Gparted is partition tools software, this software can create, manage, resize, format, delete partition, etc. This software available on archlinux repository.
To install it with Ntfs, fat32, reiser, xfs, nilfs support type like this below:
#pacman -S gparted gpart nilfs-utils jfsutils ntfsprogs reiserfsprogs xfsprogs
If you still didn't install polkit-gnome, install it to make gparted able to run directly from menu.
#pacman -S polkit-gnome
Here's Gparted User interface:
Here's more snapshot of gparted
|Resize & Move Partition|
|Format to another type of partition.|
Before applying your set up, make sure you partition is correct , to prevent lost data. If you sure then click on apply to change into your setup.