Why does Google still struggle to index image-based sites effectively?

What does Google really say about text and indexing?

Google acknowledges a technical limitation that many SEOs are already aware of: the engine cannot fully understand the content of a page if it relies solely on images. Despite advancements in artificial intelligence and computer vision, the indexing algorithm continues to primarily rely on HTML text.

Specifically, if your page displays critical information (titles, descriptions, prices, features) solely as images — even with visible text for the user — Google will not read them. This statement confirms that OCR (Optical Character Recognition), which would allow the extraction of text from images, is not integrated into the standard indexing pipeline.

Why is OCR still not deployed in indexing?

Google does have effective OCR technologies used in Google Photos, Google Lens, or Google Cloud Vision. The real question concerns the cost-benefit trade-off: processing each image on every web page through OCR represents a massive computational burden.

The absence of OCR in standard indexing also reflects a reliability constraint. OCR makes mistakes, especially with stylized fonts, text overlays, compressed images, or non-Latin languages. Google prefers to rely on structured HTML text, which guarantees quality and accessibility.

What does it mean to ‘use Google Web Fonts’ in this context?

This recommendation can be confusing. Google does not say that Web Fonts magically improve indexing. What needs to be understood is that using web fonts (instead of embedding text in images) ensures that your content remains HTML text, thus crawlable and indexable.

Replacing image-text with real text styled using CSS and Web Fonts is the recommended technical solution. You maintain creative control over typography while making the content accessible to crawlers. The alt attribute on images remains the fallback solution when an image is necessary (logo, infographic, chart).

• HTML text remains the only format fully understood by Google indexing bots
• OCR is not used in the standard indexing process, despite its existence in other Google products
• Alt attributes are mandatory for any image carrying semantic information
• Web fonts allow you to maintain a visual aesthetic without sacrificing crawl accessibility
• E-commerce sites with product listings as images are particularly vulnerable to this issue

Does this statement align with real-world observations?

Absolutely. SEO audits regularly reveal sites that lose positions because their main content is locked in images. This is particularly common on luxury e-commerce sites, creative portfolios, and landing pages designed solely in Photoshop and then exported as images.

I have seen sites lose 60% of their organic traffic after a redesign that replaced HTML text with PNG visuals. Google indexed the pages, but with no textual content to analyze, the engine could no longer determine their relevance for specific queries. Rankings collapsed.

What nuances should be added to this recommendation?

Google does not say that images are useless for SEO—that would be absurd. What it says is: images alone are not enough. A page with optimized images (size, format, alt, textual context) performs better than a pure text page. However, a page with only images, even perfectly optimized, remains invisible for semantic indexing.

Another nuance: Google Images does indeed use visual analysis to rank images (object, scene, face recognition). However, this system operates in parallel with standard web indexing. A well-ranked image in Google Images does not necessarily help the hosting page rank for a textual query. [To be verified]: the actual impact of an image's ranking on the overall positioning of the page remains unclear in the official documentation.

In what cases does this rule not fully apply?

For visual queries (image search, Google Lens), Google naturally uses visual analysis rather than text. If your business model relies on visual discovery (fashion, decor, art), optimizing your images for Google Images is an absolute priority, regardless of text.

But be careful: even in this case, the textual context surrounding the image (caption, adjacent paragraph, page title) greatly influences the ranking in Google Images. The algorithm intersects visual analysis with textual signals. So, even for a 100% visual strategy, it is impossible to do without text.

What practical steps should be taken on an existing site?

Start with an audit of strategic pages. Identify all areas where information is displayed solely through images: banners with embedded text, CTA buttons in PNG, pricing tables in JPEG, infographics containing key data. For each element, ask yourself: is this content accessible to a bot?

Next, gradually migrate to styled HTML text. Use CSS to replicate the visual appearance: Grid, Flexbox, web typography, drop shadows, gradients. Modern browsers can recreate 95% of visual effects without relying on images. Keep images only for photos, illustrations, and truly visual graphics.

What mistakes should be avoided during this migration?

Do not blindly replace all your images with plain, ugly text. User experience is always paramount. If your redesign degrades the visuals to the point of driving visitors away, you lose even with better indexing. Find the balance between aesthetics and accessibility.

Another classic pitfall: stuffing the alt attribute with keywords thinking it compensates for the lack of HTML text. Alt is alternative text, not a spam field for SEO. Google knows how to differentiate between a natural descriptive alt and disguised keyword stuffing. Describe what the image shows, period.

How can I check if my site complies with this recommendation?

Test in text-only mode. Disable images in your browser (or use Lynx, a pure text browser). If your main content disappears or becomes unreadable, you have a problem. Bots see exactly what you see in this mode.

Also, use the URL Inspection tool in Search Console. Look at the HTML version rendered by Googlebot. If entire blocks are empty or replaced by img tags without adjacent textual context, these areas are black holes for indexing. Fix them as a priority.

• Audit all strategic pages to identify content displayed solely in images
• Migrate embedded text in images to styled HTML with CSS and Web Fonts
• Add descriptive and natural alt attributes to all informative images
• Test the site in text-only mode to verify content accessibility
• Check in Search Console that Googlebot can access the main text
• Prioritize SVG formats for logos and icons (indexable vector text)