Free SEO Tool
Free Image Size Checker
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Enter a page URL to measure every image on it: file size, actual pixel dimensions, HTML width and height, type, and alt text.
Find the images that slow pages down
Images are often the heaviest part of a page. This checker reads the page HTML, finds each image (including lazy-load and srcset sources), asks the image server for its file size and loads it to measure the real pixel dimensions.
It flags images over 200 KB, images wider than 2000px, missing width and height attributes (which cause layout shift) and missing alt text.
Read from the Content-Length the image server reports.
Natural width and height measured in your browser.
Flags images without width and height attributes.
Counts images with no alt attribute.
About the image size checker
File size
Included
Read from the Content-Length the image server reports.
Real dimensions
Included
Natural width and height measured in your browser.
Layout shift risk
Included
Flags images without width and height attributes.
Alt text
Included
Counts images with no alt attribute.
How it works
Check images in three steps
Measure, sort out the heavy ones, then compress or resize.
01
Enter a page URL
Use a page with many images, such as a homepage or product page.
02
Measure every image
Sizes come from the image server; dimensions from loading each image.
03
Fix the heaviest
Compress, resize or convert the images flagged in the notes column.
Image checks for faster pages
The image problems that most often hurt page speed.
Thumbnail list
Each image with a preview, URL and type.
Size flags
Images over 200 KB are highlighted.
Dimension check
Actual size compared with the HTML width and height.
Missing attributes
Width, height and alt gaps called out per image.