DevTools are the web developer tools built into Chrome on computers. To open them, right-click anything on a page and choose Inspect, or press Ctrl+Shift+I on Windows and Linux or Cmd+Option+I on a Mac (Google’s DevTools docs).
Start here: DevTools for beginners · Inspect an element · Network panel · Debug JavaScript
Getting Started
- DevTools basics: The main panels and what they are for.
- View page source: See the HTML behind a page.
- Chrome for developers: Features for building websites.
- Edit files from DevTools: Workspaces and local file editing.
Performance
- Performance profiling: Record a profile and find what is slow.
- Performance insights: Page load analysis.
- Lighthouse audits: Performance, SEO and accessibility reports.
Debugging
- Debug CSS: Styles, Grid and Flexbox.
- Debug service workers: Lifecycle, fetch and offline testing.
- CORS errors: Find why a cross-origin request is blocked.
- Storage and IndexedDB: Inspect and clear site storage.
- WebSocket errors: Debug real-time connections.
- WebRTC problems: Debug audio and video calls.
- WebGL problems: When 3D graphics will not draw.
Devices and Accessibility
- Device emulation: Test a page at phone and tablet sizes.
- Screenshots from DevTools: Capture full pages and single elements.
- Accessibility checks: Contrast, ARIA and vision simulations.
Flags, Internal Pages and Extensions
- Chrome’s internal pages: The chrome:// pages and what each is for.
- Chrome flags: Turn on experimental features.
- Experimental features: More experiments and how to undo them.
- Beta, Dev and Canary: Test upcoming Chrome versions.
- Extensions for developers: Inspecting pages and testing APIs.
- Load an unpacked extension: Developer mode, for testing your own.
More Guides
- Troubleshooting: fixes for errors, crashes and slow Chrome
- Features: how to use what is built into Chrome
- Extensions: finding, installing and fixing extensions
- Comparisons: Chrome next to other browsers
- Privacy and security: settings that protect your data and accounts
- All guides: every page on this site, in one list