A bulk URL checker is an indispensable tool for webmasters and SEOs managing large-scale websites, allowing them to audit hundreds or thousands of URLs simultaneously. Instead of checking pages one by one, you upload a list of URLs, and the tool processes them in parallel, typically returning key metrics for each. These metrics include HTTP status codes, response times, page titles, meta descriptions, canonical tags, and sometimes even alerts for broken links or redirect chains. The efficiency gained is monumental for tasks like monitoring site health after a migration, checking for widespread 404 errors, ensuring consistent HTTPS implementation, or validating that canonical tags are present site-wide.