This is one of the most direct and popular solutions for users specifically searching for the reverse operation. You can find the official releases on GitHub:
Below are the most reliable links and methods for converting your files. 1. Recommended Software Converters (PC) cia to 3ds file converter link
Regardless of the method chosen, remember the golden rule: If the target is an emulator like Citra, conversion is only half the battle; decryption is mandatory. Use the integrated tools or the dedicated decryption scripts to ensure your final .3DS file is playable. This is one of the most direct and
: Requires Python 3.9+ and supporting tools like makerom.exe and decrypt.exe in the same folder. conversion is only half the battle
file. You may need to press '3' for the menu and '6' to start the actual conversion.