Image SEO Checker
This tool audits all the images in your HTML content and checks them for common SEO issues. Just paste your page's HTML below and you'll get a detailed report showing which images are missing alt text, have poorly formatted filenames, lack width/height attributes, and more. Fix these issues to improve your page's accessibility and search rankings.
Image Audit Results
Pro Tip: Focus on fixing errors first since they have the biggest impact on SEO. Missing alt text is the most common issue and also affects accessibility for screen reader users.
Why Does Image SEO Matter?
Images can drive a ton of traffic to your site through Google Image Search, but only if they're properly optimized. Search engines can't "see" images the way humans do - they rely on text signals like alt attributes, filenames, and surrounding content to understand what an image shows.
Properly optimized images also load faster, which improves your Core Web Vitals scores. And don't forget accessibility - alt text helps visually impaired users understand your content through screen readers.
What Does This Tool Check For?
This image SEO checker analyzes several important factors.
- Alt text. The most important image SEO factor. Missing or empty alt attributes are flagged as errors.
- Filename quality. Descriptive filenames like "blue-running-shoes.jpg" are better than "IMG_12847.jpg" or random strings.
- Width and height attributes. These help prevent layout shifts (CLS) which is a Core Web Vitals metric.
- Lazy loading. Images below the fold should use loading="lazy" to improve page speed.
- File format. Modern formats like WebP and AVIF offer better compression than older formats.
- Alt text length. Alt text that's too short or too long can be problematic.
How to Write Good Alt Text
Good alt text describes what's in the image in a way that's useful for someone who can't see it. Here are some tips.
- Be descriptive but concise. Aim for 125 characters or less. Screen readers may cut off longer text.
- Don't start with "image of" or "picture of." Screen readers already announce that it's an image.
- Include relevant keywords naturally. If your target keyword fits naturally, include it. But don't stuff keywords.
- Describe the context. A photo of a person might need different alt text depending on why it's on the page.
- Leave decorative images empty. If an image is purely decorative (like a divider line), use alt="" to tell screen readers to skip it.
Why Do Width and Height Attributes Matter?
When a browser loads a page, it needs to know how much space to reserve for images before they finish loading. Without width and height attributes, the browser has to wait until the image downloads to know its dimensions. This causes the page layout to "jump" as images load in - that's called Cumulative Layout Shift (CLS).
CLS is one of Google's Core Web Vitals metrics, and high CLS scores can hurt your rankings. Adding width and height attributes to your images is an easy fix that can make a real difference.
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