Free Website Performance Tools

Test, compare and improve your website's speed with free tools that need no account. The tests combine real-user data from the Chrome UX Report with lab tests based on Lighthouse, so you see both how fast your site is for actual visitors and why. The image tools run entirely in your browser; your files are never uploaded.

From the Solo plan

Monitor Core Web Vitals every day

The free tools show one point in time. Monitoring measures your pages and competitors every day and sends an alert when a metric gets worse. Available from the Solo plan.

Core Web Vitals monitoring → Pricing

Test website speed and Core Web Vitals

Website Speed Test

Tests several pages of a site on mobile and desktop and shows real-user data, lab findings and competitors in one report.

Real-user data + lab test No sign-up

Core Web Vitals Test

Checks LCP, INP and CLS of real visitors against Google's thresholds and shows which pages fail and why.

Real-user data + lab test No sign-up

Mobile Website Speed Test

Measures how fast a site loads on phones, with real-user data from mobile Chrome and a throttled lab test.

Real-user data + lab test No sign-up

Compare your site with competitors

Core Web Vitals Benchmark

Puts the real-user Core Web Vitals of up to five sites side by side, with history and the gap to the leader.

Real-user data No sign-up

Check server response and hosting

Hosting Checker

Finds the host, CDN, server country and CMS of a site and places its real-user server response among other sites at the same host.

Real-user data No sign-up

TTFB Test

Shows how long real visitors wait for the first byte of a URL and of the whole origin, from Chrome UX Report data.

Real-user data No sign-up

Compress and convert images in your browser

Image Compressor

Compresses and converts JPG, PNG, WebP and AVIF in bulk, with responsive sizes and srcset code. Images never leave your device.

Runs in your browser No sign-up

Formats: Compress JPEG · Compress PNG · PNG to WebP · JPG to WebP · WebP Converter · AVIF Converter

Plan budgets and estimate impact

Performance Budget Calculator

Turns medians of comparable sites into limits for page weight, scripts and Core Web Vitals, with ready-to-use Lighthouse CI files.

Calculator No sign-up

Site Speed Impact Calculator

Shows the share of slow page loads from real-user data and, with your own numbers, the visits and conversions they affect.

Real-user data No sign-up

Which tool answers which question?

Question	Tool
How fast does my page load, and what slows it down?	Website Speed Test
Does my site pass Google's Core Web Vitals?	Core Web Vitals Test
How fast is my site on phones?	Mobile Website Speed Test
Is my site faster or slower than my competitors?	Core Web Vitals Benchmark
Who hosts this site, and is the host or the setup slow?	Hosting Checker
How quickly does my server respond to real visitors?	TTFB Test
How do I make my images smaller without uploading them?	Image Compressor
What limits should my pages stay within?	Performance Budget Calculator
How many visits does slow loading affect?	Site Speed Impact Calculator

Real-user data and lab tests: what each tool measures

Real-user data, also called field data, comes from the Chrome UX Report: how long actual Chrome visitors waited over the last 28 days. Google uses this data to assess Core Web Vitals. A lab test loads the page once under fixed conditions and shows which resources cost time. Lab scores can look good while real visitors still wait, and the other way round. The badge on each tool shows which kind of data it uses.

Website speed data

Website speed statistics · Core Web Vitals by industry · Core Web Vitals by CMS and platform · Third-party benchmark · Web hosting comparison

FAQ

Are the tools really free?

Yes. Every tool on this page works without an account. Only daily monitoring is paid.

Which tool should I start with?

With the website speed test. It shows real-user data and lab findings in one report and links to the specialised tools that fit.

What is the difference between real-user data and a lab test?

Real-user data shows how long Chrome visitors actually waited over the last 28 days; Google assesses Core Web Vitals on this data. A lab test loads the page once under fixed conditions and shows which resources cost the time.

Why does my site show no real-user data?

The Chrome UX Report only includes sites with enough Chrome traffic. For smaller sites, the lab tests provide the diagnosis.