Free tools
Free SEO tools
Quick checks for one page or one website at a time, with no sign-up. When you want every page checked, SEOSage crawls the whole site.
Free page check
Title, description, headings, canonical, indexing, images and links for one page.
Robots.txt tester
See if a page is allowed or blocked for Googlebot or another crawler.
Sitemap checker
Find the sitemap, count the URLs and test a sample for errors.
Noindex checker
See if a page is set to noindex and what its canonical tag says.
Redirect chain checker
Follow every redirect hop and spot chains, loops and dead ends.
404 checker
Test the links on a page and list the broken ones.
Meta description checker
Check the title tag and description length, with a search result preview.
Internal link checker
Test the internal links on a page for redirects and errors.
Alt text checker
List the images on a page that have no alt attribute.
Open Graph checker
See which social share tags a page has and which are missing.
Hreflang checker
Test hreflang tags, language codes and return links.
Schema markup validator
Check JSON-LD structured data and the fields Google asks for.
One page is a start
These tools check one page or one file at a time. Real sites have hundreds of pages. SEOSage crawls all of them on your own computer, with no page limit, then lists the problems by how serious they are.