Does resizing upload my image anywhere?
No. The image is decoded and resized entirely in your browser using a canvas, so it never leaves your device.
How do I resize without distorting the image?
Keep "Lock aspect ratio" checked in dimensions mode, or use percentage mode, and the width and height scale together.
Which output formats are supported?
You can export the resized image as PNG, JPEG, or WebP, with a quality slider for JPEG and WebP.
Does resizing an image make the file smaller?
Yes, and more than anything else. File size scales with the pixel count, so halving the width and height quarters the number of pixels. It beats any compression setting in any format.
Should I resize before or after compressing?
Before, always. Compressing first and then resizing throws most of the work away, because you spent effort encoding pixels you were about to delete.
Can I make a small image bigger without losing quality?
No. Upscaling invents pixels that were never captured, so the result is always softer than the original. No tool can recover detail that does not exist.
How do I resize without distorting the image?
Keep the aspect ratio locked. Changing width and height independently squashes or stretches the picture, and it is far more obvious to everyone else than it is to you.
What size should a web image be?
The size it is displayed at, and no larger. An image shown in a 600px column gains nothing from being 3000px wide except the bandwidth it costs on every single page load.