How to Optimize Images for Google’s Multimodal Search

By Nathan Brooks

Google Search Console’s newly introduced “Multimodal” option under “Web” covers four image-led interfaces: Google Lens, Circle to Search, uploads to Google Search and Chrome’s “Search this image.”

Multimodal search accepts keywords, images, voice or combinations, and can change result formats. A voice request for a dog can return image results; a green-dress photo plus text seeking blue can return blue versions. Images now begin search journeys rather than merely support pages.

What does Google Search Console confirm?

In Performance, the “Search results” report filters by “Search type: Image.” It reports impressions and clicks for pages shown in image search, not individual image URLs. Zero impressions do not prove an indexing failure; the period may contain no relevant query, or the images may remain unindexed.

Use “Inspect any URL” on the host page and run a live test on the image URL to investigate access. Neither reliably confirms that a specific image appears in Google Images, and an indexed page does not prove its images are indexed.

These are confirmed tool limits. Treat missing reports, unusual logs and absent results as diagnostic signals, not definitive indexing verdicts.

How can publishers test image visibility?

For ecommerce catalogs with bespoke product photos, submit the same product through Circle to Search, Google Lens or a Google Search upload. The test shows whether Google matches the phone image to the company image and whether the company image dominates. It checks visibility, not guaranteed ranking.

In Google Images, src: plus the full asset URL can surface pages referencing that file; copy the image URL, not the page URL. Example: src:https://www.examplewebsite.com/media/happy-cat.jpg. If a site’s own pages do not appear, that may indicate an indexing issue. As with site:, absence does not prove deindexing.

Can crawler checks expose blocked images?

Googlebot-Image must find and parse the image itself, even when Google can reach its host page. Log files show whether it has accessed specific images recently. Repeated skips or no access suggest a block, but do not identify the cause.

Screaming Frog can reproduce the check. Set its user agent to “Googlebot Image,” then crawl image URLs and host pages for 3XX, 4XX and 5XX responses. Such a response can prevent access, although the effect depends on the response and Google’s handling.

Which technical faults can stop discovery?

• robots.txt: The file can block Googlebot-Image from image URLs. Dentsu’s robots.txt validator checks live rules for both image and landing-page URLs.
• Headers and tags: X-Robots-Tag can restrict the page or image. The <meta name="robots" content="noimageindex"> directive targets image indexing, while noindex targets the page. Chrome Developer Tools exposes tags in Elements and response headers in Network.
• CDN and server controls: Bot walls or server rules can block image crawlers. Separate CDN hosts can conceal issues from Search Console unless the host is included. If media.examplewebsite.com serves images for www.examplewebsite.com, track it separately and request the complete blocked-bot list and restricted paths.
• JavaScript: Blocked or failed scripts can hide images, while CSS background images can create discovery problems. Inspect rendered HTML and confirm important assets appear as <img> elements with valid src URLs.
• Lazy loading: It improves page speed, but Googlebot does not scroll or swipe through galleries. An image loaded only after interaction may remain inaccessible. Its URL in rendered HTML confirms access without interaction.
• Image URLs: References should return a direct 200 response. Broken URLs cannot be indexed. Google follows redirects, but chains or redirects to non-image resources waste crawl activity and may prevent selection. Include separate image subdomains in site crawls.

Keep URLs stable. A changing ?session= value creates duplicate files, as shown by www.examplewebsite.com/media/12345.jpg, the same URL with ?session=a1b2c3, and another with ?session=d1e2f3. Reference one URL per image.

How do sitemaps and metadata help bots?

XML image sitemaps tell search engines that images exist and where to find them. Useful entries include image:image metadata and image:loc. Large catalogs, such as social platforms and stock-image providers, need them because bots otherwise struggle to discover inventory and developers lack debugging evidence.

Use JPEG, PNG, WebP or AVIF. Responsive images should use <picture> or srcset, with a src fallback for bots that understand neither. The fallback is less important for standard bots such as Google Imagebot, but may be necessary for answer-engine bots.

Context determines whether bots understand the asset. Give images relevant titles, alt attributes and nearby descriptive copy. Schema.org ImageObject supplies context and can support result features. Licensing details can make an image eligible for Google’s “licensable” badge. With several images, primaryImageOfPage identifies one primary image.

Does paywalling block image discovery?

Content gating restricts material behind registration, login or subscription, common for whitepapers, lead-generation assets and news. Google allows bots to access gated text without logging in. Serving bots the authorized version and logged-out users a restricted version is not cloaking when the implementation follows Google’s paywall guidance and uses Paywall Structured Data.

Images carry a qualification. Google states in its image metadata guidance: “Make sure people can access and view your pages that contain images without needing an account or logging in.” The statement does not conclusively make every paywalled image ineligible for indexing or ranking. Paywall Structured Data alone, however, cannot be assumed to satisfy Google’s image-discovery and metadata-feature requirements.

What should publishers monitor next?

Start with Search Console’s Image and Multimodal filters, then compare them with Bing Webmaster Tools. Check image crawler logs, direct 200 responses, rendered HTML, sitemaps, structured data and paywall access before blaming ranking.

The immediate signal is retrieval and understanding. Monitor whether Google can access each image, identify its subject and connect it to the surrounding page. These checks keep multimodal optimization anchored in the same technical foundations as image SEO.