#443 · Developer Tool

HTML Image Alt Checker

Audit image alternative text in pasted HTML before an accessibility review or content release. The checker distinguishes missing alt attributes from intentional empty alternatives, flags vague filename-like wording, and notes linked images that may need to describe the link purpose. It reports evidence for each image instead of assigning a misleading universal accessibility score.

Developer Input

Image accessibility audit
Ad space

How to use this developer tool

  1. Paste source text or load the representative sample.
  2. Adjust the available parsing option when the tool provides one.
  3. Select Check Alt Text or press Ctrl/Cmd + Enter.
  4. Review the summary, issues, and copy-ready output before using it.

What this developer tool does

Each img element is classified as missing, decorative, usable, or review-needed. The checks cover absent alt attributes, empty alternatives, common placeholder phrases, filename extensions, excessive length, and linked images with no other accessible link text.

Each img element is classified as missing, decorative, usable, or review-needed. The checks cover absent alt attributes, empty alternatives, common placeholder phrases, filename extensions, excessive length, and linked images with no other accessible link text.

Automated checks cannot decide whether an accurate description matches the visual context. Review every non-decorative image with the rendered page.

Example

Input

<main>
  <img src="hero.jpg" alt="Developer reviewing a code diff">
  <img src="divider.svg" alt="" role="presentation">
  <a href="/reports"><img src="chart.png"></a>
  <img src="logo.png" alt="logo image">
</main>

Expected result

Run the sample to see a structured report generated by the same processing logic used for pasted input.

Use cases

  • Review front-end source during a code migration.
  • Create a structured handoff for documentation or QA.
  • Catch input-specific issues before committing generated output.

Tips for reliable output

  • Paste the smallest complete fragment that reproduces the case.
  • Use the sample once to confirm the expected input shape.
  • Review warnings instead of treating a clean report as a guarantee.
  • Keep the original source in version control before replacing it.
  • Test generated output in the target browser or application.

Processing details

Each img element is classified as missing, decorative, usable, or review-needed. The checks cover absent alt attributes, empty alternatives, common placeholder phrases, filename extensions, excessive length, and linked images with no other accessible link text.

Automated checks cannot decide whether an accurate description matches the visual context. Review every non-decorative image with the rendered page.

Frequently asked questions

Is an empty alt attribute always an accessibility error?

No. Empty alt text is appropriate for decorative images, but the image context and role still need review.

Does the checker understand linked images?

Yes. It flags a linked image when neither the image nor the surrounding link provides accessible text.

Can automated checks confirm that alt text is accurate?

No. Only a person who understands the image and page context can confirm descriptive accuracy.

Why are words such as image or logo flagged?

Those words alone rarely communicate the purpose or content of an image to someone who cannot see it.

Does the checker load image files from src URLs?

No. It inspects HTML attributes only and makes no network requests.

Output fields

FieldMeaning
SummaryCount and outcome of the current run
InterpretationWarnings and practical review guidance
ExportsCopy-ready output plus CSV or JSON when available

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