Free tool
Image alt text validator
Paste existing alt text to catch common problems before publishing. Add an image URL only when the current text is weak and you want a replacement draft.
Good for
- Catch generic text like photo or image.
- Check length before publishing.
- Generate a replacement when the current text is weak.
Validation checks
- Empty or missing text.
- Generic one-word values.
- Very long descriptions that may be hard to scan.
- Marketing-heavy wording that does not describe the image.
Human review still matters
- Validation cannot know whether the text matches the actual image unless you provide the image URL.
- Short alt text can be good when the image is simple.
- Longer text can be appropriate for charts, diagrams, and screenshots.
Example verdict
"Photo" is too generic. "Black ceramic coffee dripper with a paper filter on a kitchen counter" is more useful if that is what the image shows.
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