OTG Master

OTG Master lets you mount VeraCrypt, LUKS and BitLocker-encrypted USB drives, and read Mac APFS drives, directly on your Android device — no root required.

Connect an encrypted volume via USB OTG, enter your password or use your fingerprint, and access your encrypted files through Android's built-in Files app. Unmount safely when done.

FEATURES
• Multiple Encryption Formats — mount VeraCrypt, LUKS1, LUKS2 and BitLocker volumes (BitLocker with its password or 48-digit recovery key)
• Broad File System Support — read and write files on FAT32, exFAT, NTFS and ext4 partitions
• Mac Drives — read APFS drives, unencrypted or encrypted with a password, case-sensitive or not
• Read-Only Mode — optionally mount partitions safely without risking accidental modifications
• ext4 Repair — a drive that wasn't unmounted cleanly opens read-only; one tap replays its journal, as Linux would, and makes it writable again
• Auto Mount — automatically unlocks known drives on connect using biometric authentication
• Hub Support — multiple USB drives connected via a hub are all prompted in a single biometric step
• Keyfile Support — use a keyfile in addition to or instead of a password
• Custom PIM — supports non-default PIM values for stronger key derivation
• Cipher Selection — AES, Serpent and Twofish, VeraCrypt's five cascades of them, and SHA-512 or Argon2id key derivation
• Encrypt a Drive — turn a USB partition into a new VeraCrypt volume, with any of those ciphers, a PIM and keyfiles, or a LUKS2 volume for Linux; FAT32, exFAT, ext4 or NTFS inside
• Format — erase a partition in place as FAT32, exFAT, ext4 or NTFS, keeping its encryption and password
• Backups — back up folders between the phone and a drive, as plain copies or incremental snapshots in the standard restic format that restic opens on a computer; browse a backup as a read-only drive; reminders when one is overdue
• Recover Deleted Files — find files deleted from FAT32 and exFAT drives and copy them to the phone; only deleted files are listed, and nothing is written to the drive
• Phones and Cameras — another phone or a camera connected over USB shows up as a drive (read-only)
• Tablet Layout — on a wide screen, mounted drives sit beside the unlock form
• Partitioned Disks — scans MBR/GPT partition tables and lets you pick the exact volume to unlock
• No Root Required — works on standard, unmodified Android devices
• No Cloud, No Tracking — your files never leave your device

REQUIREMENTS
• Android 8.0 (Oreo) or later
• USB OTG cable or adapter
• A VeraCrypt, LUKS or BitLocker-encrypted USB drive, or an APFS drive from a Mac

OTG Master is free and open source.