Broken links tax your site quietly: dead internal paths leak authority, visitors hit walls at trust-critical moments, and crawlers waste patience on corpses. Whether you're cleaning house or prospecting for broken-link-building opportunities, the best tools to find broken links on websites range from instant browser extensions to full crawlers mapping every dead URL across a domain.
The picks below are organized by job size — one page, one site, or the whole web — because the fastest tool for checking a single landing page is precisely the wrong tool for auditing an ecommerce catalog.
Quick Answer: Use Check My Links for instant per-page scanning, Screaming Frog for complete site crawls with source mapping, Ahrefs or Semrush to find broken links pointing at any domain including competitors', and W3C Link Checker for quick free sweeps without installing anything.
Three Jobs, Three Tool Classes
Checking a single page before publish
Check My Links, a Chrome extension, highlights every link on the current page in seconds — green for live, red for broken. It's the editor's favorite pre-publication pass: no setup, no server access, no excuses.
Auditing your entire site
Screaming Frog SEO Spider crawls the whole domain, collects every 4xx and 5xx response, and — the crucial part — shows which pages link to each broken URL. That inlink data turns a list of dead addresses into a concrete fix list. Free up to 500 URLs; database mode handles much larger sites.
Dead Link Checker and the W3C Link Checker cover the no-install middle ground: paste a URL, receive a report. Adequate for small sites and periodic spot checks, though slower and far less configurable than a real crawler.
Prospecting across the wider web
Ahrefs reports broken outbound links on any site plus — the outreach goldmine — dead pages on other websites that still carry backlinks, ready for pitch-your-replacement campaigns. Semrush Site Audit performs the equivalent for domains you control, with issue grouping and scheduled recrawls.
Comparison
| Tool | Best For | Free Option |
|---|---|---|
| Check My Links | Instant single-page scans in-browser | Yes |
| Screaming Frog | Full-site crawls with inlink source mapping | Yes, 500 URLs |
| Ahrefs | Broken backlink prospecting for outreach | Limited |
| Semrush | Scheduled audits with tracked fixes | Limited |
| W3C Link Checker | Free no-install sweeps of small sites | Yes |
| Dead Link Checker | Quick periodic checks without setup | Yes, limited |
A Cleanup Workflow That Sticks
- Crawl the site and export all client-error URLs together with their linking pages.
- Fix at the source: update or remove the linking text — redirecting every dead URL is a bandage that accumulates hops over time.
- Preserve equity where it exists: 301 genuinely valuable dead URLs once, straight to their best replacement, never through chains.
- Work the other direction too: export broken inbound links from Ahrefs and reclaim the ones worth redirecting to living pages.
- Schedule recurring crawls — link rot returns on schedule whether you check or not.
A Note on Aggressive Uses
Broken-link building — finding dead resources on other sites and pitching your content as the replacement — is legitimate and widely practiced. The gray-area variant mass-automates pitches with barely relevant replacements; expect dismal response rates and lingering reputational residue among webmasters who compare notes. Scale politely or don't scale at all.
Key Takeaways
- Match tool to scope: extension for a page, crawler for a site, backlink index for the web.
- Always repair broken links at their source pages rather than relying solely on redirects.
- Dead pages carrying backlinks are free authority — reclaim them or replace them.
- Link rot is recurring maintenance; calendar it like backups.