Whether you need to shrink a photo for a website, resize an image for a form's upload limit, or scale something up for print, resizing shouldn't require installing an app or uploading your photo to a stranger's server. This tool resizes images locally using the browser's canvas engine, with an aspect-ratio lock so you don't accidentally distort your image.
Yes, HEIC files are decoded automatically, so you can resize an iPhone photo directly without converting it first.
Not if you keep the aspect-ratio lock on (the default). It automatically keeps width and height proportional as you type.
Yes, though keep in mind enlarging an image beyond its original resolution stretches existing pixels rather than adding real detail.