Broken Link Checker
Check the links in pasted HTML or a pasted list of URLs for broken-looking patterns, duplicates and bad formats. A local, basic estimator only. Free, fast and private.
Honest note: this is a local, basic estimator. It checks only the links you paste here for bad formats, empty targets, duplicates and suspicious patterns. It cannot crawl the live web, cannot follow links on a live site, and cannot query Google, so it cannot confirm whether a live link returns a 404.
How to use Broken Link Checker
- Paste your page HTML, or a list of URLs with one URL per line.
- Click Check Links to see format, duplicate and broken-pattern results.
- Fix the flagged links in your source page and re-check.
Local, basic estimator: checks only the links you paste, for format and pattern problems. It cannot crawl the live web or confirm live 404 status.
Frequently Asked Questions
Is this tool free?
Yes, it is 100% free with no sign-up. Your data stays in your browser.
Do I need to install anything?
No. It works in any modern browser on phone, tablet or computer.
Is my data uploaded?
No. This tool runs entirely in your browser and your input is never uploaded to a server.
Can this tool crawl my whole website?
No. It only checks the links you paste here. It cannot crawl a live site or follow links across pages, because browsers block cross-site crawling (CORS). For a full crawl, use a server-side crawler or Google Search Console.