Blur Image

It sets how strong the blur is, in pixels. A small radius softens fine texture; a large radius spreads each pixel far into its neighbours until the image is just smooth colour. Drag the slider and watch the live preview to pick the amount.

This tool blurs the entire image evenly. To obscure a single region — a face or a licence plate — crop that part out first, or cover it with a solid shape in an editor, since a selective blur is not offered here.

No. Blur can sometimes be reversed or read at low strength, so it is not a secure redaction method. For anything that must stay private, cover it with a solid opaque block rather than blurring it.

A blur averages each pixel with its neighbours, and at the border there are no pixels beyond the edge to average with, so the outermost band can lighten slightly. It is most visible at large radii.

Often yes for lossy formats — a blurred image has less fine detail, so JPG and WebP can compress it more. PNG may not shrink much. Use the image compressor if size is your main goal.

Yes for PNG and WebP; transparent areas stay transparent. JPGs have no transparency, so any clear regions become white.

JPG, PNG and WebP. The download keeps the same format you uploaded.

No. The blur is rendered in your browser with the Canvas API. Nothing leaves your device, and it works offline once the page has loaded.

Move the radius back to 0 for the original look, or reload the file with “Choose another”. The blur is only baked in when you download, and your source file is never changed.