Image Size Analyzer
Analyze the images on any webpage, compare their actual and displayed dimensions, and find opportunities to reduce image weight and improve page performance.
Understand Your Image Sizes & Optimization Opportunities
Image Size Analyzer checks the images used on a webpage, compares their actual dimensions with their displayed size, and shows where you can resize, optimize, or serve better image versions for faster loading.
Check Actual Image Dimensions
See the real width and height of each image found on your webpage and compare it with the size at which the browser displays it.
Find Oversized Images
Identify images that are much larger than their displayed dimensions and discover where smaller versions could reduce unnecessary downloads.
Get Practical Recommendations
Get suggested image dimensions, responsive image recommendations, format suggestions, and implementation guidance for each image.
How Image Size Analyzer Works
Enter a webpage URL and the analyzer examines the images available in the page HTML. It then compares image dimensions, display sizing, file size, formats, and responsive image settings to highlight potential optimization opportunities.
Enter URL
Add the webpage URL you want to analyze.
Extract Images
The analyzer finds image elements and their available sources.
Compare Sizes
Actual image dimensions are compared with detected display sizes.
Optimize
Receive practical suggestions for better image delivery.
What You Can Discover
Use the results to understand which images may be affecting page weight and where more efficient image delivery could help.
Oversized Images
Find large source images being displayed at much smaller sizes.
Undersized Images
Detect images whose intrinsic dimensions may be smaller than their displayed dimensions.
Missing Dimensions
Identify images without explicit width and height information.
Image File Size
Review the approximate downloaded size of individual images and the combined image payload.
Modern Formats
See whether JPEG or PNG images may be candidates for WebP or AVIF.
Responsive Images
Check for responsive image sources such as srcset and identify opportunities to serve better-sized resources.
Example Optimization
Source image dimensions
Approximate rendered dimensions
A more appropriate high-density source
Serving an appropriately sized image can reduce unnecessary image pixels and potentially reduce the amount of data downloaded by visitors. The exact best size depends on the image's rendered dimensions, device pixel density, responsive layout, and visual requirements.
Image Optimization Best Practices
Use appropriate dimensions
Avoid sending extremely large images when the layout only needs a smaller version.
Use responsive images
Use srcset and sizes where appropriate so browsers can select suitable image resources.
Add width and height
Explicit image dimensions help the browser reserve layout space and can reduce unexpected layout movement.
Choose efficient formats
Consider WebP or AVIF when they provide a meaningful size reduction for your images.
Find Image Optimization Opportunities
Analyze your webpage and see which images are oversized, undersized, missing dimensions, or could benefit from responsive image delivery.
Analyze • Compare • Optimize • Improve