Help Uh, I try to upload my avatar but...

It keeps showing off as low quality for some reason. :/ It is happening to every PNG file I try to upload. I've tried getting it to tinypic first, but when I paste the link of the avatar into the box, it says that the file is too large which, imo, viewing everyone's avatars in here, it is clearly not. They are all 100x100 files, and they keep uploading in Low Q.
I've tried converting to .BMP but it won't allow that extension, .JPG simply makes quality even worse...

This is the avatar I am attempting to upload;



As you can see in my current avatar box, it is the same one, just in way worse quality.

Any help I could receive? D: Sorry if this was an extremely noobish question, or something.

Thanks in advance.

 

Try saving it as a GIF? Otherwise I'm not sure...

 

Oh, look. It worked!

<:

Haha, thanks a lot.
This can be closed now, I s'pose.