Safe Official docs Search Engines

Yandex Image Resizer

Operated by Yandex

Quick Facts

User-Agent:
YandexImageResizer
Category:
Search Engines
Operator:
Yandex
Safety:
Safe
Blocking Impact:
Low - No SEO ranking impact
SEO Impact Score:
2/10
Official docs:
yandex.com

Confirmed by the operator

Yandex names YandexImageResizer on its own documentation page, linked above. The token, purpose and robots.txt behaviour on this profile come from that page, re-checked on September 22, 2026.

What is Yandex Image Resizer?

Yandex Image Resizer is an on-demand AI fetcher operated by Yandex. It retrieves a page only when a user explicitly asks an AI assistant or agent to read, summarize, or act on a specific URL. Because it is triggered by real user intent rather than bulk crawling, blocking it mainly prevents users from pulling your content into Yandex's assistant.

Yandex Image Resizer is an on-demand AI fetcher operated by Yandex. It retrieves a page only when a user explicitly asks an AI assistant or agent to read, summarize, or act on a specific URL. Because it is triggered by real user intent rather than bulk crawling, blocking it mainly prevents users from pulling your content into Yandex's assistant.
Yandex Image Resizer uses the user-agent token YandexImageResizer. You can control it via robots.txt, meta tags (noai), or the emerging llms.txt standard. Robots.txt is voluntary; for hard enforcement, combine it with server-level IP blocking.

What happens if you block Yandex Image Resizer?

🔶 AI Visibility Trade-off - Blocking Yandex Image Resizer will not hurt Google or Bing rankings, but it can remove your content from AI search answers and assistant citations powered by this crawler. Block only if you have a deliberate reason.
Generally safe to allow; provides legitimate crawling value.

How to block Yandex Image Resizer with robots.txt

<code>User-agent: YandexImageResizer</code> - Matching is case-insensitive. Robots.txt is fetched from the root of each subdomain separately.

Block completely (robots.txt)
User-agent: YandexImageResizer Disallow: /
Allow all (robots.txt)
User-agent: YandexImageResizer Allow: /
Block private only (robots.txt)
User-agent: YandexImageResizer Disallow: /private/ Disallow: /api/ Disallow: /admin/ Allow: /
Nginx server block
# Nginx: Hard-block Yandex Image Resizer if ($http_user_agent ~* "YandexImageResizer") { return 403 "Bot blocked"; }
Apache .htaccess
# Apache: Hard-block Yandex Image Resizer SetEnvIfNoCase User-Agent "YandexImageResizer" bad_bot Order Allow,Deny Allow from all Deny from env=bad_bot
Meta robots tag
<meta name="robots" content="noindex, nofollow">
X-Robots-Tag header
X-Robots-Tag: noindex, nofollow

Is Yandex Image Resizer safe to allow?

Yes, Yandex Image Resizer is a safe and legitimate crawler operated by Yandex. It follows the Robots Exclusion Protocol (RFC 9309) and can be controlled with standard robots.txt rules.
Verify by reverse-DNS lookup: legitimate Yandex Image Resizer requests resolve to Yandex's domain.

What does Yandex Image Resizer do?

Understanding Yandex Image Resizer's purpose helps you decide whether to allow or block it.

  • Fetches a page only when a user asks an AI assistant to read it
  • Summarizes or extracts the URL the user provided
  • Triggered by real user intent, not bulk crawling
  • Low traffic volume compared with training crawlers
  • Blocking it prevents users from pulling your content into the assistant

Frequently Asked Questions

What is the official user-agent string for Yandex Image Resizer?
The official user-agent string for Yandex Image Resizer is: YandexImageResizer. Use this exact string in robots.txt, Nginx, Apache, or Cloudflare firewall rules to target this bot. Matching in robots.txt is case-insensitive. Verify a request genuinely comes from Yandex Image Resizer by performing a reverse-DNS lookup on the source IP.
Is Yandex Image Resizer safe?
Yes, Yandex Image Resizer is a safe and legitimate crawler operated by Yandex. It follows the Robots Exclusion Protocol (RFC 9309) and can be controlled with standard robots.txt rules.
Will blocking Yandex Image Resizer hurt my SEO?
🔶 AI Visibility Trade-off - Blocking Yandex Image Resizer will not hurt Google or Bing rankings, but it can remove your content from AI search answers and assistant citations powered by this crawler. Block only if you have a deliberate reason.
How do I block Yandex Image Resizer in robots.txt?
Add the following lines to your /robots.txt file:
User-agent: YandexImageResizer
Disallow: /

This instructs Yandex Image Resizer not to crawl any path on your site. To block only specific sections, replace / with the path (e.g., Disallow: /blog/).
Does Yandex Image Resizer respect robots.txt?
Yandex Image Resizer is operated by Yandex and is expected to fetch and parse /robots.txt before crawling, following RFC 9309. For hard enforcement, combine robots.txt with server-level IP or user-agent blocking.
How do I verify if Yandex Image Resizer is crawling my site?
Search your web server access logs for the string YandexImageResizer (case-insensitive: grep -i "YandexImageResizer" /var/log/nginx/access.log). Filter by user-agent in your log analytics tool (GoAccess, AWStats, etc.).

Related Bots