Can I set the height instead?

Set the width and the height follows the original proportions. Distorting an image is almost never what someone wants, so it is not offered.

Can it make an image bigger?

It will, up to twice the original width, but it cannot invent detail that was never captured. Enlarging a small image makes it soft.

PNG and WebP keep it. Converting to JPG does not, because JPG has no transparency, so it is filled with white.

Give a width and the height follows, so nothing is squashed. Useful for getting a batch of photos down to one size before they go anywhere.

resize-imageLocal

Drop your files here

JPG, PNG or WebP, as many as you need

Width (px)

Can I set the height instead?: Set the width and the height follows the original proportions. Distorting an image is almost never what someone wants, so it is not offered.
Can it make an image bigger?: It will, up to twice the original width, but it cannot invent detail that was never captured. Enlarging a small image makes it soft.
What happens to transparency?: PNG and WebP keep it. Converting to JPG does not, because JPG has no transparency, so it is filled with white.