Image Optimizer
Scan any web page for image optimization issues. Detect oversized files, missing alt text, lazy loading gaps, and opportunities to use modern formats.
Size analysisWebP/AVIF checkLazy loading~5 seconds
This tool analyzes the single URL you enter, not your entire website.
Analyzing... Scanning images for size, format, and optimization issues
What We Check
9 checks covering image weight, format efficiency, and accessibility.
Image Count
Number of images found on the page
Total Weight
Total image weight is within acceptable range
No Oversized
No individual image exceeds 200KB
Modern Formats
Images use modern formats (WebP or AVIF)
Lazy Loading
Below-the-fold images use lazy loading
Responsive Images
Images use srcset/sizes for responsive delivery
Alt Text
All images have descriptive alt attributes
Explicit Dimensions
Images specify width and height attributes
Image Optimization Score
Overall image optimization score
Frequently Asked Questions
Common questions about this tool.
What image format should I use?
For photographs, use WebP as the default with AVIF as a progressive enhancement for even better compression. For simple graphics, icons, and logos, SVG is ideal because it scales without quality loss. Use the picture element with source sets to serve modern formats to supporting browsers while falling back to JPEG or PNG.
How much can lazy loading improve performance?
Lazy loading can reduce initial page weight by 30-60% on image-heavy pages because below-the-fold images are not downloaded until the user scrolls near them. The native loading="lazy" attribute is supported by all modern browsers and requires no JavaScript library.
Why do images need width and height attributes?
Specifying width and height allows the browser to reserve the correct space before the image loads, preventing Cumulative Layout Shift (CLS). CLS is a Core Web Vital that directly affects your search ranking. Without dimensions, content jumps around as images load, creating a poor user experience.
Optimize Your Images
Find oversized images, missing alt text, and format opportunities to make your pages load faster.
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