Once installed, the plugin will begin parsing your posts, bookmarks (AKA blogroll), etc and looking for links. Depending on the size of your site this can take a few minutes or even several hours. When parsing is complete the plugin will start checking each link to see if it works. Again, how long this takes depends on how big your site is and how many links there are. You can monitor the progress and set various link checking options in Settings -> Link Checker.
Note : Currently the plugin only runs when you have at least one tab of the Dashboard open. Cron support will likely be added in a later version.
This plugin will monitor your blog looking for broken links and let you know if any are found.
Monitors links in your posts, pages, comments, the blogroll, and custom fields (optional).
Detects links that don’t work, missing images and redirects.
Notifies you either via the Dashboard or by email.
Makes broken links display differently in posts (optional).
Prevents search engines from following broken links (optional).
You can search and filter links by URL, anchor text and so on.
Links can be edited directly from the plugin’s page, without manually updating each post.
The broken links, if any are found, will show up in a new tab of WP admin panel – Tools -> Broken Links. A notification will also appear in the “Broken Link Checker” widget on the Dashboard. To save display space, you can keep the widget closed and configure it to expand automatically when problematic links are detected.
The “Broken Links” tab will by default display broken links that have been detected so far. However, you can use the subnavigation links on that page to view redirects or see a listing of all links – working or not – instead.
Broken Link Checker WORDPRESS PLUGIN