Online, "Smart" Partition Manager with Full Ext4 Support?

Solution 1:

Paragon Partition Manager 11 Free Edition is Windows-based, supports ext4 and is very easy to use .

Although claiming a smart resize/move wizard, I have no idea how smart it is on moving ext4 from its beginning, but being one of the best partition managers around it is certainly worth a try.

Another one that you could try is MiniTool Partition Wizard Home Edition 6.0, boasting two million users world-wide.

Please note that when resizing partitions, nobody can guarantee the results. The world's best products are always capable of destroying the disk. I always counsel taking an image of a disk before doing any partition work (using a 3rd-party product - use the problematic Windows Backup only if you have to).

Solution 2:

I am not too sure about editing it in Windows, but I would recommend using GParted's LiveCD/USB. Then you can just pop it in, edit what you need, then return without installing anything on your system.

Solution 3:

Paragon Hard Disk Manager 14 can resize/move Ext2, Ext3, Ext4 partition without damaging existing data.