Image Alt Text Checker

Getting Started with Our Image Alt Checker Tool

"How do I check if an image has an alt tag?" If you've asked that, our Image Alt Text Checker is built for exactly this. Enter any URL and the tool scans every image on the page, flagging missing alt text, duplicates, and filename issues — so you can fix accessibility and SEO gaps in one pass.

How to Check if an Image Has Alt Text

There are three reliable ways to check alt text on any webpage — one fast, two manual.

1. Use the Alt Text Checker above (fastest)

Paste the page URL into the input at the top of this page and click Check. You'll get a per-image table showing which images have alt text, which are missing it, and which share duplicate alt tags across the page.

2. Inspect the image in your browser's DevTools

Works in Chrome, Firefox, Safari, and Edge.

1. Right-click the image and choose Inspect (or press F12 / Cmd+Option+I / Ctrl+Shift+I).
2. In the Elements panel, the <img> tag for that image is highlighted.
3. Look for the alt attribute inside the tag.

<img src="sunflower-field.jpg" alt="Field of bright yellow sunflowers under a blue sky">

The text inside alt="..." is the image's alt text. If the alt attribute is missing entirely, the image has no alt text. If it's present but empty (alt=""), the image is marked as decorative — which is valid but should be intentional.

3. View the page source

Right-click anywhere on the page and choose View Page Source, then search for <img (Ctrl+F or Cmd+F). Every image tag shows inline, including the alt attribute. Faster than DevTools when you want to scan many images at once.

What the Alt Text Checker Reports

For every image on the page, the tool reports four things:

1. Total images — the overall count on the page.
2. Missing alt tags — images without an alt attribute (the main accessibility and SEO issue).
3. Duplicate alt tags — images sharing identical alt text, which usually means generic placeholders instead of meaningful descriptions.
4. Filenames with underscores — underscores in image filenames are harder for search engines to parse than hyphens.

The detailed table shows each image's URL, filename, current alt text, and flags for the checks above — giving you a prioritized fix list.

How to Fix Missing or Poor Alt Tags

Once you have the report:

1. Add alt text to every missing image. Describe what's in the image concisely and meaningfully. For decorative images (dividers, backgrounds), use alt="" rather than omitting the attribute.
2. Rewrite duplicates. Each alt should describe that specific image — generic repeats tell search engines nothing.
3. Rename underscore filenames to hyphens. product_photo_1.jpg becomes product-photo-1.jpg. Update any references afterward.

Why Alt Text Matters for SEO and Accessibility

Alt text serves two audiences. For screen readers, it's the only way visually impaired users perceive what an image shows — missing alt text means a broken experience. For search engines, alt text helps Google understand image content, which feeds image search rankings and provides context for the surrounding page. Both WCAG accessibility guidelines and Google's SEO guidelines treat alt text as a requirement, not a nice-to-have.