Work out image optimisation savings instantly with clear inputs, formula shown and shareable results.
Savings are applied as the typical size reduction for the target format at visually equivalent quality, then multiplied by the number of images on the page. AVIF roughly halves JPEG weight but encodes slowly, which is why WebP remains the pragmatic default for large image libraries.
New weight
new KB = original KB x (1 - typical saving)
Page saving
total saved = saving per image x number of images
new KB = original KB x (1 - typical saving). Savings are applied as the typical size reduction for the target format at visually equivalent quality, then multiplied by the number of images on the page.
AVIF roughly halves JPEG weight but encodes slowly, which is why WebP remains the pragmatic default for large image libraries.
Enter current image weight, target format, images on the page. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.