SEO & Performance
Image Savings Calculator
Add an image, choose a target width and format, and see the real transfer savings across your page views. The image is resized and re-encoded in your browser — nothing is ever uploaded.
Your image
local onlyNo image yet
Add an image to see its details and calculate savings.
- Dimensions
- —
- Format
- —
- File size
- —
Your image is decoded and re-encoded with JavaScript inside this page. It is never sent anywhere.
Optimize
liveAdd an image to choose a target width.
Modern formats like WebP and AVIF usually save the most.
Lower quality means a smaller file. 80 is a good balance for photos.
How many times this image is served. Used for the transfer totals.
Savings
waitingAdd an image to calculate transfer savings.
Format comparison
measured in your browser| Format | Output size | Savings | Select format |
|---|
No formats measured yet
Add an image and each supported format is encoded here so you can compare.
How it works
Your image is decoded with the browser’s own image APIs and drawn onto a canvas at the target width. Each supported format is then re-encoded and measured, so the sizes you see are real output from your browser’s encoder rather than a guess. Savings are the difference between that output and your original file, multiplied by your page views. Larger images take a moment to encode. Everything runs locally.