Valid
- <img src="hero.jpg" alt="Hero image" />
web validator
Image Alt Text Validator
Check images for missing alt text to improve accessibility and SEO.
Results
Processing…- Status
- Processing...
- Details
- Processing...
- Images found
- Processing...
- Missing alt
- Processing...
How to use this validator
- Paste the HTML snippet.
- Run validate to find images and flag missing/empty alt attributes.
- Add descriptive alt text (or empty alt for decorative images) and re-run.
Rules & checks
Finds all <img> tags in your HTML snippet.
Flags images missing alt attributes or with empty alt values.
Runs fully client-side; no data stored.
Inputs explained
HTML snippet
Paste HTML containing <img> tags. We check for missing or empty alt attributes.
When to use it
- QA landing pages for accessibility
- Check CMS output for missing alt attributes
- Support teams reviewing user-submitted HTML
Common errors
- Missing alt attribute
- Empty alt on non-decorative images
Limitations
- Structure check only; does not judge alt text quality.
- Does not fetch images or assess contextual meaning.
Tips
- Write concise, descriptive alt text for important images
- Use empty alt (alt="") only for decorative images
- Keep filenames/hrefs sensible, but rely on alt for meaning
Examples
Missing alt
- <img src="hero.jpg" /> -> flagged
Deep dive
This alt text validator finds <img> tags missing alt attributes entirely in your browser to boost accessibility and SEO hygiene.
Use it to clean CMS or template output before publishing.
FAQs
- Is anything uploaded?
- No. Parsing is local and clears on refresh.
Related validators
All validation happens in your browser. No data is sent, logged, or stored.
Structure check only; does not judge alt text quality.