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 October 19, 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

Yandex Image Resizer in context

Yandex Image Resizer is a user-triggered agent operated by Yandex. In plain terms, it fetches a page when a person asks an assistant or app to open it. Our database files it under search engines and ranks it Tier 3, mid-priority crawlers with a clear purpose but a smaller audience. 62 of the 63 search engines in our database share this tier.

Its safety rating is safe and its blocking impact is not documented. So the decision about Yandex Image Resizer rests on what you want from Yandex, not on its behaviour. How we rate safety and impact.

How site owners treat Yandex Image Resizer

Our robots.txt study of the Tranco top 10,000 did not track YandexImageResizer as a named token, so we do not publish an adoption figure for it. If you run a large site, your own logs are the best evidence of how often it visits.

Does it follow robots.txt?

Yandex Image Resizer's operator does not clearly document how it treats robots.txt. Write the Yandex Image Resizer rule anyway, then confirm in your logs that its requests stop.

Yandex crawlers and close alternatives

Yandex Image Resizer is one of 39 Yandex crawlers in our database. A User-agent: YandexImageResizer group controls Yandex Image Resizer only; the other Yandex tokens below need their own lines.

  • YandexImageResizer: this crawler (Tier 3)
  • YaDirectFetcher: Yandex Direct Fetcher, checks pages for an SEO, uptime or analytics service (Tier 3)
  • Yandex: Yandex, builds a search or answer index (Tier 3)
  • YandexAccessibilityBot: Yandex Accessibility, builds a search or answer index (Tier 3)
  • YandexAdditional: YandexAdditional, builds a search or answer index (Tier 3)
  • YandexAdditionalBot: YandexAdditionalBot, builds a search or answer index (Tier 3)
  • YandexAdNet: Yandex Advertising Network, checks pages for an SEO, uptime or analytics service (Tier 3)
  • YandexBlogs: Yandex Blogs, builds a search or answer index (Tier 3)
  • YandexBot: Yandex Search, builds a search or answer index (Tier 3)

To give Yandex Image Resizer the same answer as its siblings, stack User-agent: YandexImageResizer with their lines above one set of rules; to treat Yandex Image Resizer differently, give it its own group.

No other crawler in our search engines category has exactly the same purpose, which makes Yandex Image Resizer an unusual case: decide about it on its own merits.

We first recorded YandexImageResizer on September 22, 2026. Yandex documents it on yandex.com, and we recheck that page before each release.

Which rule Yandex Image Resizer actually follows

Yandex Image Resizer reads exactly one group in robots.txt, the most specific one that names YandexImageResizer, and never combines rules across groups. This short file shows the trap:

User-agent: *
Disallow: /private/

User-agent: YandexImageResizer
Disallow: /drafts/
  1. Find the group. Yandex Image Resizer looks for a group naming YandexImageResizer. One exists, so it ignores User-agent: * completely.
  2. Apply only that group. It is refused /drafts/ and nothing else.
  3. The surprise. /private/ is open to Yandex Image Resizer, because that rule lives in the * group it no longer reads. To keep it out of both, repeat Disallow: /private/ inside its own group.
Test yourself: does a rule under User-agent: * apply to Yandex Image Resizer if the file also has a User-agent: YandexImageResizer group?

No. Once a group names it, Yandex Image Resizer reads only that group. Put every rule you want it to follow inside its own group.

Test yourself: will blocking Yandex Image Resizer remove your pages from AI answers?

Often, yes. Yandex Image Resizer is a user-triggered agent, so pages it cannot fetch can drop out of the answers or results it supports.

Test yourself: is User-agent: yandeximageresizer the same as User-agent: YandexImageResizer?

Yes. RFC 9309 makes user-agent matching case-insensitive. Paths are a different story: Disallow: /Blog/ does not block /blog/.

Should you allow Yandex Image Resizer? Decide by situation

Recommended setting for Yandex Image Resizer by type of site
If you are...Recommended setting
You publish content and want AI answers to cite itAllow it. Yandex Image Resizer fetches pages for answers, so blocking it can remove you from them.
You license content and want to stop AI trainingBlocking it does not stop training, because Yandex Image Resizer is a user-triggered agent. Block the operator's training crawler instead.
You run an online shopAllow it unless it is overloading your servers.
Your server is under load from botsRate-limit before blocking. It is rated safe in our database.

Check Yandex Image Resizer on your own site

  1. Open /robots.txt on your domain and search for YandexImageResizer. If it is not named, it follows User-agent: *.
  2. List the Disallow lines in the group Yandex Image Resizer follows and test your key URLs against them; the longest match wins, and Allow wins a tie.
  3. Look beyond the file. A firewall or bot manager can refuse Yandex Image Resizer even when robots.txt allows it, and that never shows in the file.
  4. Run our website crawlability test to see how Yandex Image Resizer and every other crawler we track are treated in one pass, including firewall refusals.

Common mistakes with Yandex Image Resizer

The errors we see most often with Yandex Image Resizer in the files and firewalls we test:

  1. Assuming a robots.txt rule will stop Yandex Image Resizer. User-triggered fetches act for a person, and some operators say robots.txt may not apply to them. Check the operator's statement above.
  2. Blocking Yandex Image Resizer as if it were a bulk crawler. It fetches one page because a person asked; blocking it means that person's assistant cannot read your page.
  3. Counting Yandex Image Resizer visits as crawl volume. Each request maps to a real user question, which makes the paths it requests a useful signal of what people ask about you.

All three hide inside a file that looks correct, so check Yandex Image Resizer from outside after every change.

Spotting Yandex Image Resizer in your logs

robots.txt says what Yandex Image Resizer may do; your access logs show what it actually did.

Count requests

On a server with standard Nginx or Apache logs, this counts matching requests per day (adjust the log path for your host):

grep -iE "YandexImageResizer" /var/log/nginx/access.log \
  | awk '{print $4}' | cut -d: -f1 | sort | uniq -c

And this shows which paths it requested most, which is the quickest way to see whether your Disallow lines are being respected:

grep -iE "YandexImageResizer" /var/log/nginx/access.log \
  | awk '{print $7}' | sort | uniq -c | sort -rn | head -20

Check the requests are genuine

Anyone can send the Yandex Image Resizer user-agent, so confirm the source before acting on a match:

  • YandexImageResizer: we hold no published IP list, so use reverse DNS where the operator documents a hostname and treat an unverifiable Yandex Image Resizer request with caution.

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.).

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