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.
Commands and shortcuts #
- Run commands in the Command Menu
  A guide on how to open the Command Menu, run commands, see other actions, and more.
- Disable JavaScript
  Open the Command Menu and run the Disable JavaScript command.
- Keyboard shortcuts
  The canonical documentation for Chrome DevTools keyboard shortcuts.
Simulate mobile devices with Device Mode
Use virtual devices in Chrome's Device Mode to build mobile-first websites.
Elements #
- 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.
- View and change CSS
  Learn how to use Chrome DevTools to view and change a page's CSS.
- Inspect CSS Grid
  Learn how to use Chrome DevTools to view and change a page's CSS.
- Inspect and Debug CSS Flexbox Layouts
  Learn how to use Chrome DevTools to inspect, modify and debug CSS flexbox layouts.
- CSS features reference
  Discover new workflows for viewing and changing CSS in Chrome DevTools.
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.
- 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.
- Format and style messages in the Console
  Learn how to format and style messages 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.
Sources #
- Sources panel overview
  View and edit files, create Snippets, debug JavaScript, and set up Workspaces in the Sources panel of Chrome DevTools.
- 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.
- 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.
- Edit and save files with Workspaces
  Learn how to save changes made within DevTools to disk.
- JavaScript debugging reference
  Discover new debugging workflows in this comprehensive reference of Chrome DevTools debugging features.
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.
- View page resources
  Organize resources by frame, domain, type, or other criteria.
Performance #
- Analyze runtime performance
  Learn how to evaluate runtime performance in Chrome DevTools.
- 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.
Performance insights: Get actionable insights on your website's performance
Get actionable insights on your website's performance with the Performance insights panel.
Memory #
- Memory terminology
  This section describes common terms used in memory analysis, and is applicable to a variety of memory profiling tools for different languages.
- 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.
- 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.
Application #
- Debug Progressive Web Apps
  Use the Application panel to inspect, modify, and debug web app manifests, service workers, and service worker caches.
- View and edit local storage
  How to view and edit localStorage with the Local Storage pane and the Console.
- View and edit session storage
  How to view and edit sessionStorage with the Session Storage pane and the Console.
- View and change IndexedDB data
  How to view and change IndexedDB data with the Application panel and Snippets.
- View Web SQL data
  How to view Web SQL data from the Application panel of Chrome DevTools.
- View, edit, and delete cookies
  Learn how to view, edit, and delete a page's HTTP cookies using Chrome DevTools.
- View Cache data
  How to view Cache data from the Application panel of Chrome DevTools.
- Test back/forward cache
  Ensure your pages are optimized for back/forward caching.
- Debug background services
  How to debug Background Fetch, Background Sync, Notifications, Push Messages, and view reports with Chrome DevTools.
- Deprecated: View Application Cache Data With Chrome DevTools
  How to view Application Cache data from the Application panel of Chrome DevTools.
Lighthouse: Optimize website speed
Learn how to use Chrome DevTools to find ways to make your websites load faster.
Animations: Inspect and modify CSS animation effects
Inspect and modify animations with the Chrome DevTools Animation Inspector.
Changes: Track your HTML, CSS, and JavaScript changes
Track changes to HTML, CSS, and JavaScript.
Coverage: Find unused JavaScript and CSS
How to find and analyze unused JavaScript and CSS code in Chrome DevTools.
CSS Overview: Identify potential CSS improvements
Identify potential CSS improvements with the CSS Overview panel.
Issues: Find and fix problems
Use the Issues Tab to find and fix problems with your website.
Media: View and debug media players information
Use the Media Panel to view information and debug the media players per browser tab.
Memory Inspector: Inspect JavaScript ArrayBuffer
Use the Memory inspector to inspect an ArrayBuffer in JavaScript, as well as a WebAssembly.Memory
Network conditions: Override the user agent string
Open the Network conditions tab, disable Select automatically, and choose from the list or enter a custom string.
Recorder: Record, replay and measure user flows
Record, replay and measure user flows with the Recorder panel.
Rendering #
- Rendering tab overview
  Discover a collection of options that affect web content rendering.
- Discover issues with rendering performance
  Spot repainting, layout shifts, layers and tiles, scrolling issues, see rendering statistics and Core Web Vitals.
- Emulate CSS media features
  Emulate prefers-color-scheme, media type, forced-colors, prefers-contrast, prefers-reduced-motion, color-gamut.
- Apply other effects: enable automatic dark theme, emulate focus, and more
  Highlight ad frames, emulate focus on a page, disable local fonts and image formats, enable an automatic dark theme, and emulate vision deficiencies.
Security: Understand security issues
Use the Security Panel to make sure that a page is fully protected by HTTPS.
Sensors #
- 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.
WebAuthn: Emulate authenticators
Emulate Authenticators and Debug WebAuthn in Chrome DevTools.
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.
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.
Settings and customization #
- Customize
  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.
- Ignore Chrome Extension Scripts
  Ignore content scripts from Settings > Ignore List.