Debug web pages on-the-fly with nine essential debugging tools. This Chrome extension makes debugging any web page a breeze.

Add, modify, or remove HTTP request headers on desired URLs. It helps you test a particular header for a request on a website.
Throttle network speed for all network requests. Choose any URL to slow down, leaving others unaffected. Control delay for desired URL.
Change, and manipulate URL query parameters. It reads and organizes the key, and value pairs on the current web page.
Specify a page that should be automatically redirected to another page. E.g. when you visit page 'A' it'll to redirect to page 'B'
Switch between user-agent strings quickly. Imitate, spoof or simulate other browsers, devices or search engine spiders.
Simulate any web page's experience by injecting your own JavaScript or CSS script in the console.
Add (Access-Control-Allow-Origin: *) rule to the response header and easily perform cross-domain Ajax requests in web applications.
Generate Content Security Policy headers on any website/web page of your choice.
Create your customized rules/configurations for you specific needs. Get started with any of the nine tools you need by filling up simple configuration form without diving in to console.
Add to Chrome
Create your favorite configurations once and use it as and when you need for debugging. No need to go back and forth for your favorite configurations. Use multiple tools at the same time to create your custom debugging environment.
Add to Chrome
We take care of your subtle needs so your can focus on what matters the most. Match LT Debug with your dark mode system setup, get the work done without any strain.
Add to Chrome
TestMu AI also offers a collection of 200+ free online tools, utilities, and libraries to support developers, testers, and designers in their day-to-day tasks. From HTML, XML, and JSON formatters and converters to robust test data generators, everything is available in one place.
Check Free Tools
Test AI agents such as chatbots and voice assistants to ensure efficiency, relevancy, and performance.More about AI Agent Testing

Users
2M+
Tests
1.2B+
Enterprises
10K+
Countries
132
Recognized in Gartner's Magic Quadrant 2025 as a Challenger for strong customer experience.

Featured in Forrester's Autonomous Testing Platforms Landscape, Q3 2025 for innovation in AI-driven testing.

We protect your data and AI systems with global security, privacy, responsible AI, and ESG standards, backed by certifications.

TestMu AI is #1 choice for SMBs and Enterprises across the globe.

TestMu AI forEnterprise
Get access to solutions built on Enterprise
grade security, privacy, & compliance