Website Image Analyzer

Images are one of the most common reasons websites load slowly, and a slow website loses visitors fast. This free tool checks every image on any page of your website and flags anything that might be weighing your site down.

Enter your URL below to check the images on your website:

How to Use the Image Analyzer

Enter the full URL of any page on your website and click Analyze Images. The tool will check every image on that page and flag any that are over 300KB, which is a common threshold for images that may be slowing your site down.

Your results will show you each image’s file name and size. Images over 300KB are flagged so you know exactly which ones need attention. If all your images look good, you’ll see a green checkmark confirming everything is within range.

Once you know which images need work, a free tool like Squoosh makes it easy to compress them before re-uploading. For a full walkthrough on optimizing your images, check out the post How to Speed Up Your Website by Fixing Your Images.

questions + answers

What’s a good image file size for a website?

For most website images, under 200KB is a solid target. Hero images or large background images can be a bit larger, but anything consistently over 300KB is worth optimizing.

What image formats work best for websites?

WebP is the best format for most website images in 2026 – it produces smaller file sizes with great quality. JPEG works well for photos and PNG is best for images that need a transparent background.

How do I fix images that are too large?

Check out the post How to Speed Up Your Website by Fixing Your Images for a step-by-step walkthrough on optimizing your images without losing quality.

Why does my image show as “Unknown” size?

Some images use lazy loading, which means they only load when a visitor scrolls to them. The analyzer sees the placeholder instead of the actual image file, so the size shows as Unknown. These images aren’t being skipped, they just load differently than standard images.

How often should I check my images?

Any time you add new images to your website is a good time to run a quick check. It’s also worth testing after a redesign or if you notice your site feeling slower than usual. If you add images to blog posts regularly, be sure to check the file sizes before you hit publish – it’ll save you more work later!