hi

i'm trying to resize a 300x300 avatar into a horse avatar.

and i have no idea how to resize in bytes. (100000 bytes)

Advice?

(i cannot download or buy anything form app store just so you know)

I just google image compressor to make it fit the byte limit, and most art programs can resize for you. You can also google image resizer. Keep in mind that when resizing or compressing you lose quality. I would not suggest resizing a 1000x1000 px image to 300x300 px.

For banners, try not to resize at all, and instead just make the canvas the right size (or crop it to the right size)