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W3C Link Checker

validator.w3.org/checklink SEO & Web Analytics Online toolFreeOpen source

W3C’s web link checker for inspecting links and anchors in supplied pages.

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About W3C Link Checker

The W3C Link Checker inspects a web page, a CSS style sheet, or an entire website for problems in links, anchors, and referenced objects. It can check a single document or crawl a whole site recursively.

The W3C recommends first confirming that the pages being checked use valid (X)HTML and CSS, since this gives the best results. The tool is part of the W3C's suite of validators and Quality Web tools. The homepage lists it as free and open source.

Key features

  • Checks links in a single web page
  • Checks anchors within a web page
  • Checks referenced objects in a web page
  • Checks links and references in a CSS style sheet
  • Recursively checks links across a whole website
Best for: People who want to find broken links, anchors, or referenced objects in a web page, style sheet, or website.
Good for
  • Free to use, according to the listed pricing
  • Open source
  • Part of the W3C's established validator and Quality Web tools
Watch out for
  • The W3C recommends validating HTML and CSS first, because results are best when the checked documents use valid markup

W3C Link Checker at a glance

Type
Online tool
Pricing
Free
Open source
Yes
Last checked
Oct 9, 2026 · Online when checked
Listed
Oct 9, 2026

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W3C Link Checker FAQ

Can the Link Checker check an entire website?
Yes. It can check links, anchors, and referenced objects recursively across a whole Web site.
Does a page need valid HTML and CSS before it is checked?
It is not required, but the W3C recommends first ensuring that the documents use valid (X)HTML markup and CSS for best results.
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Listing maintained by Chris McClure and the WebIndexly editors · Updated Oct 13, 2026 · How we rank