Does this upload my image?

No. The image is read with FileReader and analyzed on a canvas inside your browser.

What is variance of Laplacian?

It is a computer vision method that measures edge strength. Sharper images usually have higher variance.

Free image tool

Upload a photo to estimate sharpness locally using a variance-of-Laplacian edge score.

Choose image

Select a JPG, PNG, or HEIC-supported browser image to begin.

Unblurry helps restore and improve soft images on iPhone.

Is the score absolute?

No. Different image sizes and subjects vary, but the score is useful for quick comparisons.

Can it detect motion blur?

It detects lost edge detail, which often comes from motion blur, camera shake, or missed focus.