Tool
Alt text and image checker
Updated Oct 8, 2026
Picture Check finds missing alt text, broken and heavy pictures, and photos that don't match their words.
What it finds
Alt text is the words a screen reader reads out in a picture's place. We check up to 10 pictures on a page.
- Doesn't match
A photo that contradicts its words: "Navy hoodie" showing a pink one. Claude, Anthropic's AI, looks at up to 6 pictures a page.
- Heavy photo
Pictures far bigger than the page needs. You get web-sized copies of the 4 heaviest, ready to upload.
- Missing picture
Pictures that don't load, so visitors see a blank space.
- No description
Pictures without alt text, or with a file name for one, which leaves screen reader users guessing.
- Placeholder
"Image coming soon" pictures that were never replaced.
Claude's answer for each picture is remembered, so the same picture isn't sent twice. We keep small copies of problem pictures to show in your report, and the smaller versions we make for you, for 90 days, then delete them.
Try it on Wrenfield's shop, a sample website we break on purpose.
See the site here (new tab).
Pictures without descriptions shut out people who use screen readers, and they're among the first things accessibility checks look for. Website accessibility: where to start, with the tools that help and what the law asks.
How to use it
- Type or paste your website's address, like YourWebsite.com. Any page works: copy it from the bar at the top of your browser.
- Press the button and leave the page open. It takes about a minute; the bar shows how far it's got.
- Your report opens by itself. The worst problems are at the top.
- Send the report's link to whoever fixes your site. They see exactly what you see, for 90 days.
- Once they've fixed things, check again to make sure.
What your results mean
- Problem
- What kind of fault it is. Every problem name, explained.
- Where
- The link, picture or words it's about, and where on the page (the menu, the footer, the page itself).
- What to tell your web person
- The fix, in words you can copy into an email. If you edit the site yourself, it's your to-do list.
- Nothing to fix
- We didn't find anything in what we checked. It doesn't promise the whole site is perfect: we check one page and up to 10 pictures on it.
- Smaller copies
- For heavy photos, the report has web-sized copies to save and upload in place of the originals.
- Doesn't match
- Claude, Anthropic's AI, thinks the photo contradicts its words. It can be wrong: look at the picture yourself.
When to use it
- After you add new photos, products or a gallery.
- Your pages feel slow, most of all on a phone.
- Someone else added pictures for you, and you want to know they have descriptions.
- Before a redesign, to see which photos need replacing.
Why it matters
- People using screen readers hear the description in place of the picture. Without one, they hear a file name or nothing.
- Heavy photos make a page slow on a phone with a weak signal, and some visitors give up before it loads.
- A photo that contradicts its words (a summer picnic on the winter hours page) leaves visitors unsure which to believe.
Go deeper: Write good alt text. Describe your pictures for people who can't see them, with examples.