Converter Web ToolsConverter WebTools

Query String Parser

Query String Parser — a fast, free, privacy-friendly online tool that runs entirely in your browser.

Input
Output
Share Link
Settings
Convert

What is Query String?

A Query String Parser is a free online tool that breaks down URL query strings into individual key-value pairs, decoding percent-encoded values and displaying parameters in an easy-to-read format. Query strings are the part of a URL that comes after the ? character and contains parameters separated by ampersands (&), commonly used in web applications for passing data between pages, tracking information, or configuring API requests. This tool instantly extracts and organizes all parameters from any URL or query string, making it essential for developers, marketers, and technical professionals who need to debug URLs, analyze API requests, inspect tracking parameters, or troubleshoot complex URLs without any installation or signup required.

How Query String works

A Query String Parser works by accepting a full URL or just the query string portion, then automatically decomposing it into individual components. The tool identifies the ? delimiter that marks the start of the query string, then splits the parameters at each & character, extracts the key and value from each pair (separated by =), and decodes any URL-encoded characters (like %20 for space) to display human-readable results.

Concrete Example:

Input URL:

https://www.example.com/search?q=cloud%20storage&utm_source=email&utm_campaign=spring2026&limit=10

The tool extracts the query string portion after the ? and produces this output:

q: cloud storage
utm_source: email
utm_campaign: spring2026
limit: 10

Notice that %20 is automatically decoded to a space, and each parameter appears as a separate key-value pair. The tool also recognizes advanced array notation: if the query string contains tags[]=dev&tags[]=ops, it groups these into a single tags parameter with values [dev, ops], making it immediately clear which parameters are array-based.

How to use

  1. Enter your input.
  2. See the result instantly.
  3. Copy or download the output.

Common uses

  • Debug API requests by inspecting which parameters are being sent and their exact decoded values, useful for troubleshooting why API calls fail or return unexpected results
  • Analyze marketing and tracking URLs to see UTM parameters, affiliate codes, and other campaign data embedded by analytics tools
  • Understand URL structure when learning web development or explaining how web applications pass data between pages and systems
  • Verify URL encoding is correct before sharing links, ensuring special characters are properly encoded and parameters will be interpreted correctly
  • Decode and inspect complex query strings from error messages, logs, or intercepted network traffic to identify configuration issues or malformed parameters

Frequently asked questions

What is a query string and where does it appear in a URL?
A query string is the part of a URL that appears after a ? character and contains parameters in key=value format separated by & characters. For example, in https://www.example.com/search?q=query&sort=date, the query string is q=query&sort=date. Every part after the ? is considered the query string.
Why do I need to parse query strings when I can just read the URL?
Query strings often contain URL-encoded characters (like %20 for spaces) that are difficult to read, and complex URLs with many parameters become confusing. A parser automatically decodes these characters and organizes parameters into a clear, structured format that makes the actual data values and structure immediately obvious.
Can this tool parse query strings with special characters or non-English text?
Yes. The tool automatically decodes percent-encoded characters, which includes special characters, spaces, symbols, and non-English Unicode characters. Any character that has been URL-encoded (percent-encoded) will be converted back to its readable form.
Does this tool work with array-style query parameters like tags[]=value&tags[]=value2?
Yes. The tool recognizes array notation in query strings and intelligently groups parameters with the same name but array syntax into a single entry with multiple values, making it clear that this parameter contains a list of items rather than a single value.
Is my data safe when I use this tool to parse query strings?
Completely safe. This is a free, in-browser tool that performs all parsing locally in your browser. Nothing is uploaded to servers, no data is stored, and no personal information is collected. The tool processes your input immediately and displays results only on your device.