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

• VeraCrypt Hidden Volumes — open a hidden volume with its own password, and protect it from damage while writing to its outer volume

• 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.