Free Alt Text Checker & Length Counter
Paste your alt text and see at once whether it is too long, too vague or written like a keyword list. Works on one alt text or a whole batch.
Paste one alt text per line to check a whole batch.
Results appear here as you type. Nothing you type leaves your browser.
What makes good alt text
- Describe what matters in the image, in context, in about 125 characters or fewer.
- Skip “image of” and “photo of”; screen readers already say it is an image.
- Never use the file name, and give each image its own text.
- Write for people, not search engines: no keyword lists.
- For charts, state the takeaway and put the data in the page text.
See 20 annotated alt text examples, or let the alt text generator write drafts for you on your own device.
Frequently asked questions
How long should alt text be?
Aim for 125 characters or fewer. Some screen readers cut off longer alt text, so put the most important detail first. If an image needs more, use the surrounding page text or a caption.
Does the checker upload my text?
No. The checks run in your browser and nothing you type is sent to Neartool.
What does the checker look for?
Empty alt text, text over the character limit, prefixes like "image of", file names, one-word or generic text, duplicates in a batch, charts that need key numbers, repeated words and keyword lists.
Should decorative images have alt text?
Purely decorative images should have an empty alt attribute (alt="") so screen readers skip them. Every informative image needs a description.
Can I check alt text for a whole site?
Paste one alt text per line to check a batch. To write alt text for many images at once, use the alt text generator, which runs on your device.