Image Alt Text Checker (SEO + Accessibility Audit)

Audit a website for missing or low-quality image alt text.

This Actor crawls one or more pages, extracts all <img> tags, and flags common accessibility/SEO issues:

• Missing alt attribute
• Empty alt text (optionally ignored for clearly decorative images)
• Suspicious alt text (too short/long, generic like “image”, or filename-like)

It outputs:

• A dataset item per page with counts, examples, and warning/error lists
• A SUMMARY (key-value store) with aggregated totals
• A REPORT (key-value store) with a compact per-page overview

When to use

• SEO audits and technical site reviews
• WCAG/accessibility checks
• QA in CI/CD (monitor regressions in alt coverage)
• Content quality monitoring

Input

• startUrls (required): URLs to analyze
• followLinks: crawl a few internal pages (depth-limited)
• maxPages, maxDepth, sameDomainOnly: control crawl scope
• maxImagesPerPage: cap extracted images per page
• minAltLength, maxAltLength: heuristics for suspicious alt
• flagGenericAltText: flag generic alt like “image”, “logo”, etc.
• ignoreDecorativeImages: if alt="" and the image looks decorative (e.g., role=presentation), don’t flag it

Output

Dataset fields (per page)

• imageCount, imagesMissingAlt, imagesEmptyAlt, imagesSuspiciousAlt
• altCoveragePercent
• warnings, errors, issueSamples

Key-value store

• SUMMARY: aggregated totals and run settings
• REPORT: { summary, pages } (compact per-page report)

Example API input

{
  "startUrls": [{ "url": "https://example.com" }],
  "followLinks": false,
  "maxPages": 5,
  "maxImagesPerPage": 200,
  "flagGenericAltText": true
}

Quick start

Store page: https://apify.com/scrappy_garden/image-alt-text-checker

Paste this into Input and click Run:

{
  "startUrls": [
    {
      "url": "https://example.com/"
    }
  ],
  "proxyConfiguration": {
    "useApifyProxy": false
  }
}

Outputs (what you get)

• Dataset: Dataset items typically include fields like: url, statusCode, imageCount, imagesMissingAlt, imagesEmptyAlt, imagesSuspiciousAlt, altCoveragePercent, warningCount, errorCount.
• Key-value store: REPORT, SUMMARY

Tips (trust + predictable results)

• Start with 1–3 URLs to validate behavior, then scale up.
• If a target blocks requests, enable Proxy and/or slow down concurrency in Input.
• Use the SUMMARY / REPORT keys (when present) for automation pipelines and monitoring.

Related actors

• broken-link-checker (https://apify.com/scrappy_garden/broken-link-checker)
• canonical-url-checker (https://apify.com/scrappy_garden/canonical-url-checker)
• meta-tag-analyzer (https://apify.com/scrappy_garden/meta-tag-analyzer)
• security-headers-checker (https://apify.com/scrappy_garden/security-headers-checker)

Search keywords

image alt text checker, image alt text checker - find missing alt attributes for seo & accessibility, website audit, seo