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Understanding Google Lighthouse

Google Lighthouse is an automated tool designed by Google to help developers improve the quality of their web pages. It provides a comprehensive report on the performance, accessibility, and search engine optimization of a website, offering actionable insights to enhance user experience.

Whether you’re a seasoned developer or a beginner, understanding Google Lighthouse and its functionalities can significantly impact your website’s performance. Let’s dive into the world of Google Lighthouse and explore how it can help you optimize your website.

What is Google Lighthouse?

Google Lighthouse is an open-source, automated tool for improving the quality of web pages. It can be run against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, SEO and more.

Developed by Google, Lighthouse is designed to help web developers identify and fix common problems that affect a site’s performance and user experience. It provides a detailed report, scoring your site in several key areas and offering specific recommendations for improvement.

How Does Google Lighthouse Work?

Google Lighthouse works by crawling your website and evaluating its performance based on a set of predefined rules or “audits”. These audits cover a wide range of factors, including load times, accessibility, and mobile responsiveness.

Once the audit is complete, Lighthouse generates a report with a score for each category. The higher the score, the better your website is performing in that area. Along with the scores, Lighthouse also provides a list of actionable recommendations to improve your website’s performance.

Why Should You Use Google Lighthouse?

One of the main reasons to use Google Lighthouse is to improve your website’s performance. A faster, more efficient website can lead to higher user engagement, more page views, and improved SEO.

Google Lighthouse also helps ensure your website is accessible to all users, including those with disabilities. By following the recommendations provided by Lighthouse, you can make your website more inclusive and reach a wider audience.

How to Use Google Lighthouse

Using Google Lighthouse is straightforward. You can run it in Chrome DevTools, from the command line, or as a Node module. You can also integrate it into your continuous integration systems to catch regressions.

Let’s look at how to use Google Lighthouse in Chrome DevTools, as it’s the most accessible method for most users.

Running Google Lighthouse in Chrome DevTools

First, open Chrome DevTools on the page you want to audit. Click on the ‘Lighthouse’ tab, then click ‘Generate report’. Lighthouse will run a series of audits against the page and then display a report of the results.

You can use the report to identify areas of your website that need improvement. Each audit has a reference doc explaining why the audit is important and how to fix the failing audits.

Understanding Your Google Lighthouse Score

Once you’ve run an audit with Google Lighthouse, you’ll be presented with a report detailing your website’s performance. This report is broken down into several categories, each with its own score out of 100. The categories include Performance, Accessibility, Best Practices, and SEO.

It’s important to understand that these scores are not absolute. They’re meant to give you a general idea of how well your website is performing in each area. The real value of Google Lighthouse lies in the specific recommendations it provides for improving your website.

Improving Your Google Lighthouse Score

Improving your Google Lighthouse score involves addressing the issues identified in the audit report. This might involve optimizing images, reducing server response times, or improving your website’s accessibility.

Remember, the goal is not to achieve a perfect score, but to create a better experience for your users. Even small improvements can have a big impact on user engagement and SEO.


Google Lighthouse is a powerful tool for improving the quality of your web pages. By providing detailed insights into your website’s performance and offering actionable recommendations, it can help you create a faster, more user-friendly website.

Whether you’re a seasoned developer or just getting started, Google Lighthouse is a valuable addition to your web development toolkit. So why wait? Start using Google Lighthouse today and take your website to the next level.

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