Broken link checker
Enter a page URL and we’ll check every link on it for broken (404) or unreachable destinations — so you can fix them before they cost you rankings and trust.
Check broken links across the whole site.
This tool checks one page. atlookup crawls every page and flags broken internal and external links site-wide, with the exact location of each. Free to start.
Why broken links matter
Broken links (links that return a 404 or fail to load) frustrate visitors, waste crawl budget, and leak the authority you’ve built. A page full of dead links signals neglect to both users and search engines. Finding and fixing them is one of the quickest SEO and UX wins available.
How this checker works
Enter a page URL. We fetch the page, collect every link in its HTML, and request each one to see whether it responds successfully. Links that return a 404, 5xx, time out, or can’t be reached are flagged as broken so you can update or remove them.
Notes & limits
- We check the links found in the page’s raw HTML (links added by JavaScript may not appear).
- Free use is capped at 10 checks per day and 50 links per page to keep the tool fast and fair.
- Only public pages can be checked. Everything is rate-limited and abuse-protected.