SEO Image Audit Tool - Analyze & Optimize Website Images

The SEO Image Analyzer is a powerful Apify actor that automatically crawls and analyzes all images on a website to identify SEO optimization opportunities. It provides detailed insights into image-related issues that can impact search engine rankings and user experience.

Key Features:

• Comprehensive Image Detection: Extracts images from <img> tags and CSS background-image properties
• SEO Issue Detection: Identifies missing alt attributes, heavy images (>200KB warning, >500KB critical), and dimension problems
• Format Analysis: Detects non-optimized formats (JPEG/PNG that could be WebP/AVIF) and SVG images
• Multi-Page Crawling: Optional multi-page crawling with configurable limits
• Detailed Reporting: Generates per-page analysis and global site summary with issue counts and format distribution

Detected Issues:

• ALT_MISSING: Images without alt attributes (accessibility and SEO issue)
• HEAVY_WARN_KB: Images between 200 KB and 500 KB (performance warning)
• HEAVY_CRITICAL_KB: Images over 500 KB (critical performance issue)
• NON_NEXT_GEN: JPEG/PNG images that could benefit from WebP/AVIF format (if > 10 KB)
• UPSCALED: Images displayed larger than their natural size
• DOWNSCALED: Images displayed at less than 25% of their natural size

Output Format:

The actor generates a dataset with:

• One record per analyzed page with detailed image information
• A global site summary with aggregated statistics
• Threshold information for transparency
• Image metadata including size (bytes and KB), format, HTTP status, cache control, title, and caption

Example Output

Page Record:

{
  "type": "page",
  "pageUrl": "https://example.com",
  "title": "Example Page",
  "httpStatus": 200,
  "imagesCount": 3,
  "issuesCount": 4,
  "images": [
    {
      "imageUrl": "https://example.com/image.jpg",
      "alt": "Example image",
      "title": "Image title",
      "caption": "Image caption",
      "displayed": { "w": 800, "h": 600 },
      "natural": { "w": 1200, "h": 900 },
      "bytes": 245760,
      "bytesKB": 240,
      "format": "jpeg",
      "mime": "image/jpeg",
      "httpStatus": 200,
      "cacheControl": "public, max-age=31536000",
      "issues": ["HEAVY_WARN_KB", "NON_NEXT_GEN"]
    }
  ],
  "summary": {
    "altMissing": 1,
    "heavyWarn": 2,
    "heavyCritical": 0,
    "nonNextGen": 2,
    "upscaled": 0,
    "downscaled": 1,
    "byFormat": { "jpeg": 2, "png": 1 }
  }
}

Site Summary Record:

{
  "type": "site-summary",
  "pagesCrawled": 5,
  "imagesTotal": 47,
  "issuesTotal": 89,
  "topIssues": [
    { "type": "NON_NEXT_GEN", "count": 35 },
    { "type": "ALT_MISSING", "count": 12 },
    { "type": "HEAVY_WARN_KB", "count": 8 }
  ],
  "byFormat": { "jpeg": 25, "png": 18, "webp": 4 },
  "byProblem": {
    "ALT_MISSING": 12,
    "HEAVY_WARN_KB": 8,
    "HEAVY_CRITICAL_KB": 2,
    "NON_NEXT_GEN": 35,
    "UPSCALED": 5,
    "DOWNSCALED": 27
  },
  "byStatus": { "200": 45, "404": 2 },
  "thresholds": {
    "HEAVY_WARN": 204800,
    "HEAVY_CRITICAL": 512000,
    "HEAVY_WARN_KB": 200,
    "HEAVY_CRITICAL_KB": 500
  }
}

Perfect for SEO audits, website optimization projects, and performance analysis.