Can devils and jinn see human nakedness, and how can it be prevented when changing clothes or using the toilet?

Summary

Based on the general meaning of the Quranic verse, devils and jinn can see humans in all situations, including when undressing, bathing or relieving oneself in the toilet. One means of protection is reciting the basmalah when removing clothes or entering the toilet, based on hadiths from Anas bin Malik and Ali bin Abi Talib; the chain of Ali's hadith is not strong, but Imam al-Nawawi stated that weak hadiths may be acted upon in matters of virtuous deeds. A person should avoid exposing the awrah except where there is a need, even when alone. Covering it when alone is obligatory according to the Hanafi (the sound opinion), Shafii and Hanbali scholars, while the Maliki school holds it recommended.

Written in our own words from the original fatwa — check the source before acting on it.