Alt tags, more accurately called alt attributes or alt text, are short written descriptions attached to images in your website's HTML. They serve two essential purposes: they make your content accessible to people who use screen readers, and they help search engines understand what an image depicts. Despite being simple to implement, alt tags are frequently ignored, left blank, or stuffed with keywords. Getting them right is a small effort that delivers meaningful gains in accessibility, image search visibility, and overall on-page relevance. This guide walks through exactly how to write alt tags that satisfy both search engines and real human users.
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What Are Alt Tags and Why Do They Matter?
When a browser cannot load an image, it displays the alt text in its place. When a visually impaired user navigates your page, their screen reader announces the alt text aloud. And when a search engine crawls your page, it uses the alt attribute as a primary signal to understand the image's subject. This means alt text influences three critical outcomes at once: accessibility compliance, user experience, and search rankings. Google has explicitly stated that alt text helps it understand images, and well-optimized images can appear in image search results, driving additional organic traffic.
The Accessibility Foundation
Before thinking about keywords, remember that alt text exists first and foremost for people. Millions of users rely on assistive technology to browse the web, and a well-written alt attribute is often the only way they can understand what an image conveys. This user-first mindset also happens to align perfectly with what search engines reward. When you write alt text that genuinely describes an image for someone who cannot see it, you naturally produce the clear, relevant descriptions that search engines value. Accessibility and SEO are not competing goals; they reinforce each other.
How to Write Effective Alt Text
The best alt text is specific, concise, and contextual. Aim to describe the image in a way that would make sense to someone who cannot see it, while keeping the description relevant to the surrounding content. A few practical principles apply:
Be descriptive but brief. Aim for roughly a sentence or under about 125 characters, since some screen readers truncate longer text. Describe the meaning, not just the pixels. If an image illustrates a concept, capture that purpose rather than listing every visual detail. Include relevant context. A photo on a product page should mention the product; the same photo on a blog might be described differently. Avoid redundancy. Do not begin with phrases like image of or picture of, since the technology already knows it is an image.
Using Keywords the Right Way
Alt text is a legitimate place to include a relevant keyword, but only when it accurately describes the image. If you sell handmade leather boots and your image shows exactly that, alt text such as brown handmade leather ankle boots is both descriptive and keyword-rich. What you must avoid is keyword stuffing, where alt attributes are crammed with unrelated terms in an attempt to manipulate rankings. This practice harms accessibility, reads unnaturally, and can be treated as a spam signal. The rule is simple: describe first, optimize second, and never sacrifice clarity for keyword density.
Special Cases and Decorative Images
Not every image needs descriptive alt text. Purely decorative images, such as background flourishes, dividers, or icons that add no informational value, should have an empty alt attribute. This tells screen readers to skip them, preventing unnecessary noise for users. Functional images, like a magnifying glass icon that triggers search, should describe the function rather than the appearance, for example search. Complex images such as charts and infographics may require a longer description elsewhere on the page, with the alt text providing a concise summary and pointing to the fuller explanation.
Common Alt Text Mistakes
Several recurring errors undermine alt text effectiveness. Leaving the attribute out entirely is the most common, followed by using generic file names like DSC00123 as the description. Some writers duplicate the same alt text across many different images, which confuses both users and crawlers. Others write overly long, rambling descriptions that bury the key point. And of course, keyword stuffing remains a persistent temptation. Avoiding these mistakes is often as valuable as any positive optimization technique.
Alt Text and Image Search Traffic
Image search is a genuine and often underestimated source of organic traffic, particularly in visual industries like fashion, food, travel, and interior design. Well-optimized alt text, combined with descriptive file names, appropriate image sizing, and structured data, increases the likelihood that your images surface in relevant searches. Because visual search is growing, treating your images as first-class SEO assets rather than decorative filler can open a meaningful new channel of visitors who are often high in purchase intent.
Building an Alt Text Workflow
To keep alt text consistent across a growing site, build it into your content workflow rather than treating it as an afterthought. Establish a simple standard for your team, require alt text before any image is published, and periodically audit older content to fill in gaps. Many content management systems make the alt field readily available during upload, so the friction is minimal once the habit is established. Consistency over time is what turns a small tactic into a durable ranking and accessibility advantage.
Conclusion
Writing effective alt tags is one of the most accessible wins in all of SEO. It costs little, benefits real users, satisfies accessibility standards, and gives search engines the context they need to rank your images. By describing images clearly, using keywords honestly, handling decorative and functional images appropriately, and building alt text into your everyday workflow, you turn an often-neglected attribute into a reliable driver of visibility. Small, thoughtful descriptions add up to a more inclusive, more discoverable website.
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