Build a proper URL-encoded query string from a JSON object — and parse one back — on your device.
JSON in
Query string out
Parses a URL or query string into JSON (repeated keys become arrays) and builds one back, URL-encoding values. Runs in your browser.
Runs in your browser. Files are never uploaded — you can go offline after the page loads.
Drop files, pick options, download. Whole folders at once, no signup, no daily limit.
The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.
Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.
Turn a JSON object into a correctly URL-encoded query string ready to append to a link: arrays become repeated keys (the form servers expect), and every value is percent-encoded so spaces and symbols travel safely. Handy for building tracking links, API requests and prefilled forms.
The reverse — query string to JSON — is one click, and it all runs in your browser. To encode a single value, use URL encode / decode.
A JSON array under a key becomes that key repeated for each value (tag=pdf&tag=image) — the standard form web servers expect.
No — everything runs in your browser.
Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.
InfyTool is built by the same team as these free libraries.