Resizing

I’m looking for someone who can change the size of my drawings into tag format, ik how to but I can only seem to do it on the computer, and currently I’m out of town so I cannot use the computer until I get back which won’t be until 2 more weeks, so can anyone help me figure out how to resize it on mobile? Or would someone be willing to do it for me? (I can pay u) thank u!

Photopea.com technically works on mobile but it's browser and not built for mobile at all so it's quite cumbersome lol. 
Canvas and image resizing are under "Images" on the top.

I can do it for ya for free, shouldn't really be charging for resizing anyways. xD