Inspect network activity Network features reference. Simulate mobile devices with Device Mode Override the user agent string Override geolocation Simulate device orientation. Analyze runtime performance Optimize website speed Performance features reference Timeline Event Reference.
Accessibility features reference Navigate Chrome DevTools with assistive technology Track element focus. Customization Enable dark theme Change placement: undock, dock to bottom, dock to left. 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. How to view nodes, search for nodes, edit nodes, reference nodes in the Console, break on node changes, and more. A reference of convenience functions available in the Chrome DevTools Console.
If you find yourself typing the same JavaScript expressions into the Console repeatedly, try Live Expressions instead. A tutorial on the most popular network-related features in Chrome DevTools. A comprehensive reference of Chrome DevTools Network panel features. How to view and edit localStorage with the Local Storage pane and the Console. How to view and edit sessionStorage with the Session Storage pane and the Console.
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.
Use virtual devices in Chrome's Device Mode to build mobile-first websites. Open the Network conditions tab, disable Select automatically, and choose from the list or enter a custom string.
Open the Sensors tab and select coordinates from the Geolocation list. Open the Sensors tab and go to the Orientation section. Learn about all the ways you can pause your code in Chrome DevTools.
Discover new debugging workflows in this comprehensive reference of Chrome DevTools debugging features. 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.
Learn how to evaluate runtime performance in Chrome DevTools. Learn how to use Chrome DevTools to find ways to make your websites load faster. You can edit HTML on the fly and preview the changes by selecting any element, choosing a DOM element within the panel, and double clicking on the opening tag to edit it. The closing tags are automatically updated for you. Any changes will show up in your browser as if the change had actually been made to the source code.
This is probably one of the most common uses for this tool. When debugging JavaScript it is sometimes useful to set breakpoints. The page will then run right to that breakpoint. In the example below we entered to go to line , column Ever have multiple lines you need to add something to? You can also change the Chrome DevTools dock position.
You can either undock into a separate window, or dock it on the left, bottom, or right side of the browser. You can also easily clear cookies from the Chrome DevTools. This can be especially useful when testing and debugging third party plugins.
You can test your website and media queries to see if your responsive design is breaking anywhere by going into device mode. Or perhaps you need to see at what resolution the page is breaking at so you know where to apply a media query. You can then choose what device and resolution to emulate, add a network throttle, and even define the device orientation. The custom color palette will pull from the website style sheet. You can access them by simply clicking on the color block in the style panel.
There is also a color picker that can be used to pick out colors from a web page directly. Have you ever tried to figure out where a hidden style is coming from, say the :hover selector? However, there is something better, called Toggle Element State. This allows you to force an element state, like :hover , so that you can then use the styles panel to see the properties. You can save any image from a webpage out as a data URI or rather base64 encoded.
There is no need to use a free online converter as it is already built into Chrome DevTools. In the Network panel click on an image and then right click on it to have the option to Copy image as data URI.
The network filmstrip feature allows you to see how your page renders from start to finish by grabbing screenshots throughout the loading process. After the page has refreshed it will show you how your page rendered from start to finish. The performance feature allows you to easily see what is costing you the most time and resources.
The performance details can be broken down in many different ways, such as the time, activity, and source. Record the amount of time that you want to be monitored. You can then click Stop and evaluate the results.
We have a great article on blocking the DOM and how to fix it. Checking these values can be beneficial in improving the overall performance of your website or application.
Normally everything that is left of or touching the blue line are assets that are blocking the DOM, or also referred to as render blocking resources. You can now also add custom networking throttling profiles. This can be beneficial if you are wanting to test more accurately at a specific speed.
In the Network panel click the Throttle drop down and then Add
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