Broken Link Pattern Finder
Detect likely-broken URLs in your content
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Broken link pattern finder
How to use this tool
- 1
Paste HTML
Or list of URLs.
- 2
See suspicious links
Pattern-based flagging.
- 3
Fix before deploy
404s kill SEO + UX.
Frequently Asked Questions
Why pattern-based?
True 404 checking needs live HTTP requests (blocked by CORS in browsers). This flags patterns that are almost always broken: localhost, placeholder URLs, undefined paths.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.