best program for trim ds roms

Do you mean to lower the filesize? I often use 7-Zip to lower the size of DS Game ROMs plus others. I usually use the settings shown below:

compression-level-to-Ultra-How-to-Compress-Large-Files-to-Smaller-Size-10-GB-210-MB-Proof.png


EDIT: You can also use NDSTokyoTrim to lower filesize of your raw Nintendo DS game ROMs. Also supports GBA and 3DS game ROMs too.
 
yeah i meant lower the size , archiving the roms doesn't work since r4 - emulators don't read them , i will try this tokyotrim btw , thank you very much
 
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