Free Website health & speed tools

New Checker

Website Technology Checker

See what a website is built with: CMS or builder, ecommerce platform, frameworks, analytics, CDN, web server, DNS host, hosting network and email provider.

Open Checker

HTTP Headers & Compression Checker

Check every HTTP response header a URL sends. Test gzip and Brotli compression, compressed vs original size, caching rules, Vary, HTTP/3 and CDN headers.

Open Checker

Page Speed Checker (Core Web Vitals)

Test any page's speed on mobile and desktop with Google PageSpeed data: scores, LCP, INP and CLS from real users, lab metrics and plain-English fixes.

Open Checker

Broken Link Checker

Find dead links, 404s and broken images on a page and up to 10 pages it links to. See redirects, timeouts and anchor text, then export a CSV.

Open Checker

Redirect Checker

Test the 301 redirects on http, https, www and non-www. See every hop with its status, Location and time, plus 302s, chains, loops and a one-hop verdict.

Open New Tool

Bulk Redirect Checker

Check redirects for up to 100 URLs at once: final URL, status code, every hop, chains, loops and 302s. Upload a redirect map to verify a site migration.

Open Checker

HTTP Status Code Checker

Check the HTTP status code of any URL, follow every redirect hop and see the final response: 200, 301, 302, 404, 410, 500 and more.

Open Checker

Website Down Checker

Check whether a website is down for everyone or just you. See the HTTP status, response time and whether DNS and HTTPS are working.

Open Tool

Image Compressor

Compress JPG, PNG and WebP images in your browser. Set quality and max width, convert to WebP, batch up to 20 and download as ZIP. Nothing is uploaded.

Also in Images & design Open Tool

HTML, CSS & JavaScript Minifier

Minify CSS, HTML, JavaScript and JSON in your browser. See original and minified size, the percentage saved and an estimated gzip size. Nothing is uploaded.

Also in Developer Open