Broken links make your readers unhappy! They make search engines pretty grumpy too, and can cause your search engine rankings to drop if left unattended.
This is a pretty low priority though - so while we'd recommend it as a housekeeping exercise every 2-4 months, there are better places to spend your day-to-day energy.
We recommend:
A note on link checking tools and our security tools: We practise rate limiting -- if a bot hits our server too fast, it'll trigger a captcha notice. This protects you from all sorts of malicious attacks but can cause false positives with the tools above (except Moz and Deepcrawl, which are normally smart enough not to get rate limited). If you see a lot of false positives, or if the tool stops working, it isn't a problem with your site, it's your testing tool acting like an attacker -- and our security systems block against that.
What can you do? We may be able to whitelist the tool. Find out the IP range the tool uses and send it to Support.
Most tools allow you to slow down the rate at which the tool scans. If you have been blocked, try halving the resource use by scanning fewer links per second or increasing the time between crawls.
There's a WordPress plugin called "Broken Link Checker" that does a similar job. The only problem is that it hobbles your website speed, expands your database tables, and runs riot with our caching systems. It's also one of the number-one crashed tables we see on larger sites. That means your database will slow right down or stop responding altogether.
WE DO NOT RECOMMEND BROKEN LINK CHECKER ON OUR SERVERS. Please don't run it on your site.
Please avoid "the WP Broken Link Status Checker" plugin too, for the same reason.
The most common issue is 404 errors. We have a write up on 404 errors and how to address them here.
We deal with the other common errors and how to address them here.
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