I am making my profile picture in blender, and want to know the dimensions

Scratch profile pictures must be under 500x500 and the file size must be under 512 kilobytes.

I dare you to add this in the compositing tab

anyway to answer your question the resolution is 500x500. I would suggest setting the colour to 8-bit since that reduces file size

Thanks all!

Heres how it turned out if you would like to see https://scratch.mit.edu/projects/726805959/

Very nice!