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This article recommends free merge partition software - EaseUS Partition Master Free Edition (Freeware) - to teach you how to merge partitions.
For data security, download a backup freeware to backup partitions before merge operation.
Tip: System partition and boot partition can only be set as destination, the same to the partition installed EaseUS Partition Master.
EaseUS Partition Master can not merge two non-adjacent partitions directly. Follow the below steps to easily merge two non-adjacent partitions.
Case 1. There are unallocated space between two partitions.
If these two partitions are separated by unallocated space, you can still follow the method to merge two neighboring partitions. The unallocated space will be added into the final merged partition.
Case 2. There are other partitions stuck in the middle.
Method 1. You can copy the partition in the middle to unallocated space, and then delete the partition and merge the other two partitions the same as you merge two neighboring partitions.
Method 2. You can merge these three partitions together by merging twice.
If you merge two partitions with different file system, the merged partition file system will be set as the more advanced partition file system. So you don't have to format your partition to change its file system. You can merge partitions to convert partition file system without data loss.
You can shrink one partition to set aside some unallocated space. And create a new partition with the more advanced file system. Then you merge these two partitions, you can get a final partition with more advanced file system.
Besides merge partitions (free download). It also provides features for dynamic disk management. You can resize dynamic volume to extend or shrink the volume capacity. Or you can convert dynamic disk to basic without data loss.