Reason #1 (in your control) – If you change the URL of an existing page or decide to delete it completely from your server, your visitor will get a 404 or “File Not Found” error when they try to access that page.
Reason #2 (not in your control) – You page URL is abc.com/xyz and another site decided to link to your page but they mistakenly used a wrong URL (say abc.com/xyy) – if anyone visits your page through the other site, they’ll see a 404.
Track all the Missing Pages on your Site
It is extremely important that you get your 404 errors fixed as soon as you spot them because they not only spoil the visitor experience but your site is also losing Google juice. You get juice from every incoming link to your site but the benefit is lost if that link is pointing to a non-existent page.Let me now share the various tools that I use to track track 404 error pages on my site.
The only issue with the Google Analytics approach is that it can artificially inflate the actually pageviews of your site though by a very small number.
My next favorite service is LinkPatch – they have a version that is free for tracking one domain. LinkPatch is purely for tracking 404 errors – you just to have add a line of code to your 404 template* and it will send you instant emails as soon as it discovers any 404 page on your site.
While LinkPatch and Google Analytics will get you the information you are looking for, there’s one obvious downside – both these services require you to add some JavaScript code to your template’s 404 page and they’ll therefore not work with blog sites hosted on Blogger, WordPress.com, etc.
In that case, I recommend using the very-awesome Google Webmaster tools. Go to Dashboard –> Diagnostics –> Crawl Errors and select the “Not found” option.
[*] WordPress users can add the tracking code to either their 404.php file or anywhere in the template through the function is_404().
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