How to Quickly Encrypt Files on Android
- Install Image Toolbox (it's free and open source)
- Launch the app and navigate to the Tools tab
- Choose Cipher from the tool list
- Pick any file from your device storage
- Keep Encryption toggle selected
- Enter a password in the Key field
- Keep default AES/GCM/NoPadding algorithm
- Tap the Encrypt button and save your encrypted file
- If you want to decrypt the file just repeat the previous steps but choose Decryption instead of Encryption in step 5