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web validator

Image Alt Text Validator

Check images for missing alt text to improve accessibility and SEO.

Results

Paste input and validate locally.
Status
Ready when you validate.
Details
Ready when you validate.
Images found
Ready when you validate.
Missing alt
Ready when you validate.

How to use this validator

  1. Paste the HTML snippet.
  2. Run validate to find images and flag missing/empty alt attributes.
  3. 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

Valid

  • <img src="hero.jpg" alt="Hero image" />

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.

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Structure check only; does not judge alt text quality.