What is W3C-checklink?
W3C-checklink crawls websites to validate links and anchors, checking for broken links, redirects, and link conformance to web standards. Agent Analytics can track when it visits your website.
Overview
| Operated By | W3C |
| Source | Official Website |
| Expected To Follow Robots.txt | No |
| Insights Last Updated | July 31, 2026 |
Do you operate this agent? Contact us to suggest an update.
Category
Expected Behavior
W3C-checklink's traffic is as regular as a cron job, because it usually is one. Uptime monitors hit the same endpoint every few minutes, while performance and audit tools run deeper scans on demand. Expect narrow, repetitive access to specific pages rather than crawling.
W3C-checklink's User Agent
| User Agent | W3C-checklink/5.0.0 |
How To Block W3C-checklink With Robots.txt
Add this rule to your robots.txt file to request that W3C-checklink not access your website, or use Automatic Robots.txt to request the same of all developer helpers at once. You can customize which pages are blocked by swapping out / for a different path.
User-agent: W3C-checklink # https://knownagents.com/agents/w3c-checklink
Disallow: /Global Insights for W3C-checklink
As of July 31, 2026, this data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the world's top 1000 websites and their robots.txt files.
Robots.txt Blocked Percentage
Country of Origin
Robots.txt Blocking Trend
0% of top websites block W3C-checklink in their robots.txt files.
Overall Developer Helper Traffic
0.3% of all web traffic came from developer helpers.
Frequently Asked Questions
Should I Block W3C-checklink?
Only if nobody you work with uses it. W3C-checklink is the kind of tool a team points at its own site for uptime checks, performance tests, and audits. If someone on your team relies on it, blocking it silently breaks their monitoring. Almost none of the top websites we track have robots.txt rules for W3C-checklink right now.
Does W3C-checklink Follow Robots.txt Rules?
No. W3C-checklink is not expected to follow robots.txt rules, so a disallow rule only states your preference. Enforce the block with firewall or server rules, then confirm in Agent Analytics that its requests actually stop.
Does W3C-checklink Access Private Content?
Only if its owner sets that up. Monitoring tools check whatever they are configured to check, which can include staging sites and private health endpoints when a team grants access. Uninvited, W3C-checklink sees only public pages.
Why Is W3C-checklink Visiting My Website?
Someone pointed W3C-checklink at your site, most likely your own team. Uptime monitors, performance testers, and audit tools only visit the sites they are configured to watch.
How Can I Tell if W3C-checklink Is Visiting My Website?
Agent Analytics tracks W3C-checklink visits in real time alongside every other known AI agent, crawler, and scraper. You can also check your server logs for requests whose user agent string contains "W3C-checklink". Look for regular checks of the same pages or endpoints, often minutes apart. Keep in mind that W3C-checklink doesn't publish a verification method, so any client can claim its user agent string and a log match is a hint rather than proof.