OTG Master
• New: format FAT32/exFAT, keeping encryption
• New: VeraCrypt Twofish, cascades, Argon2id
• New: tablet layout; actions fit the width
• New: dropped drives stay listed; no-drive help
• New: repair ext4 needing recovery
• Fixed: slow writes and Serpent drives
• Fixed: FAT32 files could go missing
• Fixed: ext4 files showing deleted data
• Fixed: drives over 1 TB unrecognised
• Fixed: video stalls; freezes in big copies
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 (FAT32 or exFAT inside), with any of those ciphers, a PIM and keyfiles
• Format — erase a partition in place as FAT32 or exFAT, keeping its encryption and password
• 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.
- Author: moylali
- License: GNU General Public License v2.0 or later
- Issue Tracker
- Source Code
- Build Metadata
- Reproducibility Status
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Versions
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.
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arm64-v8aarmeabi-v7ax86x86_64This version requires Android 8.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 10 MiB PGP Signature | Build Log
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arm64-v8aarmeabi-v7ax86x86_64This version requires Android 8.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 20 MiB PGP Signature | Build Log
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arm64-v8aarmeabi-v7ax86x86_64This version requires Android 8.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 13 MiB PGP Signature | Build Log
• New: BitLocker, by password or recovery key
• New: Mac APFS, encrypted too, read-only
• New: App folder access survives remounts
• Fixed: LUKS2 4K sectors refused
• Fixed: slow ext4 deletes; ext2/3 read-only (writes damaged it)
• Fixed: FAT32 folders failed to open; write damage
• Fixed: exFAT drive names; deletes didn't free space
• Fixed: some phones couldn't read drives
• Fixed: Android 10 lost passwords after 4+ mounts
• New: ext4 filesystems are now supported for reading and writing, alongside FAT32 and exFAT
• New: On ext4 you can create files and directories, write and modify data, delete, and rename
• New: Read-only mode — mount an encrypted partition so nothing can be written to the drive. Choose per partition in the unlock form, or turn it on for all partitions in Settings
• New: The unlock form automatically detects whether a