Free tools / Alt text checker
Free alt text checker
Enter a page. The tool lists the images that have no alt attribute, so you can describe them for people using screen readers and for search engines.
See the free alt text checker in 21 seconds
Enter a page. The tool lists the images that have no alt attribute, so you can describe them for people using screen readers and for search engines. The result in the video is a real run.
Read the video transcript
Find images without alt text, for free. Type a page address, and press Check images. It lists the images that have no alt attribute, so you can describe them. That is one page. SEOSage checks every page of your website. Start your fourteen-day free trial at seosage.co.
What this tool checks
- Counts the images on the page
- Lists images with no alt attribute
- Counts images with an empty alt, which is correct for purely decorative images
Why it matters
Alt text describes an image for people who cannot see it and for search engines. An empty alt is fine for decoration. A missing alt attribute is what to fix.
Want this for every page of a website? See Fix and re-check in SEOSage.
How to read your result
- Missing alt means the image has no alt attribute. This is what to fix.
- Empty alt is correct for decoration, such as a divider.
- The list shows image addresses, up to 30.
- Background images set in CSS are not counted.
Common problems and fixes
- A meaningful image has no alt. Add a short description of what the image shows.
- Alt text stuffed with keywords. Write it for a person who cannot see the image.
- A logo or icon with no alt. Describe it briefly, for example the company name.
- A decorative image. Use an empty alt so screen readers skip it.
What is an alt text checker?
An alt text checker is a tool that reads a web page and lists any images that have no alt attribute. The alt attribute is a short text description of an image written into the HTML code. Screen readers use it to describe images to people who cannot see them. Search engines use it to understand what an image shows. An image with no alt attribute is inaccessible to screen reader users and invisible to search engines, while an image with an empty alt (alt="") is correct for purely decorative images and tells screen readers to skip it.
This free alt text checker counts all images on the page, lists the ones missing the alt attribute, and counts images with an empty alt. It covers images in the page HTML — not background images set in CSS. For a complete check across every page of a website, SEOSage flags images missing alt text in a crawl and lets you re-check a page after you fix it to confirm it is resolved.
How to write good alt text
- Describe what the image shows and why it is there. A photo of a dental clinic might be "Reception desk at Brightside Dental, open Monday to Saturday". A chart might be "Bar chart showing organic traffic growth from 200 to 800 visitors per month over six months".
- Keep it short. One to two sentences is usually enough. Screen readers read the entire alt text without a break.
- Do not start with "Image of" or "Photo of". Screen readers already announce images as images.
- Decorative images should have empty alt. An alt="" tells screen readers to skip the image entirely. Never leave the alt attribute out of a decorative image.
Questions about the alt text checker
What is alt text?
Alt text is a short description of an image in the page code. Screen readers read it aloud and search engines use it to understand the image.
What is the difference between missing and empty alt?
Missing means there is no alt attribute at all. Empty means alt is set to nothing, which tells screen readers to skip a decorative image.
How long should alt text be?
Keep it short and plain, describing what the image shows and why it is there.
Can SEOSage check this across my site?
Yes. It lists images missing alt text across a crawl, and after you fix one it re-checks and tells you Fixed, Still missing or Image removed.
Check every page of your website
SEOSage crawls your whole website on your own computer, with no page limit, and lists what to fix. Free for 14 days, cancel any time.