Query string builder
About this tool
Build name-and-value query parameters without editing URLs by hand. Optionally start from a base page URL, add rows of parameters, and copy a safely encoded result for documentation, APIs, or campaigns.
Query string builder
Assemble key/value parameters without hand-editing URLs.
How it works
Three quick steps — then download or copy. Each tool page includes tips and FAQs.
Add a base URL (optional)
Paste a destination page, or leave it empty to get just the query string.
Add keys and values
Enter each parameter once. Empty keys are ignored, and values are encoded safely.
Copy the result
Use the finished URL in campaigns, documentation, or the shortener.
Frequently asked questions
How is this different from the UTM builder?
The UTM builder focuses on utm_* fields. This tool accepts any parameter keys you need.
Are values encoded?
Yes. Encoding uses URLSearchParams, so reserved characters are handled correctly.
Is this tool free?
Yes. It is free to use in your browser, with no sign-up.
Is my data uploaded to your servers?
No. This tool runs entirely in your browser, and your input stays on your device.
Can I leave the base URL empty?
Yes. You get a standalone query string starting with ? that you can append elsewhere.