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Alt Text Checker

Find images missing alt text in your HTML source.

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Paste your HTML source. We'll check every image for alt text.

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How to Check Alt Text in Your HTML

View your page source (Ctrl+U on Windows, Cmd+Option+U on Mac), copy the HTML, and paste it above. The checker scans every <img> tag and reports which ones are missing alt attributes, which have empty or placeholder text, and which are too long for screen readers. You get a per-image breakdown and a validation checklist so you know exactly what to fix.

Why Alt Text Matters

Alt text serves two audiences. Screen readers use it to describe images to people who can't see them — without it, users hear the filename or nothing at all. Search engines use it to understand image content since they can't "see" pictures. Missing alt text is one of the most common accessibility failures on the web and one of the easiest to fix. Every image that conveys information needs a text alternative.

Writing Good Alt Text

Describe the image's purpose, not just its appearance. A photo of a team celebrating a product launch should say what's happening, not just "group of people." Keep it under 125 characters — screen readers cut off long descriptions. Skip phrases like "image of" or "picture of" since the screen reader already announces it as an image. For decorative images that add no information (background patterns, spacers), use an empty alt attribute (alt="") to tell assistive tech to skip it entirely.

What happens if I leave alt text empty? +
An empty alt attribute (alt="") tells screen readers to skip the image entirely. This is correct for decorative images like background patterns or visual spacers. But if the image conveys information — a product photo, a chart, a diagram — an empty alt means that information is invisible to assistive technology users. Missing the alt attribute altogether is worse: some screen readers will read the image filename instead, which is almost never useful.
How long should alt text be? +
Keep it under 125 characters. Most screen readers announce alt text in a single pass at that length. Longer descriptions get cut off or become tedious to listen to. If an image genuinely needs a detailed explanation (like a complex chart or infographic), use alt text for a brief summary and link to a full text description elsewhere on the page.
Do decorative images need alt text? +
Decorative images should have alt="" (an empty alt attribute). This tells assistive technology to skip the image entirely. Without the alt attribute, screen readers may try to read the filename, which creates a confusing experience. The key question is whether the image adds information that isn't available in the surrounding text. If removing the image would lose meaning, it needs descriptive alt text. If it's purely visual decoration, use alt="".
Does alt text affect SEO rankings? +
Alt text is a ranking signal for Google Images and provides context that helps search engines understand your page content. It won't single-handedly boost your rankings, but missing alt text is a missed opportunity. Google has explicitly stated that alt text is one of the most important factors for image search. It also helps your images appear in Google Image search results, which can drive significant traffic for visual content.
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