Web Tools tools.bryantsmith.com

URL, HTTP & APIs

Query String Builder

Add key/value pairs and get a correctly percent-encoded query string or full URL. Spaces, &, =, unicode and repeated keys are encoded for you. Everything runs in your browser — nothing is sent to a server.

Runs in your browser v1.0.0

Parameters

0 pairs

Leave blank to build only the query string.

Key / value pairs

Encoding & ordering

Press Enter in a key field to move to its value, and in a value field to add the next pair.

Result

0 chars

How it works

Each row becomes one key=value pair, joined with &. Keys and values are encoded with encodeURIComponent() by default, so a space becomes %20 and characters such as &, =, ? and # cannot break the URL. Switch to Form-encoded for application/x-www-form-urlencoded (spaces become +); None outputs raw text for manual assembly. Repeated keys are kept in order, so tags=new&tags=sale works. Rows without a key are ignored, surrounding whitespace is trimmed, and empty values are preserved as key=. Nothing is uploaded, and the current pairs and options can be shared through the URL fragment.

Related tools

  • Query String ParserTurn a URL or query string into an editable table of parameters and rebuild a clean query string — in your browser.
  • HTTP Request BuilderBuild a complete HTTP request from method, URL, query parameters, headers, and body, then copy the raw message or cURL command.
  • UTM BuilderBuild correctly encoded UTM campaign URLs from a destination link and campaign details, entirely in your browser.
  • URL ParserBreak a URL into scheme, authority, hostname, port, path, query, and fragment — entirely in your browser.
  • cURL Command BuilderTurn a method, URL, headers, and body into a ready-to-paste curl command — entirely in your browser.
  • cURL to Fetch ConverterPaste a curl command and instantly get ready-to-paste browser fetch() JavaScript, entirely in your browser.

More URL, HTTP & APIs tools