--- title: Generate Critical CSS description: This Critical CSS generator removes render blocking resources. Improve the speed, conversion rate and Pagespeed Insights score of any website. source_url: html: https://testingbot.com/free-online-tools/critical-css-generator md: https://testingbot.com/free-online-tools/critical-css-generator.md --- [Tools](https://testingbot.com/free-online-tools)Page Speed # Critical CSS Generator Boost your page load speed instantly Critical CSS is the CSS required to render the above-the-fold content. By preloading this CSS before the larger CSS file, your webpage will load faster. Improve your performance score and Core Web Vitals like First Contentful Paint (FCP). This in turn improves customer satisfaction and SEO scores for your website. Enter URL: Wait time (ms): In case you need to wait longer for Javascript or animations Viewport dimensions: 800x600 1024x768 1280x800 1280x960 1280x1024 1440x900 1680x1050 1600x1200 1920x1200 1920x1080 2560x1440 ![Generating CSS](https://testingbot.com/assets/loading-0406eae1b17f4903931d9817122fdfbe585651d8fb63e564cf9def4c609fb9f7.gif) Output: /\* Critical CSS will appear here \*/ This Critical CSS generator reduces render-blocking resources, minimizes bandwidth usage, and ensures faster perceived load times. The result is quicker page rendering and improved performance, vital for retaining visitors and boosting conversions. The generator is simple to use. You can use it for each of the webpages that you would like to optimize. Once added, your Pagespeed Insight metrics will improve drastically. ## Why should I use a Critical CSS Generator? CSS stylesheets block the rendering of pages. Pages might remain blank until the browser completes requesting, downloading, and parsing all stylesheets. To boost rendering of pages, minimizing the CSS load is crucial. Manually identifying critical CSS can be laborious. This generator streamlines the process by automating the identification of essential CSS. From an SEO perspective, quicker page loading times are crucial for search engine rankings. Google's algorithm prioritizes fast-loading websites, considering them more user-friendly. By optimizing Critical CSS, you create a streamlined browsing experience, signaling search engines that your site is responsive and valuable. Improved pagespeed contributes to lower bounce rates, longer user sessions, and ultimately, a positive impact on your SEO efforts. ## How do I add the Critical CSS generated to my webpage? Once you've generated the critical CSS for your page, you can add it to our webpage. See the example below on how to do this. ```html

Hello, world!

``` In the above example, you would put your critical CSS in the head section of the DOM. The other css files will appear in the body, which means they will be loaded later in the webpage lifecycle. By loading the critical CSS in the head of the page, all DOM elements located before the large css files will use the critical CSS at the start of the webpage rendering process. ## Does this work for mobile websites as well? If you have a responsive website, generating the critical CSS with our tool will also work on mobile devices. You will notice improved pagespeed scores on mobile devices. ## Does this tool remove unused CSS? It will not remove unused CSS. This tool will check your webpage and see what CSS is required to display the above the fold content of your page. This CSS can be added to the page before the other (larger) CSS file, resulting in faster rendering of your webpages. ### All Tools #### Accessibility - [Color Contrast Checker](https://testingbot.com/free-online-tools/color-contrast-checker) #### Calculator - [Test Effort Estimator](https://testingbot.com/free-online-tools/test-effort-estimator) - [Test Coverage Calculator](https://testingbot.com/free-online-tools/test-coverage-calculator) #### Converter - [Unix Timestamp Converter](https://testingbot.com/free-online-tools/unix-timestamp-converter) #### Formatter - [Puppeteer to Playwright Converter](https://testingbot.com/free-online-tools/puppeteer-to-playwright-converter) - [JSON Prettifier](https://testingbot.com/free-online-tools/json-prettify) - [HTML Escaper](https://testingbot.com/free-online-tools/html-escape) - [XML Prettifier](https://testingbot.com/free-online-tools/xml-prettify) - [Remove Whitespace](https://testingbot.com/free-online-tools/remove-all-whitespace) - [Text to One Line](https://testingbot.com/free-online-tools/text-to-one-line) - [PX to REM Converter](https://testingbot.com/free-online-tools/px-to-rem-converter) - [CSS Prettifier](https://testingbot.com/free-online-tools/css-prettify) #### Generator - [Random Avatar Generator](https://testingbot.com/free-online-tools/free-avatar-generator) - [Placeholder Image Generator](https://testingbot.com/free-online-tools/placeholder-image-generator) - [Random Address Generator](https://testingbot.com/free-online-tools/random-address-generator) - [Credit Card Generator](https://testingbot.com/free-online-tools/credit-card-number-generator) - [Random Number Generator](https://testingbot.com/free-online-tools/random-number-generator) - [JWT Parser](https://testingbot.com/free-online-tools/jwt-parser) - [Fake Person Generator](https://testingbot.com/free-online-tools/fake-person-generator) - [Hash Text](https://testingbot.com/free-online-tools/hash-text) - [Lorem Ipsum Generator](https://testingbot.com/free-online-tools/lorem-ipsum-generator) - [Random IP Generator](https://testingbot.com/free-online-tools/random-ip-generator) - [Random GUID Generator](https://testingbot.com/free-online-tools/random-guid-generator) - [Character Count](https://testingbot.com/free-online-tools/character-count) - [ASCII to Binary](https://testingbot.com/free-online-tools/ascii-to-binary) - [Random Color Generator](https://testingbot.com/free-online-tools/random-color-generator) - [Open Graph Meta Generator](https://testingbot.com/free-online-tools/og-meta-generator) - [QR Code Generator](https://testingbot.com/free-online-tools/qr-code-generator) - [Device Information](https://testingbot.com/free-online-tools/device-information) - [User Agent Parser](https://testingbot.com/free-online-tools/user-agent-parser) - [Image Extractor](https://testingbot.com/free-online-tools/image-extractor) - [Test Plan Generator](https://testingbot.com/free-online-tools/test-plan-generator) #### Network - [CORS Tester](https://testingbot.com/free-online-tools/cors-tester) - [My GPS Location](https://testingbot.com/free-online-tools/my-gps-location) - [What's My IP Address](https://testingbot.com/free-online-tools/whats-my-ip-address) - [IP Subnet Calculator](https://testingbot.com/free-online-tools/ip-subnet-calculator) #### Scheduler - [Cron Expression Generator](https://testingbot.com/free-online-tools/cron-expression-generator) #### Testing - [XPath & CSS Selector Tester](https://testingbot.com/free-online-tools/xpath-css-selector-tester) [View all tools](https://testingbot.com/free-online-tools)