Free image calculator 🖼️
Find out how much your images weigh in WebP 📉
Free image calculator 🖼️
Find out how much your images weigh in WebP 📉
Free image calculator 🖼️
Find out how much your images weigh in WebP 📉
Free image calculator 🖼️
Find out how much your images weigh in WebP 📉
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🖼️ Free calculator
Image Calculator
Measure how much your images weigh today and how much they'd weigh in WebP — a real comparison, made in your browser, not a generic estimate.
✓ 100% free · ✓ Real measurement, not estimated · ✓ Doesn't upload your files
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*Real per-image measurement made with Canvas in your browser. Images blocked by CORS are not counted in the savings.
Image Weight Estimator
If the page is on another domain, the browser may block reading it due to CORS. If so, paste the image URLs below.
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Note: each image is downloaded and re-encoded to WebP inside your own browser — no file is uploaded or stored on any server.
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Your results will appear here
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Analyzing images…
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Estimated savings by converting to WebP
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Estimated weight in WebP{{ totalWebpFmt }}
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Why does the weight of your images matter?
Page speed is a critical factor for Google ranking, and images usually account for more than 60% of a page's total weight.
Real measurement, not a table
This tool downloads each image and re-encodes it to WebP with Canvas, inside your browser — the savings you see are what you'd actually get.
Less weight, more speed
Fewer KB per image means faster loading, fewer visitors leaving and better Core Web Vitals scores.
Nothing gets uploaded
The whole process happens in your browser. Your images are not uploaded, stored or modified on any server.
Why use WebP?
WebP is a modern image format that offers superior compression, with and without loss. According to Google's data, lossless WebP images are 26% smaller than equivalent PNGs, and lossy WebP images are 25%–34% smaller than equivalent JPEGs, with similar visual quality.
Shopify and WooCommerce already serve WebP automatically in many cases, but it's worth reviewing your original images — the lighter the source file, the less work the CDN has to do.
Frequently asked questions
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Want to know if your store is ready to sell more?
Request a free audit and we'll tell you what's holding back your conversion, including loading speed. Audit my store for free
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