Free Page Speed Test With Google Lighthouse
Test any page with Google Lighthouse on mobile or desktop. Get your 4 scores, the speed metrics, a screenshot, real-user data when Google has it, and the top fixes sorted by time saved.
- What it doesRuns a Google Lighthouse speed test
- AccuracyAs accurate as Google Lighthouse
- Works withAny public URL, mobile or desktop
- PriceFree, no sign-up, no limit
- Last reviewed
What Is a Page Speed Test?
Slow pages lose visitors. People leave when a page takes too long to show, and speed is part of Google’s page experience signals. A lab test like this one is great for finding exactly what slows a page down, like large images or heavy scripts. Where Google has it, the tool also shows real-user data, so you can compare the lab test with what visitors feel.
- Powered by Google Lighthouse
- Mobile and desktop tests
- Performance, Accessibility, Best Practices and SEO scores
- Real-user data when Google has it
- Top fixes sorted by time saved
How to Use the PageSpeed Checker
Enter a page URL
Pick mobile or desktop
Run the test
Read the scores
Fix the top issues
Quick speed wins
- Compress images and use WebP or AVIF.
- Set width and height on images.
- Lazy-load images below the fold.
- Remove unused JavaScript and plugins.
- Use caching and a CDN.
- Preload your main font and hero image.
Lighthouse Scores Explained
| Score | Measures | Good |
|---|---|---|
| Performance | Loading speed in a lab test | 90 to 100 |
| Accessibility | How usable the page is for everyone | 90 to 100 |
| Best Practices | Security and modern web standards | 90 to 100 |
| SEO | Basic search engine checks | 90 to 100 |
Scores of 50 to 89 need improvement, and 0 to 49 are poor.
How the PageSpeed Checker Works
- 01
You enter a URL
You pick mobile or desktop.
In your browser - 02
Google runs Lighthouse
Our server calls Google's PageSpeed Insights API, which loads the page in Lighthouse on Google's servers.
Google, via our server - 03
Metrics are measured
FCP, LCP, TBT, CLS and Speed Index are recorded in a throttled test.
Google - 04
Real-user data is added
If Google has Chrome UX Report data for the page, it is shown next to the lab test.
Google - 05
Fixes are sorted
Opportunities are sorted by the time they could save, biggest first.
In your browser
Lab Data vs Field Data
Lab data (Lighthouse) is one test in a fixed setup. It is great for finding causes and testing fixes, but scores can change a few points between runs.
Field data (Chrome UX Report) is what real visitors felt over 28 days. Google uses field data for its Core Web Vitals. Use our Core Web Vitals Checker for a full field data view.
Is the PageSpeed Checker Accurate?
- Scores match the PageSpeed Insights API
- Mobile and desktop tests both work
- Real-user data shows when available
- Fixes are sorted by time saved
- Errors from Google are shown clearly
Accuracy in plain words
Lighthouse scores can change by a few points from one run to the next because of network and server timing. Run the test 2 or 3 times and look at the trend, not one number.
Features of the PageSpeed Checker
Google Lighthouse
The same engine as PageSpeed Insights.
Mobile and desktop
Test both device types.
4 scores
Performance, Accessibility, Best Practices and SEO.
Real-user data
Field data when Google has it.
Screenshot
See the page as the test loaded it.
Top fixes
Biggest time savers first.
Limitations of This Tool
- It does not fix speed problems for you
- Scores can vary a few points between runs
- It cannot test pages behind a login
- It tests one page at a time
- Run the test 2 or 3 times
- Fix the biggest time savers first
- Check real-user data with our Core Web Vitals Checker
- Re-test after every change
Who Can Use This PageSpeed Checker?
Developers
Find the exact files that slow a page.
SEO specialists
Add speed to every audit.
WordPress owners
See which plugins and images slow your site.
Store owners
Speed up product pages to sell more.
Updates, Bug Fixes and Reviews
PageSpeed Checker launched
First release with Lighthouse on mobile and desktop, 4 scores, metrics, screenshot, real-user data and sorted fixes.
Full re-test and rules review
We run the tool against our test cases again and check Google Lighthouse and PageSpeed Insights documentation for changes.
Tool page last reviewed on .
Found a bug or a wrong result?
Tell us what you entered, what happened and what you expected. Our developer checks every report, fixes confirmed bugs as a high priority and tests the fix before it goes live.
Who Built and Reviewed This Tool
Hassan
Muhammad Ahtesham
Afza
Sources we follow
Our standards
This page follows our Editorial Policy and Methodology. If something here is wrong, our Corrections Policy explains how we fix it. Learn more about the SpellMistake team.
Ratings From Real Users
No ratings yet. Be the first to rate this tool.
Rate this tool
How useful was the PageSpeed Checker for you?
Ratings come from real visitors. One rating per person. We never add, edit or remove ratings.
PageSpeed Checker FAQ
What is a good page speed score?
A Lighthouse Performance score of 90 to 100 is good, 50 to 89 needs work, and under 50 is poor.
Is this page speed test free?
Yes. It is 100% free, with no sign-up.
Why is my mobile score lower than desktop?
Mobile tests use a slower phone CPU and network, like a typical phone. Most pages score lower on mobile.
Why does my score change every time?
Lab tests are affected by server and network timing. Small changes of a few points are normal.
Does page speed affect SEO?
Yes. Speed is part of Google's page experience signals, and faster pages keep more visitors.
Is this the same as Google PageSpeed Insights?
Yes. The tool uses Google's PageSpeed Insights API, so the scores come from the same Lighthouse engine.
What should I fix first?
Start with the top fixes in the list, they save the most time. Images and unused JavaScript are the most common causes.