Convert tn1 to dds Online: tn12dds

You can use Tom's Editor to easily convert images from
Tiny Stuff .TN1 to Direct Show Surface .DDS.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

TN1

Tiny Stuff is an image format with extension TN1.

DDS

DDS are files invented by Microsoft to be used in games, mostly as textures. Images can be compressed to save space but the compression methods defined by DDS are all very fast in terms of coding and decoding.