Image Alt Text Accessibility Auditor

Audit image alt text for WCAG accessibility compliance across any website. Missing or empty alt attributes are the most common accessibility violation on the web -- and they hurt both screen-reader users and your SEO rankings. Scan hundreds of pages in bulk and get an instant accessibility score with a detailed per-image breakdown of every issue.

Features

• Missing alt detection — flags every <img> tag with no alt attribute at all
• Empty alt detection — catches images with alt="" that may need descriptive text
• Accessibility score — calculates a 0-100 score per page based on the ratio of properly tagged images
• Lazy-load support — checks both src and data-src attributes to catch lazy-loaded images
• Full URL resolution — resolves relative image paths to absolute URLs for easy reference
• Bulk processing — scan hundreds of URLs in a single run with configurable concurrency
• Pay-per-event billing — you only pay for each page audited, with automatic charge-limit enforcement

Input

Field	Type	Required	Default	Description
urls	array	Yes	—	List of page URLs to audit for image alt text accessibility issues.
timeoutSeconds	integer	No	15	Maximum seconds to wait for each page response before timing out.
concurrency	integer	No	10	Number of pages to process in parallel. Increase for large batches, decrease if you hit rate limits.

Input Example

{
  "urls": [
    "https://crawlee.dev",
    "https://apify.com",
    "https://example.com"
  ]
}

Output

Each URL produces one dataset item with an accessibility score and a detailed image-by-image breakdown.

• inputUrl (string) — the URL you submitted
• finalUrl (string) — the URL after redirects
• status (number) — HTTP status code
• totalImages (number) — total number of <img> tags found on the page
• missingAlt (number) — count of images with no alt attribute
• emptyAlt (number) — count of images with empty alt=""
• accessibilityScore (number) — 0-100 score (percentage of images with valid alt text)
• images (array) — per-image details:
  • src (string) — resolved absolute URL of the image
  • alt (string | null) — the alt text value, or null if missing
  • issue (string) — "missing", "empty", or "ok"
• error (string | null) — error message if the URL could not be fetched

Output Example

{
  "inputUrl": "https://example.com",
  "finalUrl": "https://example.com/",
  "status": 200,
  "totalImages": 12,
  "missingAlt": 3,
  "emptyAlt": 1,
  "accessibilityScore": 67,
  "images": [
    {
      "src": "https://example.com/images/hero.jpg",
      "alt": "Product dashboard overview",
      "issue": "ok"
    },
    {
      "src": "https://example.com/images/banner.png",
      "alt": null,
      "issue": "missing"
    },
    {
      "src": "https://example.com/images/logo.svg",
      "alt": "",
      "issue": "empty"
    }
  ]
}

Pricing

Event	Cost
Page Audited	Pay-per-event (see actor pricing page)

The actor stops automatically when the per-run charge limit is reached, so you never overspend.

Use Cases

• WCAG compliance — audit your site for alt text violations before an accessibility review or legal deadline
• SEO improvement — search engines use alt text for image indexing; fix gaps to improve image search rankings
• Agency deliverables — generate accessibility reports for clients with per-page scores and specific remediation items
• Content QA — catch missing alt text in CMS-managed content before it reaches production
• Accessibility monitoring — schedule recurring runs to track your accessibility score over time

Related Actors

Actor	What it adds
Broken Links Checker	Finds broken links and images — combine with alt text auditing for a complete page quality check
OpenGraph & Twitter Card Inspector	Validates social preview tags — pair with accessibility auditing for full content QA
Website Tech Stack Analyzer	Detects the CMS behind each page — understand which platform is generating the accessibility issues