Image Alt Checker
Scan any URL for images missing alt text. Improve accessibility and image search SEO. Free bulk image alt tag checker — paste URLs and get instant results.
What is an Image Alt Checker?
The Image Alt Checker fetches any URL and scans every img element on the page, checking whether each image has an alt attribute and whether that attribute contains a non-empty string. Images without alt text are listed with their source URL so you can locate each one in your CMS and add an appropriate description.
When Should You Use Image Alt Checker?
Run this on your most important pages and any page you have recently published or updated. Alt text serves two purposes: it describes an image to screen readers, making your content accessible to users with visual impairments, and it provides a text signal to search engines for image indexing. Missing alt text on product images is particularly common on e-commerce sites and represents lost image search traffic as well as an accessibility compliance gap.
How to Read Image Alt Checker Results
The tool distinguishes between images with no alt attribute at all and images with an empty alt attribute (alt=""). An empty alt is intentional and correct for decorative images that carry no content meaning — these should not be fixed. Images with no alt attribute are the ones that need attention. The tool lists the src URL for each to help you identify the image and find it in your source code or CMS.
What Should You Know Before Using Image Alt Checker?
Write alt text that describes the image as you would describe it to someone who cannot see it. For product images, include the product name, key attributes, and model number where relevant. For editorial images, describe what is happening or what is shown. Do not stuff keywords into alt text — describe accurately and let keyword relevance follow naturally from that accuracy. Prioritise images above the fold first, then work through the rest of the page.
Frequently Asked Questions
What is alt text and why is it important?
Alt text (alternative text) is an HTML attribute on img elements that describes the image content. It serves two purposes: it makes images accessible to users with visual impairments who use screen readers, and it provides a text signal to search engines for image indexing. Missing alt text harms both accessibility compliance and image search visibility.
What should alt text say?
Alt text should describe the image as you would describe it to someone who cannot see it — concisely and specifically. For product images, include the product name, key attributes, and model. For editorial images, describe what is happening. Do not prefix with 'image of' or 'photo of' — screen readers already announce the element type.
What is the difference between empty alt text and missing alt text?
An empty alt attribute (alt="") is intentional and correct for purely decorative images that convey no meaningful content — it tells screen readers to skip the element. A missing alt attribute entirely is an error: the screen reader will typically read out the image filename instead, which is meaningless to the user. Fix missing attributes; leave intentional empty ones.
Does alt text improve SEO?
Yes. Alt text helps Google understand image content for Google Images ranking, provides additional keyword context for the surrounding page, and is used by Google to verify that images match the page's claimed topic. E-commerce product images with descriptive, keyword-informed alt text rank in image search and can drive meaningful referral traffic.
How do I add alt text to images in WordPress?
In the WordPress media library, select any image and fill in the Alt Text field on the right side. For images in the block editor, click the image block and add alt text in the Image Settings panel on the right. For programmatic alt text on WooCommerce products, use the product image's dedicated alt text field in the product editor.
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