What Is Google Web Preview?

Google Web Preview is a fetcher operated by Google. If you think this is incorrect or can provide additional detail about its purpose, please let us know. You can see how often Google Web Preview visits your website by setting up Dark Visitors Agent Analytics.

Agent Type

Expected Behavior

Fetchers retrieve metadata from web pages to generate link previews in social media platforms, messaging apps, and content aggregators. They're triggered on-demand when users share or post links, fetching information like titles, descriptions, and thumbnail images. Traffic is unpredictable and correlates with how often your content is shared. Viral content may trigger thousands of fetcher requests in a short period. Fetchers typically access only the shared URL rather than crawling your site.

Detail

Top Visited Website Categories

User Agent String

Access other known user agent strings and recent IP addresses using the API.

Robots.txt

In this example, all pages are blocked. You can customize which pages are off-limits by swapping out / for a different disallowed path.

User-agent: Google Web Preview # https://darkvisitors.com/agents/google-web-preview
Disallow: /

Frequently Asked Questions About Google Web Preview

Should I Block Google Web Preview?

No. Blocking fetchers prevents link previews from appearing when your content is shared on social media, messaging apps, and other platforms. This significantly reduces click-through rates and social engagement. Link previews are crucial for content distribution.

How Do I Block Google Web Preview?

If you want to, you can block or limit Google Web Preview's access by configuring user agent token rules in your robots.txt file. The best way to do this is using Automatic Robots.txt, which blocks all agents of this type and updates continuously as new agents are released. While the vast majority of agents operated by reputable companies honor these robots.txt directives, bad actors may choose to ignore them entirely. In that case, you'll need to implement alternative blocking methods such as firewall rules or server-level restrictions. You can verify whether Google Web Preview is respecting your rules by setting up Agent Analytics to monitor its visits to your website.

Will Blocking Google Web Preview Hurt My SEO?

Blocking fetchers will hurt your social SEO and content distribution. Link previews significantly improve click-through rates from social media, messaging apps, and other platforms. Without previews, your content appears less engaging when shared, reducing social signals that can indirectly benefit search rankings.

Does Google Web Preview Access Private Content?

Fetchers only access the specific URLs that users share or embed, without credentials or authentication. They're designed to retrieve publicly accessible metadata and preview information. Fetchers don't crawl beyond the shared URL and can't access private content unless the shared link itself provides public access to otherwise private information.

How Can I Tell if Google Web Preview Is Visiting My Website?

Setting up Agent Analytics will give you realtime visibility into Google Web Preview visiting your website, along with hundreds of other AI agents, crawlers, and scrapers. This will also let you measure human traffic to your website coming from AI search and chat LLM platforms like ChatGPT, Perplexity, and Gemini.

Why Is Google Web Preview Visiting My Website?

Google Web Preview visited your site because someone shared one of your URLs on a social platform, messaging app, or another service that generates link previews. The fetcher was triggered when the link was posted to retrieve your page's title, description, and preview image.

How Can I Authenticate Visits From Google Web Preview?

Agent Analytics authenticates agent visits from many agents, letting you know whether each one was actually from that agent, or spoofed by a bad actor. This helps you identify suspicious traffic patterns and make informed decisions about blocking or allowing specific user agents.