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Drop one DDS or two hundred. Batch conversion is not a paid feature here.
A game texture needs to be viewed or edited, and DDS opens in almost nothing outside the game modding tool chain.
DDS stores GPU-ready block-compressed data, usually BC1 to BC7. The blocks are decoded back to RGBA pixels and stored losslessly as PNG.
Block compression is lossy and was applied when the texture was built, so a DDS to PNG round trip does not give you the artist's original. Normal maps are worse: they often store data in swapped or reconstructed channels, so they look like garish blue and pink images because they are not colour at all.
Only the top level is converted. The smaller mip levels are pre-generated copies and PNG has nowhere to put them.
It is not a picture. It encodes surface direction in the colour channels, and some formats drop the blue channel entirely and reconstruct it on the GPU.
Drop one DDS or two hundred. Batch conversion is not a paid feature here.
Portable Network Graphics is lossless, so nothing is thrown away in the conversion.
Converted and deleted the moment it finishes. Never written to permanent storage.