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Image Alt Text Checker
Find every image with no alt text, or bad alt text.
Quick Tool Overview
The Image Alt Text Checker lists every image on a pasted page with its alt text, dimensions and loading attribute. It separates the three cases that matter — no alt attribute at all, an explicitly empty one, and alt text that exists but is useless — because a missing alt gets a filename read aloud while an empty one correctly silences a decorative image.
- What it does
- Audits every image on a page for alt text quality
- You give it
- The page source, or just its body
- You get back
- Every image listed, with the missing and weak alts flagged first
- Best for
- Accessibility passes and image SEO before a page goes live
About the Image Alt Text Checker
Paste a page and every image in it is listed with its alt text, its dimensions and its loading attribute. The ones with no alt at all come first, then the ones whose alt text is the filename, then the ones long enough to be a paragraph.
The distinction the tool insists on is the one most alt text guides skip: a missing alt and an empty alt are different things. No alt attribute means a screen reader will read the filename out loud, which is why "DSC_04412.jpg" gets announced to people. An explicitly empty alt tells assistive technology to skip the image entirely, which is exactly right for a decorative divider or a spacer. So a page is not finished when every image has words in its alt; it is finished when every meaningful image is described and every decorative one is silenced.
Key features of the Image Alt Text Checker
Missing versus empty
The two are opposite meanings, not degrees of the same thing, and the report treats them that way.
Filename detection
Alt text that is really just DSC_04412 or hero-banner-final-2 is caught and flagged.
Length warnings
Anything past about 125 characters is more paragraph than alt, and is called out.
Loading and dimensions
Missing width and height attributes and absent lazy loading are noted alongside.
Decorative image guidance
Dividers and spacers should carry alt="", and the tool says which of yours should.
How to use the Image Alt Text Checker
-
1
Paste the page
Source or body. Every img element and its attributes are read out.
-
2
Start with the missing
Images with no alt attribute are listed first — those are the ones read aloud as filenames.
-
3
Check the weak ones
Filenames used as alt text, generic words like "image", and alt text over 125 characters are flagged.
-
4
Silence the decorative
Dividers and spacers should carry alt="" rather than a description of a line.
Frequently asked questions
A missing alt attribute leaves assistive technology to guess, and most screen readers fall back to reading the filename aloud. An explicitly empty alt is an instruction to skip the image, which is the correct treatment for anything purely decorative. They are opposite meanings, not degrees of the same thing.
Long enough to convey what the image contributes and no longer — usually well under 125 characters. If an image genuinely needs a paragraph, that paragraph belongs in the page text, with a short alt pointing at it.
Only if they honestly describe the image. Alt text is read aloud to people who cannot see the picture, and keyword-stuffed alt text is both useless to them and a well-known spam signal. Describe the image; the keywords take care of themselves.
It is the main thing Google has to go on for image search, alongside the filename, the surrounding text and the page it is on. So yes — but the version that helps is the accurate description, not the stuffed one.
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