What is a query string in a URL?

A query string is the part of a URL after the ? character. It contains one or more key-value pairs separated by & — for example, ?page=2&limit=20&sort=name. Query strings pass data to web servers or APIs without changing the URL path.

Why are some parameter values percent-encoded?

URL characters are restricted to a safe set. Special characters like spaces, &, =, and non-ASCII characters must be percent-encoded (e.g., space becomes %20) to be valid in a URL. This tool automatically decodes them so you can read the actual values clearly.

Can it handle duplicate parameter keys?

Yes. Some APIs and frameworks use duplicate keys for arrays — e.g., tag=javascript&tag=python. The tool correctly parses and displays all values for duplicate keys rather than overwriting them.

Can I edit a URL's query parameters without touching the path?

Yes. The tool separates the URL into base and query string parts. Editing the query parameters table modifies only the query string, leaving the protocol, host, and path unchanged.

Is my URL data kept private?

Yes. All parsing runs in your browser. URLs containing API keys, auth tokens, or personal identifiers are never transmitted to any server.

All Tools›Debug & API›

Query Param Parser

Free · No Server

Decode and edit URL query strings — live table, JSON export, curl format.

URL or Query String

What is Query Param Parser?

The URL Query Parameter Parser on AiTechWorlds extracts and displays all query parameters from any URL in a clean, editable table. URLs with complex query strings — common in API endpoints, tracking URLs, OAuth callbacks, and analytics links — are almost unreadable in raw form. Identifying individual parameter names and values requires manual string parsing. This tool does it instantly: paste any URL and all query parameters appear as key-value pairs. You can edit values, add new parameters, remove existing ones, and see the reconstructed URL update in real time. The tool also decodes percent-encoded values so you can read them clearly, and handles array parameters and duplicate keys correctly. All parsing runs in your browser — URLs containing API keys, tokens, or PII are never sent to any server. AiTechWorlds built this for developers and analysts who work with complex URLs daily.

How to Use

1
Paste your URL
Paste any URL — including those with long or complex query strings — into the input field.
2
Inspect parameters
All query parameters appear in a table with decoded key and value columns.
3
Edit values
Click any value cell to edit it. The reconstructed URL updates automatically.
4
Add or remove params
Add new key-value rows or delete existing parameters and see the URL update.
5
Copy the URL
Copy the modified URL with all changes applied from the output field.

Common Use Cases

Backend developers inspecting API request URLs with complex query strings during debugging
Frontend developers extracting OAuth callback parameters from redirect URLs
SEO analysts inspecting UTM tracking parameters in marketing URLs
QA engineers modifying individual query parameters to test API edge cases
Data analysts decoding percent-encoded parameter values in analytics URLs

Key Features

Extracts all query parameters into an editable key-value table
Automatically decodes percent-encoded values
Handles array parameters (key[]=val1&key[]=val2)
Edit, add, and remove parameters with real-time URL reconstruction
Preserves URL base and fragment
100% browser-based — URL never sent to any server
Copy modified URL to clipboard

🔒

100% Private — No Server Required

All processing happens directly in your browser. No data is uploaded, stored, or transmitted to any server.

Frequently Asked Questions

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AiTechWorlds

What is Query Param Parser?

How to Use

Paste your URL

Paste any URL — including those with long or complex query strings — into the input field.

Inspect parameters

All query parameters appear in a table with decoded key and value columns.

Edit values

Click any value cell to edit it. The reconstructed URL updates automatically.

Add or remove params

Add new key-value rows or delete existing parameters and see the URL update.

Copy the URL

Copy the modified URL with all changes applied from the output field.

Common Use Cases

Backend developers inspecting API request URLs with complex query strings during debugging

Frontend developers extracting OAuth callback parameters from redirect URLs

SEO analysts inspecting UTM tracking parameters in marketing URLs

QA engineers modifying individual query parameters to test API edge cases

Data analysts decoding percent-encoded parameter values in analytics URLs

Key Features

Extracts all query parameters into an editable key-value table

Automatically decodes percent-encoded values

Handles array parameters (key[]=val1&key[]=val2)

Edit, add, and remove parameters with real-time URL reconstruction

Preserves URL base and fragment

100% browser-based — URL never sent to any server

Copy modified URL to clipboard