Image Alt Text Checker
Find missing and weak alt text
What Is the Image Alt Text Checker?
The Image Alt Text Checker renders a page, lazy-loaded images included, and judges the alt text of every image with a thumbnail beside it. It separates genuinely missing alt text from correct decorative images, and flags the descriptions that need rewriting: file names, keyword lists, generic words, overlong text and empty alt on linked images.
Key Features
Empty Is Not Always Wrong
An image that's purely decoration should have alt="", which tells screen readers to skip it. Many checkers count those as failures and bury the real problems under noise. This one marks them as correct, unless the image is the only content of a link, because then the link has no name at all.
Descriptions That Describe Nothing
alt="image", alt="IMG_4021.jpg" and alt="proxy, proxies, best proxy, cheap proxy" all pass a basic presence check and all fail the people relying on them. The checker reads the text itself, so you get a short list of descriptions to rewrite rather than a percentage.
Common Use Cases
- Working through an accessibility audit
- Cleaning up product and blog images for image search
- Reviewing a page before it goes live
- Handing an editor a CSV of images to describe
Frequently Asked Questions
Is the Image Alt Text Checker free?
Yes. It's free with a ProxyHorizon account, and every account gets 25 runs a day shared across all our data tools. You can read about the tool without signing in, but running it needs an account because each run fetches live data.
Should every image have alt text?
Every image needs an alt attribute, but not every one needs words. Meaningful images need a description; decorative ones need an empty alt so assistive tech skips them.
Why 125 characters?
Popular screen readers start breaking descriptions into chunks around there, and longer text usually stops describing and starts explaining. Put detail like that in a caption instead.
Are tracking pixels counted?
No. Images two pixels wide or smaller are left out of the results, since nobody sees them.
Do you store my results?
No. We log which tool you ran, what you entered and when, so we can apply the daily limit. Results aren't saved, so export them as CSV or JSON if you want to keep them.
Auditing sites or tracking SEO every day?
Proxies for SEO monitoring