@metin Looks nice.
I would also recommend XnConvert, which is free for personal use:
@mbt3d XnConvert is great indeed. I happened to have reinstalled it a few days ago. I converted lots of PSD bump textures to PNG, to make the file sizes more efficient.
@metin I did a few to WebP for online but it is an odd format that isn't supported too well on some OS's
The compression is good and Blender supports it too. PNG is safer though.