leaves your device. For programmatic use:
curl -X POST /api/v1/tools/query-string-builder -d '{ "input": "hello" }' → JSON. See /docs/api.