OTG Master
• 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
The app reads raw sectors from the USB drive using the Android USB Host API, detects the encryption type on each partition, unlocks the volume, and exposes the decrypted filesystem through a standard Android DocumentsProvider — so other apps like Files or Gallery can browse the unlocked volume directly, just like any other storage location.
Supported encryption:
* VeraCrypt volumes — password, PIM, and/or keyfiles; AES and Serpent ciphers; SHA-512 key derivation
* LUKS1 volumes — PBKDF2-HMAC key derivation, AES-XTS bulk decryption
* LUKS2 volumes — Argon2id key derivation, AES-XTS bulk decryption
Supported filesystems:
* FAT32 and exFAT — full read/write access
* ext4 — full read/write access
Other features:
* Automatically detects and labels each partition as VeraCrypt, LUKS1, LUKS2, or unencrypted with colour-coded tags
* Support for multiple simultaneously attached USB drives, with a picker when more than one is detected
* Remembers credentials per device partition — re-mount in one tap
* Sends a structured diagnostic report to the support form (no data leaves without your review)
NTFS, HFS+, F2FS, and other filesystems are detected but not yet supported for mounting.
- Author: moylali
- License: GNU General Public License v2.0 or later
- Issue Tracker
- Source Code
- Build Metadata
- Reproducibility Status
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.
Download F-Droid-
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
-
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 12 MiB PGP Signature | Build Log
-
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 12 MiB PGP Signature | Build Log
• New: large exFAT drives now mount on devices that previously rejected them
• Fixed: the app no longer crashes while listing a folder with many thousands of files
• Fixed: the unlock form always appears now — it could previously go missing after an auto-mount prompt, leaving no way to unlock the drive
• Fixed: a mounted