Chrome DevTools

Chrome DevTools is a set of web developer tools built directly into the Google Chrome browser.

Overview
Get started with Google Chrome's built-in web developer tools.
Open Chrome DevTools
All of the ways that you can open Chrome DevTools.
What's new in DevTools
Stay up to date with the latest DevTools changes.
Engineering blog
Learn how the team builds new features in DevTools.
CSS #
- View and change CSS
  Learn how to use Chrome DevTools to view and change a page's CSS.
- CSS features reference
  Discover new workflows for viewing and changing CSS in Chrome DevTools.
- Identify potential CSS improvements
  Identify potential CSS improvements with the CSS Overview panel.
- Inspect animations
  Inspect and modify animations with the Chrome DevTools Animation Inspector.
- Inspect CSS Grid
  Learn how to use Chrome DevTools to view and change a page's CSS.
- Force print preview mode
  Open the Rendering tab and select Emulate CSS media > print.
Get Started With Viewing And Changing The DOM
How to view nodes, search for nodes, edit nodes, reference nodes in the Console, break on node changes, and more.
Console #
- Console overview
  The main uses of the Chrome DevTools Console are logging messages and running JavaScript.
- Log messages in the Console
  Learn how to log messages to the Console.
- Run JavaScript in the Console
  Learn how to run JavaScript in the Console.
- Console features reference
  A comprehensive reference on every feature and behavior related to the Console UI in Chrome DevTools.
- Console API reference
  Use the Console API to write messages to the Console.
- Console Utilities API reference
  A reference of convenience functions available in the Chrome DevTools Console.
- Watch JavaScript values in real-time with Live Expressions
  If you find yourself typing the same JavaScript expressions into the Console repeatedly, try Live Expressions instead.
Find Unused JavaScript And CSS With The Coverage Tab
How to find and analyze unused JavaScript and CSS code in Chrome DevTools.
Network #
- Inspect network activity
  A tutorial on the most popular network-related features in Chrome DevTools.
- Network features reference
  A comprehensive reference of Chrome DevTools Network panel features.
Storage #
- View, edit, and delete cookies
  Learn how to view, edit, and delete a page's HTTP cookies using Chrome DevTools.
- View and edit local storage
  How to view and edit localStorage with the Local Storage pane and the Console.
- View and change IndexedDB data
  How to view and change IndexedDB data with the Application panel and Snippets.
- View and edit session storage
  How to view and edit sessionStorage with the Session Storage pane and the Console.
- View Application Cache Data With Chrome DevTools
  How to view Application Cache data from the Application panel of Chrome DevTools.
- View Web SQL data
  How to view Web SQL data from the Application panel of Chrome DevTools.
- View Cache data
  How to view Cache data from the Application panel of Chrome DevTools.
Find and fix problems with the Issues tab
Use the Issues Tab to find and fix problems with your website.
Run commands in the Command Menu
A guide on how to open the Command Menu, run commands, see other actions, and more.
Mobile simulation #
- Simulate mobile devices with Device Mode
  Use virtual devices in Chrome's Device Mode to build mobile-first websites.
- Override the user agent string
  Open the Network conditions tab, disable Select automatically, and choose from the list or enter a custom string.
- Override geolocation
  Open the Sensors tab and select coordinates from the Geolocation list.
- Simulate device orientation
  Open the Sensors tab and go to the Orientation section.
JavaScript #
- Debug JavaScript
  Learn how to use Chrome DevTools to find and fix JavaScript bugs.
- Pause your code with breakpoints
  Learn about all the ways you can pause your code in Chrome DevTools.
- JavaScript debugging reference
  Discover new debugging workflows in this comprehensive reference of Chrome DevTools debugging features.
- Run Snippets of JavaScript
  Snippets are small scripts that you can author and execute within the Sources panel of Chrome DevTools. You can access and run them from any page. When you run a Snippet, it executes from the context of the currently open page.
- Sources panel overview
  View and edit files, create Snippets, debug JavaScript, and set up Workspaces in the Sources panel of Chrome DevTools.
- Debug background services
  How to debug Background Fetch, Background Sync, Notifications, and Push Messages with Chrome DevTools.
- Ignore Chrome Extension Scripts
  Ignore content scripts from Settings > Ignore List.
- Disable JavaScript
  Open the Command Menu and run the Disable JavaScript command.
Performance #
- Analyze runtime performance
  Learn how to evaluate runtime performance in Chrome DevTools.
- Optimize website speed
  Learn how to use Chrome DevTools to find ways to make your websites load faster.
- Performance features reference
  A reference on all the ways to record and analyze performance in Chrome DevTools.
- Timeline Event Reference
  The timeline events mode displays all events triggered while making a recording. Use the timeline event reference to learn more about each timeline event type.
Accessibility #
- Accessibility features reference
  A comprehensive reference of accessibility features in Chrome DevTools.
- Navigate Chrome DevTools with assistive technology
  A guide on navigating Chrome DevTools using assistive technology like screen readers.
- Track element focus
  Open the Console, create a Live Expression, and set the expression to document.activeElement.
Remote debugging #
- Remote debug Android devices
  Remote debug live content on an Android device from a Windows, Mac, or Linux computer.
- Access local servers
  Host a site on a development machine web server, and then access the content from an Android device.
- Remote debugging WebViews
  Debug WebViews in your native Android apps using Chrome Developer Tools.
Memory #
- Inspect JavaScript ArrayBuffer with the Memory inspector
  Use the Memory inspector to inspect an ArrayBuffer in JavaScript, as well as a WebAssembly.Memory
- Fix memory problems
  Learn how to use Chrome and DevTools to find memory issues that affect page performance, including memory leaks, memory bloat, and frequent garbage collections.
- Memory terminology
  This section describes common terms used in memory analysis, and is applicable to a variety of memory profiling tools for different languages.
- Record heap snapshots
  Learn how to record heap snapshots with the Chrome DevTools heap profiler and find memory leaks.
- How to Use the Allocation Profiler Tool
  Use the allocation profiler tool to find objects that aren't being properly garbage collected, and continue to retain memory.
Record, replay and measure user flows
Record, replay and measure user flows with the Recorder panel.
View and debug media players information
Use the Media Panel to view information and debug the media players per browser tab.
Emulate authenticators and debug WebAuthn
Emulate Authenticators and Debug WebAuthn in Chrome DevTools.
Edit files with Workspaces
Learn how to save changes made within DevTools to disk.
Debug Progressive Web Apps
Use the Application panel to inspect, modify, and debug web app manifests, service workers, and service worker caches.
Understand security issues
Use the Security Panel to make sure that a page is fully protected by HTTPS.
Keyboard shortcuts
The canonical documentation for Chrome DevTools keyboard shortcuts.
View page resources
Organize resources by frame, domain, type, or other criteria.
Customization #
- Customization
  A list of ways you can customize Chrome DevTools.
- Enable dark theme
  How to turn on the dark theme in Chrome DevTools.
- Change placement: undock, dock to bottom, dock to left
  How to move Chrome DevTools to the bottom or left of your viewport, or to a separate window.