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lock Free · Private · In-Browser
Query String Builder
Turn key value rows into a properly encoded query string or full URL.
Build encoded URLs without mistakes
Spaces, ampersands, and special characters can break URLs when query strings are typed by hand. This builder reads simple key value rows, encodes them safely, and appends them to an optional base URL.
Use it for search URLs, filters, testing links, and API debugging where exact parameters matter.
Local URL building
Your URLs stay in your browser.
Frequently Asked Questions
What does this builder create?
It builds a URL query string from key value rows and safely percent-encodes each value.
Can it append to a base URL?
Yes. Enter a base URL and the tool outputs the full URL with the generated query string.
Does it support duplicate keys?
Yes. Repeated keys are kept as repeated query parameters.
Is anything uploaded?
No. Query strings are built locally.
Take it further
UTM Builder
Need campaign links? Use the UTM builder too.