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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.