Meta-WebIndexer is a bot in the link preview bots category, operated by Meta.
The Meta-WebIndexer crawler navigates the web to improve Meta AI search result quality for users. In doing so, Meta analyzes online content to enhance the relevance and accuracy of Meta AI.
Link preview bots fetch a page when someone shares its URL in a chat app or social network, to build the preview card. Blocking them breaks your link previews, so keep them allowed but leave them out of analytics and ad requests.
Sample user agent strings sent by Meta-WebIndexer:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-webindexer/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-webindexer/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 (compatible; meta-webindexer/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.0 (compatible; meta-webindexer/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:147.0) Gecko/20100101 Firefox/147.0 (compatible; meta-webindexer/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.0 (compatible; meta-webindexer/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler))Anyone can copy a user agent string. Transfon Security also checks where each request comes from, so a request that claims to be a known crawler but comes from the wrong network is treated as a fake, not as the real crawler.
Share of Meta-WebIndexer requests to sites protected by Transfon Security in the 7 days to 27 October 2026.
| United States | 99% |
| Facebook, Inc. AS32934 | 98% |
We have not confirmed whether Meta-WebIndexer follows robots.txt. Add a rule, then check your logs to see that it stopped. robots.txt is a plain text file at the root of your domain, such as https://example.com/robots.txt.
User-agent: meta-webindexer Disallow: /
User-agent: meta-webindexer Disallow: /private/ Disallow: /search
User-agent: meta-webindexer Allow: /blog/ Disallow: /
User-agent: meta-webindexer Allow: / User-agent: * Disallow: /
User-agent: meta-webindexer group, Meta-WebIndexer ignores your User-agent: * rules, so repeat any that should still apply.meta-webindexer from Meta-WebIndexer's user agent; check Meta's own documentation if it publishes a different robots.txt name.Treat robots.txt as a statement of your policy, and enforce it where requests arrive.
Meta-WebIndexer fetches pages when your links are shared or syndicated. Keep it allowed so previews and feeds work, but leave it out of page views and ad requests.
Transfon Security for publishersWhen ads or posts are shared, Meta-WebIndexer fetches the landing page. Those hits are not clicks, so keep them out of campaign reports.
Transfon Security for advertisersProduct links shared in chats and feeds are fetched by Meta-WebIndexer. Keep it allowed so previews show the right image and price.
Transfon Security for e-commerceAllow Meta-WebIndexer on public pages so shared links preview well, and keep it off the app.
Transfon Security for SaaS and APIsrobots.txt is a request, not an enforcement. Transfon Security shows Meta-WebIndexer by name in the Top Bots report, so you can see how often it visits and which pages it reads. Block or allow it with a User Agent rule, or slow it down with a rate limit decision rule.
Transfon Security
Meta-WebIndexer is a bot in the link preview bots category, operated by Meta. The Meta-WebIndexer crawler navigates the web to improve Meta AI search result quality for users. In doing so, Meta analyzes online content to enhance the relevance and accuracy of Meta AI.
We have not confirmed whether Meta-WebIndexer follows robots.txt. Add a robots.txt rule, then check your logs to see that it stopped, and block it by user agent if it did not.
Add "User-agent: meta-webindexer" followed by "Disallow: /" to the robots.txt file at the root of your site. To enforce it, block requests whose user agent contains "meta-webindexer/" at your WAF. In Transfon Security that is one User Agent block rule.
No. robots.txt is voluntary, so Meta-WebIndexer may not follow it, and anyone can send Meta-WebIndexer's user agent, so a fake Meta-WebIndexer ignores your rule. Enforce the rule where requests arrive, at your WAF, and check the source network.
Link preview bots fetch a page when someone shares its URL in a chat app or social network, to build the preview card. Blocking them breaks your link previews, so keep them allowed but leave them out of analytics and ad requests.
Transfon Security identifies every bot in this directory in your traffic reports, flags fake search crawlers, and lets you allow, block or rate limit each bot.
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