Resize Image

Keeping the proportions right

The aspect ratio lock is on by default: change the width and the height follows, so faces and logos are never stretched. Unlock it only when you deliberately need an exact size such as a 1:1 avatar; for that, cropping first with Crop Image usually looks better than squashing.

Quality when scaling down and up

Downscaling uses multi-step resampling, which avoids the jagged edges and shimmering that a single big jump can cause. Upscaling cannot invent detail: an image enlarged more than about 4x will look soft because new pixels have to be interpolated. The maximum output is 10,000 x 10,000 pixels.

Common target sizes

Some sizes worth knowing:

• 1920 x 1080 (Full HD): full-width website banners and desktop wallpapers.
• 1280 x 720 (HD): blog images and video thumbnails.
• 1080 x 1080: square social media posts.
• 800 x 600 or smaller: email attachments and product listings where file size matters.

Private and fast

Resizing uses your browser's Canvas API, so images up to 100 MB are processed on your device and never uploaded. If the file is still too heavy after resizing, Compress Image reduces it further.