Website Image Analyzer
See how much your images weigh and how to make them lighter. The analyzer measures the size and format of up to 60 images on a page and checks what matters for speed: modern formats such as WebP and AVIF, files over 200 KB, width and height attributes that prevent layout shifts, lazy loading for images further down, a first image that is not lazy-loaded, and srcset for smaller screens. A score sums it up.
- Encrypted connection
- No sign-up
- Free to use
How to use Website Image Analyzer
- Enter the page address.
- Click “Analyse images”.
- Read the score and checks.
- Optimise the images flagged.
Website Image Analyzer features
Total weight
All image bytes.
Formats
JPEG, PNG, WebP, AVIF, SVG.
Layout shift risks
Missing dimensions.
Lazy loading
First and later images.
Per-image findings
What to fix.
Safe fetching
Public addresses only, with size and time limits.
When to use Website Image Analyzer
- Speeding up heavy pages.
- Core Web Vitals work.
- Reviewing a new theme.
- Ecommerce product pages.
Website Image Analyzer FAQ
Why not lazy-load the first image?
The main image is often the Largest Contentful Paint; lazy loading delays it.
Why do width and height matter?
They let the browser reserve space, so the layout does not jump when the image arrives.
Which format should I use?
WebP for photos and graphics in most cases, AVIF for the smallest files, SVG for logos and icons.
Where are the sizes from?
From the servers’ responses for each image.
Images and page speed
Images are usually the largest part of a page. Converting to modern formats and serving the right size for each screen often halves the page weight.
The optimisers on this site convert and compress images in your browser.
How it works: our server downloads the page once through a guarded fetcher that only connects to public addresses, follows a limited number of redirects and stops after a size and time limit. The HTML is then analysed in your browser as inert text – scripts on the page never run and nothing is stored.
What it cannot see: content and resources that a page adds with JavaScript after it loads, pages behind a login, and servers that block automated requests. For those, open the page in your browser, use its developer tools, or paste the page source where the tool offers a paste option.
Use the results as a starting point: fix the items marked red first, review the yellow warnings in context, and run the check again after a change. Requests are rate-limited to keep the service fair; if you check many pages in a row, wait a few minutes.
Related checks on this site cover the rest of a technical review – speed and Core Web Vitals, security headers, structured data, accessibility and SEO signals – so you can work through a whole site audit one topic at a time.
Who it is for: site owners checking their own pages, developers debugging a release, SEO and marketing teams auditing clients or competitors, and students learning how the web works. No account or installation is needed, and the results are plain text and tables you can copy into a report or ticket.