Four input modes
Scan a single URL, a sitemap, a file of URLs or piped STDIN.
All projects
Broken Link Finder · Crystal
Deadfinder
Find dead links that quietly hurt SEO and security. Point Deadfinder at a URL, sitemap, file or pipe and get a concurrent, CI-ready broken-link report.
Crystal
170+
MIT
4
Input modes
5
Output formats
170+
GitHub stars
CI
GitHub Action
Capabilities
Broken links, found concurrently
Four input modes, five output formats and a GitHub Action — Deadfinder slots into both manual checks and CI pipelines.
Concurrent workers
Tunable concurrency and timeouts crawl large sites quickly.
Headers and proxy
Custom HTTP headers, user-agent and authenticated proxy support.
Match and filter
Include or exclude links with regex pattern matching.
Coverage and visuals
Track coverage and render a visualization of the crawl.
Pipeline-native output
JSON, YAML, TOML, CSV and SARIF, plus a ready-made GitHub Action.
Quickstart
From a sitemap to a SARIF report
$ brew install deadfinder
# scan a single page
$ deadfinder url https://www.hahwul.com
[*] 1 dead link found (404)
# crawl a sitemap with coverage, write JSON
$ deadfinder sitemap https://www.hahwul.com/sitemap.xml --coverage -o report.json
# pipe a list, filter to api hosts
$ cat urls.txt | deadfinder pipe -m 'api.'
Illustrative output.
Kill your dead links.
Run Deadfinder locally or drop the GitHub Action into CI.