Do image links really matter for SEO without anchor text?

Does Google really follow links placed on images?

The answer is yes. Google crawls and follows hyperlinks placed on images, just like it does for traditional text links. The crawler detects the <a> tag surrounding the image, identifies the destination URL, and queues it for later crawling.

However, the mechanics of following do not guarantee the transmission of qualified authority. A followed link doesn't mean a comprehended link. Google needs to qualify this link: what is its subject, thematic relevance, and intent? Without explicit text, this qualification becomes blurry.

Why is textual context critical for an image link?

In a traditional text link, the anchor provides a direct semantic signal: the clickable text explicitly indicates the subject of the target page. This signal influences thematic PageRank and Google's ability to understand the relationship between the source page and the destination page.

With an image link, this signal disappears. The image itself can be analyzed by Google’s computer vision algorithms, but this analysis remains probabilistic and imperfect. The missing context weakens the understanding of the link, especially if the image is abstract, decorative, or ambiguous.

Can the alt attribute really compensate for the absence of anchor text?

Mueller claims that the alt attribute can compensate for this lack. In practice, the alt attribute becomes the substitute anchor text when an image serves as a support for a hyperlink. Google reads this attribute as it would read traditional clickable text.

But this compensation has limits. A poorly written alt, too generic, or crammed with keywords produces the same effect as bad anchor text: dilution of the signal, or even penalty if the optimization is excessive. The descriptive quality of the alt directly conditions the semantic value of the link.

• Google technically follows all image links, whether they have an alt or not.
• Without textual context or alt, the link is followed but poorly qualified: Google does not understand why this link exists.
• The alt attribute plays the role of anchor text for links placed on images.
• A generic or absent alt weakens the transmission of thematic authority, even if the link remains technically active.
• The surrounding context (paragraphs, nearby titles) can also help Google qualify the link, but the alt remains the most direct signal.

Is this statement consistent with what we observe on the ground?

Yes, it aligns with practitioner observations. Log audits clearly show that Googlebot follows image links, including those without alt. Destination URLs appear correctly in crawl queues. The difference lies in the effectiveness of the link for ranking.

A/B tests on pages receiving only image links show measurable authority transmission, but significantly weaker than for text links with optimized anchors. The performance gap widens even more when the alt is absent or shallow. [To be confirmed]: Google does not communicate precise metrics on this power differential.

What nuances should be added to this recommendation?

Mueller remains deliberately vague on a key point: what proportion of the traditional anchor signal can the alt actually transmit? We know that an image link with a well-written alt works, but no one can claim it equals a pure text link in terms of semantic weight.

Another nuance: the surrounding context also matters. An image link placed in a dense article, surrounded by thematically coherent paragraphs with the target page, benefits from indirect semantic context. Google can cross-reference these signals to better qualify the link, even if the alt is mediocre. Conversely, an image link isolated in a generic sidebar, without alt, becomes nearly useless for SEO.

In what cases does this rule not apply fully?

Websites with a strong visual component (portfolios, e-commerce galleries, architect sites) heavily utilize image links. For these sites, relying solely on the alt may not be enough if internal navigation relies 80% on clickable images. Google recommends in these cases to double up with alternative textual links, even if discreet.

Another edge case: dynamically generated images or CSS sprites where the alt may be absent or poorly managed technically. Modern CMS handle this issue better, but custom or old sites accumulate this kind of technical debt. A manual audit of link templates remains essential.

What should be done concretely on an existing site?

Audit all links placed on images: extract the complete list from your crawl (Screaming Frog, Oncrawl, Botify). Identify clickable images without alt attributes, or with generic alts like "image", "photo", "logo". These links exist but lose their SEO potential.

Prioritize corrections according to impact: start with image links in editorial content, structuring internal linking (product pagination, categories), and recurring templates (related articles, associated products). Image links in the footer or generic sidebar are secondary, unless your site heavily relies on them for navigation.

What mistakes should be avoided when writing alt attributes?

Do not stuff the alt with keywords like over-optimized anchor text. Google has already penalized sites abusing this practice. The alt should describe the image honestly while naturally integrating the link's context. If the image shows red shoes and the link points to the product sheet, "Nike Air Zoom Red Running Shoes" works better than "Buy cheap running shoes on sale".

Avoid also empty alts on clickable images. An alt="" signals to Google that the image is purely decorative, which contradicts the presence of a link. An image link without alt generates a signal inconsistency that Google interprets as technical negligence.

How can I check if my image links are properly optimized?

Use a complete crawl to extract all <a><img> tags and their associated alt attributes. Export the list into a spreadsheet: source URL, target URL, alt text, position on the page. Filter for lines where alt is empty, too short (less than 3 words), or massively duplicated.

Then cross-reference with your log data: are the target URLs of these image links being crawled by Google? If so, are you seeing a ranking improvement after correcting the alts? Test on a representative sample before rolling out on a large scale, especially on sites with several thousand pages.

• Crawl the site to identify all image links and extract their alt attributes.
• Correct image links in editorial content and strategic internal linking as a priority.
• Write descriptive and contextual alts, not SEO anchors stuffed with keywords.
• Avoid empty or generic alts ("image", "photo") on clickable images.
• Test impact on a sample before generalizing the correction across the site.
• Document templates and components to avoid regression during future updates.