Alt text best practices for SEO in 2026
Alt text best practices have not changed dramatically in recent years, but the way search engines evaluate them has become more nuanced. Google now explicitly recommends descriptive, information-rich alt text while discouraging keyword stuffing. Accessibility standards continue to emphasize context over description. And the growing role of Google Image search as a traffic source makes alt text a genuine ranking factor, not just an afterthought.
Here is what WordPress publishers need to know right now.
The core principle: describe the image in context
A good alt text answers one question: what does this image contribute to the page? The answer depends on both the image content and its role within the surrounding text.
A product photo on a WooCommerce page should describe the product. A blog header image that sets a mood might need a brief contextual phrase. A chart or infographic needs a summary of the data it presents. A decorative divider or background texture needs an empty alt attribute (alt="") so screen readers skip it entirely.
The mistake most publishers make is treating all images the same way. A single rule — like always using the page title — works well for some images and poorly for others. The best approach is a layered strategy: automated coverage for the majority, manual attention for the exceptions.
Keep it concise
There is no hard character limit for alt text, but practical evidence suggests that search engines give the most weight to roughly the first 16 words. Beyond that, the value diminishes. Screen readers also benefit from brevity: a 10-word description is more useful to a visually impaired user than a 50-word paragraph.
Aim for one clear phrase that captures the essential information. If you find yourself writing a sentence with multiple clauses, the alt text is probably too long.
Use keywords naturally, not forcefully
Google's image publishing guidelines recommend using alt text that is both descriptive and contextually relevant. This naturally incorporates keywords when the keyword matches the image content. If your page targets "wooden deck maintenance" and the image shows a deck being restored, an alt text like "sanding a weathered wooden deck before resealing" is both descriptive and keyword-relevant.
What Google discourages is stuffing: cramming multiple keywords into the alt attribute with no regard for readability. An alt text like "wooden deck maintenance repair sanding sealing deck restoration" is keyword-stuffed and provides a poor experience for screen reader users.
For sites using Bialty with focus keywords from Yoast, Rank Math, or AIOSEO, the keyword is applied systematically but as a single signal — not as a stuffed list. If the keyword itself is too generic for meaningful alt text, switching to the post title or image name is the better move.
Do not duplicate the surrounding text
A common anti-pattern is writing alt text that repeats the image caption, the heading above the image, or the paragraph next to it. Search engines can detect this redundancy, and it adds no value for accessibility. The alt text should complement the surrounding content, not echo it.
Handle different image types differently
Product images should describe the product specifically. "Men's waterproof trail running shoe in carbon grey" is better than "shoe" or "product image." For WooCommerce stores, using the product title as the alt text signal is often the strongest approach because titles are naturally specific.
Editorial images should relate to the article topic. If the image illustrates a concept, describe the illustration. If it is a stock photo used for visual interest, a brief contextual phrase is sufficient.
Infographics and charts should summarize the key takeaway, not describe every visual element. "Bar chart showing quarterly revenue growth from Q1 to Q4 2025" is more useful than describing each bar.
Decorative images — layout elements, background patterns, spacers — should have an empty alt attribute. Adding alt text to decorative images creates noise for screen reader users and dilutes the semantic signal for search engines.
Screenshots should describe what the interface shows and why it matters. "Bialty settings page showing alt text rule configuration for posts and pages" is better than "screenshot" or "settings."
One image, one alt text
Every meaningful image should have exactly one alt text that accurately represents it. Do not leave images without alt attributes at all (different from an empty alt=""), and do not assign the same generic alt text to every image on the page.
This is where automated tools need careful configuration. A plugin that applies the same page title to every image produces technically valid alt text but semantically poor results. Bialty addresses this by offering multiple signal sources — focus keyword, title, image name, or combined — so the output matches the content type and workflow.
Alt text is not the same as the title attribute
The HTML alt attribute and the title attribute serve different purposes. Alt text is for search engines and screen readers. The title attribute creates a mouse-hover tooltip and has minimal SEO or accessibility value. Do not optimize the title attribute as a substitute for proper alt text.
Automate coverage, refine manually
For sites with hundreds or thousands of images, writing every alt text manually is impractical. The realistic best practice is to automate the base layer — using a tool like Bialty that injects alt text from existing SEO context — and then manually refine the images that genuinely need unique descriptions.
This gives you broad coverage immediately, consistent quality across the site, and a manageable editorial workload focused only on the images where precision changes outcomes.
The checklist
Every image audit should verify that no meaningful images have a missing alt attribute, decorative images use alt="", alt text is concise and contextually relevant, keywords appear naturally without stuffing, product images reference the product specifically, the rendered frontend HTML is the proof layer (not the Media Library), and the approach scales across new content automatically.
Bialty handles the last point by injecting alt text dynamically at render time, so new pages and products are covered as soon as they are published.