SEO Tools
Image alt text checker.
Paste a page's HTML to list every image with its alt text and file name, and find missing alt attributes, alt text that is a file name or a single generic word, and overlong descriptions.
Input
Result
Paste the page HTML, then press Check.
How the image alt text checker works
The tool reads every <img> tag as text. Pasted markup is not loaded, so no image is requested. Inline SVG and CSS background images are not counted.
Worked example
Click Load example. The first image has the alt text IMG00023.JPG (a file name, review), the second has no alt attribute (fix), the third is well described (OK), and the fourth uses alt="" for a divider (note: correct only if purely decorative).
What is checked
- No alt attribute: fix, unless the image is marked
role="presentation",role="none"oraria-hidden="true". alt="": a note. The W3C accessibility tutorials treat empty alt as the right choice for decorative images.- Alt that is a file name or a single generic word such as "image" or "photo": review.
- Alt over 125 characters: review. This is the tool's own rule of thumb; neither Google nor the W3C sets a limit.
- "Image of..." openers: a note, since screen readers already announce an image.
- Generic file names such as
IMG00023.JPGorimage1.jpg; Google suggests short descriptive names.
Google says alt text helps it understand an image and should be useful, information-rich and not stuffed with keywords. The tool cannot see the image, so it cannot judge whether the description is accurate.
Sources
- Google Search Central: Google Images best practices (alt text and file names)
- W3C WAI: images decision tree
Sources reviewed October 2026.
Image Alt Text Checker FAQ
What should alt text say?
Describe what the image shows or does, in the context of the page. Google asks for useful, information-rich text and warns against stuffing keywords.
When is an empty alt correct?
For purely decorative images, where the image adds no information. Then alt="" lets screen readers skip it. The tool lists these as notes so you can confirm each one.
Is there a maximum alt length?
No official one. The tool flags text over 125 characters as its own prompt to shorten; treat it as a suggestion.
Does file name matter?
Google recommends short, descriptive file names, such as my-new-black-kitten.jpg rather than IMG00023.JPG.
Does it load my images?
No. It reads the markup you paste and makes no requests.