Query String Parser
Parse URL query strings into readable key-value pairs. Paste any URL with parameters and see each parameter extracted and decoded. Free and private.
What Is a Query String?
A query string is the portion of a URL that follows the ? character. It contains one or more key-value pairs separated by ampersands (&). For example, in ?page=2&sort=date&filter=active, there are three parameters. Query strings pass data between pages, configure API requests, and carry tracking information such as UTM campaign parameters. Special characters within values are percent-encoded (e.g., spaces become %20).
Query String Format
?key1=value1&key2=value2&key3=value3
Each key=value pair is separated by &
How the Query String Parser Works
Paste any URL or raw query string into the input field. The parser splits the string at the ? character, then separates each parameter at & boundaries. Keys and values are automatically URL-decoded so you see the readable text instead of percent-encoded characters. Fragment identifiers (the # portion) are stripped before parsing. The result displays each parameter as a labeled key-value pair you can inspect individually.
Common Use Cases for Query String Parsing
Developers use query string parsing to debug API calls, verify that redirect URLs carry the correct parameters, and inspect UTM tracking tags on marketing links. It is also useful when working with OAuth callback URLs that contain authorization codes, or when troubleshooting pagination and filter parameters in web applications. Instead of manually reading through long encoded URLs, this tool extracts and decodes every parameter instantly so you can spot missing or malformed values at a glance.