This technical search engine optimization tool audits HTML source snippets and published web pages to identify dead hyperlinks, broken image references, and HTTP 404 response errors. Digital marketers, webmasters, and SEO consultants can parse raw HTML markup or crawl live URLs to protect domain crawl equity and prevent link rot before releasing website updates.

### Link Extraction Engine & Status Categorization The auditing pipeline operates in dual input modes:

- **HTML Source Parsing:** Uses the browser native `DOMParser()` to extract all anchor elements (`<a>`), resolving relative root and document paths against your base domain URL. - **URL Crawl Inspection:** Dispatches page requests through an HTTP validation proxy to inspect target endpoints while bypassing client-side Cross-Origin Resource Sharing (CORS) restrictions. - **Status Health Matrix:** Categorizes every discovered link into structured filter buckets: - *OK (200–299):* Functional endpoints returning valid HTTP success codes. - *Redirects (300–399):* Permanent (301) and temporary (302) redirect chains. - *Broken (400+, Error):* Missing pages (404 Not Found), forbidden endpoints (403), and blocked hostnames. - **Real-Time Search & Filtering:** Filter links by anchor text, destination URL, or status code with instant table updates and CSV export.

### Concrete Audit Example Suppose an SEO specialist pastes an HTML blog archive containing 5 links: - `https://example.com/blog/seo-guide` $\rightarrow$ **200 OK** (Internal) - `https://example.com/legacy-pricing` $\rightarrow$ **301 Moved Permanently** (Internal redirect) - `https://partner.org/broken-page` $\rightarrow$ **404 Not Found** (External broken link) - `https://example.com/about` $\rightarrow$ **200 OK** (Internal)

The audit table flags `partner.org/broken-page` in red, displaying the corresponding anchor text so the editor can replace or prune the dead link immediately.

### Network Privacy & Proxy Transparency HTML markup parsing runs locally in client JavaScript. When checking external HTTP link status, target URLs route through an ephemeral backend proxy solely to verify HTTP status headers without logging page contents or caching session cookies.