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Image Alt Text Checker

Q: What problem does the alt checker solve?

It lists images with missing, empty, filename, or overlong alt text so you fix accessibility and image SEO context.

Q: Is empty alt always wrong?

No. alt="" is correct for purely decorative images. Informative images need descriptive alt.

Q: Are CSS background images checked?

No. This pass covers HTML img/src and data-src only.

Q: Who runs alt audits?

Content ops, a11y reviewers, and SEO teams after media migrations and theme changes .

Q: What coverage percent means?

Share of images with non-empty, non-filename alt text over total inventoried images.

Q: How long should alt be?

Keep informative alts concise — roughly under 125 characters ; put long captions in nearby text.

Q: How does this differ from SEO audit?

SEO audit summarizes alt coverage. This page is a full image inventory with per-URL evidence .

Inventory page images, measure alt coverage, and flag missing, filename, or overlong alt text.

Free · API · MCPToolYour platform

Use Image Alt Text Checker three ways

The free Image Alt Text Checker on this page works in your browser. The same workflow is available via REST API for apps and via MCP for Cursor, Claude, and other agents — one API key, one plan, one quota. This tool is part of the seo-apis module under Digital Tools.

Free in browserUse Image Alt Text Checker here — no account required.
REST APICall from your server with X-Api-Key.
MCP for agentsConnect Cursor or Claude to ToolYour MCP with the same key.

1. Get an API keySign in and open Dashboard → API Keys (works for REST and MCP).
2. Call or connectUse the REST API from your server, or paste the MCP URL into your agent config.
3. Same qualityOutput matches the free web tool across all three surfaces.

Manage API keys MCP setup API reference Create free account

What is Image Alt Text Checker?

Missing or filename alts (IMG_3401.jpg) fail accessibility and waste image context for search. CMS imports often copy the file name into alt. Decorative images incorrectly get long keyword alts; informative images ship with no alt at all.

This Image Alt Text Checker inventories img tags (including data-src), scores meaningful alt coverage, and flags missing attributes, empty decorative candidates, filename-like alts, and overlong text — with a prioritized evidence table.

Use it on product galleries, blog templates, and after bulk media migrations.

What are common questions about Image Alt Text Checker?

What problem does the alt checker solve?

It lists images with missing, empty, filename, or overlong alt text so you fix accessibility and image SEO context.

Is empty alt always wrong?

No. alt="" is correct for purely decorative images. Informative images need descriptive alt.

What is a filename-like alt?

Alt that matches a media filename or ends in common image extensions — usually a CMS import default.

Are CSS background images checked?

No. This pass covers HTML img/src and data-src only.

Who runs alt audits?

Content ops, a11y reviewers, and SEO teams after media migrations and theme changes.

What coverage percent means?

Share of images with non-empty, non-filename alt text over total inventoried images.

How long should alt be?

Keep informative alts concise — roughly under 125 characters; put long captions in nearby text.

How does this differ from SEO audit?

SEO audit summarizes alt coverage. This page is a full image inventory with per-URL evidence.

What are the key features of Image Alt Text Checker?

Full image inventory

Lists src, alt, lengths, and decorative suspects up to a capped table.

Missing alt detection

Flags img tags with no alt attribute.

Filename alt catch

Detects alts that look like IMG_1234.jpg import defaults.

Coverage scoring

Reports meaningful-alt percentage with documented formula.

Long alt warnings

Highlights alts over ~125 characters.

Prioritized fixes

Ranks missing alts above decorative empty-alt reviews.

How do you use Image Alt Text Checker?

Enter the page URL

Paste a gallery, product, or article URL rich in images.

Run the alt checker

Inventory images and score coverage.

Fix missing and filename alts first

Update CMS media fields; leave true decorative images as alt="".

Why alt text still matters for SEO and a11y

Alt text is required for non-text content under WCAG-style accessibility practice and supplies textual context when images fail to load. Search systems use available text cues around images; filename alts add noise, not meaning.

Use cases: ecommerce, blogs, migrations

Product grids — Confirm each SKU image describes the product, not sku-red-01.webp.

Editorial imports — Writers paste from Docs with empty alts; catch them before publish.

DAM migrations — After bulk upload, filename defaults flood alt fields.

Continue performance image work on Page Speed Analyzer.

Limitations

Does not crawl external CSS files for background images or execute JS galleries. Srcset candidates beyond primary src/data-src are not fully expanded in v1.