Images make web pages engaging, but search engines cannot see a photo the way people do. They rely on signals such as file names, surrounding copy, structured data, and, most importantly, alternative text. Alt text is a short written description added to an image's HTML that tells screen readers and search crawlers what the image shows. When it is written well, alt text improves accessibility, helps images appear in Google Images, and strengthens the overall topical relevance of a page. When it is missing or stuffed with keywords, it becomes a wasted opportunity. This guide explains how to write SEO friendly alt text that serves both users and search engines.
How AAMAX.CO Helps Businesses Optimize Images for Search
Writing alt text for a handful of images is easy, but auditing thousands of product photos, blog graphics, and infographics across a large website requires process and expertise. AAMAX.CO is a full service digital marketing company that offers web development, digital marketing, and SEO services worldwide. Their team audits image libraries, identifies missing or weak alt attributes, compresses oversized files, and builds image optimization into a broader search engine optimization strategy. Because they also handle development, they can implement alt text at the CMS or template level so every future upload follows best practices automatically.
What Alt Text Is and Why It Matters
Alt text lives inside the alt attribute of an img tag. It was originally created for accessibility, giving visually impaired users who rely on screen readers a description of the visual content. It also appears in place of an image when the file fails to load. For SEO, alt text is one of the strongest signals Google uses to understand an image. Google has repeatedly stated that it uses alt text along with computer vision and page context to determine what an image is about and when to show it in search results.
That means alt text supports three goals at once: it makes your site more inclusive, it increases the chance your images rank in image search, and it reinforces the relevance of the page for its target topic.
Describe the Image Clearly and Specifically
The first rule of good alt text is simple: describe what is actually in the image. Imagine explaining the picture to someone over the phone. Vague descriptions such as "image" or "photo" offer no value. Instead of writing "shoes," write "white leather running shoes with gold laces on a wooden floor." Specific details help both screen reader users and search engines understand context.
Focus on the elements that matter for the page. On a product page, describe the product, color, material, and angle. On a blog post, describe what the image demonstrates. For a chart, summarize the key insight the chart communicates rather than simply naming it.
Keep Alt Text Concise
Most screen readers handle alt text best when it stays around 125 characters or fewer, so aim to stay within that range. Concise alt text forces you to prioritize the most important details. Avoid starting with phrases like "image of" or "picture of" because screen readers already announce that the element is an image. Get straight to the description.
If an image is complex, such as a detailed infographic, use brief alt text and provide a longer explanation in the surrounding content or a caption. That keeps the experience smooth for assistive technology users while still giving search engines rich context.
Use Keywords Naturally, Never Stuff Them
Including a relevant keyword in alt text can help, but only when it accurately describes the image. If your page targets "handmade ceramic coffee mugs," an alt attribute such as "handmade ceramic coffee mug with speckled blue glaze" is natural and useful. Writing "coffee mug, ceramic mug, handmade mug, best coffee mug buy" is keyword stuffing. It creates a poor experience for screen reader users and can be seen as spam by search engines.
A good rule is to write for the human first. If the description reads naturally aloud, it is probably well optimized. Not every image needs a keyword, and forcing one into every alt attribute across a page looks manipulative.
Know When to Leave Alt Text Empty
Purely decorative images, such as background textures, spacers, or ornamental dividers, do not add meaning to the content. For these, use an empty alt attribute (alt=""). This tells screen readers to skip the image entirely, which improves accessibility. Do not remove the attribute completely, because a missing alt attribute may cause screen readers to read out the file name instead.
Pair Alt Text With Other Image SEO Signals
Alt text works best alongside other image optimization practices. Use descriptive file names like blue-ceramic-coffee-mug.jpg instead of IMG_4829.jpg. Place images near relevant text so search engines can connect them to the topic. Compress images and serve modern formats such as WebP or AVIF to improve page speed, which affects Core Web Vitals. Add width and height attributes to prevent layout shifts, and include images in your XML sitemap or use structured data where appropriate.
Captions are also valuable. Readers often scan captions even when they skim body copy, and captions provide additional context that search engines can use.
Examples of Weak Versus Strong Alt Text
Consider an image of a team meeting on a services page. A weak alt attribute would be "meeting." A keyword-stuffed one would be "SEO agency SEO team SEO meeting SEO experts." A strong version would be "marketing team reviewing an SEO performance dashboard in a conference room." The strong version is descriptive, relevant, and naturally includes topical language.
For a recipe image, avoid "food" and instead write "homemade margherita pizza with fresh basil on a wooden board." For a logo, simply use the company name followed by "logo."
Audit Your Existing Images
Many websites have hundreds of images with missing or poor alt text. Crawling tools such as Screaming Frog, Sitebulb, or the accessibility checks in Lighthouse can identify images without alt attributes. Prioritize high-traffic pages and product pages first, then work through the rest of the site. Build alt text requirements into your content publishing checklist so the problem does not return.
Conclusion
SEO friendly alt text is clear, specific, concise, and written for people first. It improves accessibility, helps your images rank in visual search, and strengthens the relevance of every page. By describing images accurately, using keywords only when they fit naturally, leaving decorative images empty, and pairing alt text with optimized file names and fast-loading formats, you turn every image into an asset that supports your rankings. If your site has a large image library or you want image optimization handled as part of a complete strategy, partnering with an experienced SEO team can save time and deliver measurable results.
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