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Crawl, SEO & site checks

Inspect the public responses that crawlers and sharing services can read. Diagnose broken targets, robots rules, sitemaps and share metadata before making assumptions about indexing. A valid file or a passing preview cannot guarantee rankings or AI citations.

Choose a check

Start with Website Down Checker when a URL fails to answer. Use Broken Link Checker on a page, Robots.txt & Sitemap Checker for discovery rules, and Open Graph Preview for share metadata. Keep advertising authorization in ads.txt and optional AI reading links in llms.txt separate from crawler permissions.

Tools in this collection

  • Website Down Checker

    Runs on server
    • Can't open a site? See whether our server can reach it.
    • Site will not load? See if it is down for everyone.
    • See where the failure happened: DNS, connection or HTTP.
    • Getting errors? Check the status code our server sees.
    • Is it your network? Compare with an outside check.

    Check whether a site is down for everyone or just you, and where a failure happened.

  • Broken Link Checker

    Runs on server
    • Catch dead links and missing page resources before your visitors do.
    • Find links on a page that return 404.
    • Images or scripts missing? See which ones fail.
    • See where on the page each broken link sits.
    • After a migration, check pages for dead links.

    Find broken links, images and scripts on a page, with where each one sits.

  • Open Graph Preview

    Runs on server
    • Make sure a shared link shows the title and image you intended.
    • Shared link shows the wrong image? Check og:image.
    • Preview a link as social, chat and search cards.
    • Missing title or description? See which tags are absent.
    • Changed tags? Check them before you share again.

    Preview a link as social, chat and search cards, and check its Open Graph tags.

    • Check whether your crawler rules block pages you want discovered.
    • Page not indexed? Test whether robots.txt blocks it.
    • See which AI crawlers like GPTBot you block.
    • Validate your sitemap.xml and its URLs.
    • Editing robots.txt? Test URLs before you publish.

    Validate robots.txt and sitemaps, test URLs, and see which AI crawlers are blocked.

    • Check the published list of who is allowed to sell your ad space.
    • Ad revenue dropped? Check your ads.txt is valid.
    • Added an ad network? Check its seller line is listed.
    • Check each seller against the network's sellers.json.
    • Have an app? Validate app-ads.txt too.

    Validate ads.txt or app-ads.txt and check each seller against sellers.json.

    • Give AI tools a starting guide to your site's useful pages.
    • Check whether your site has a valid llms.txt.
    • See what an AI agent reads from your site.
    • Draft an llms.txt from your site's pages.
    • Have an llms-full.txt too? Check it as well.

    Check a site's llms.txt, see what an AI agent reads, or draft one from its pages.