Optical File Transfer v0.0.20
APK · 9 MB · version code 20 · Android 5.0+ · uploaded May 8, 2026
- Same certificate as the 2 other versions checked Details
Quick check before downloading
Answer this to unlock the download. It keeps automated downloaders away.
Compared with the latest version
The latest version is v0.0.23, uploaded May 14, 2026 — about 5 days after this one.
- Size: this file is 9 MB; the latest is 9.7 MB (649.5 KB larger).
- Both versions request the same permissions.
File information
- Version
- v0.0.20 (20)
- Uploaded
- May 8, 2026
- Size
- 9 MB
- Requires
- Android 5.0+ (API 21)
- CPU support
- x86 64-bit, ARM 32-bit, ARM 64-bit
- Graphics
- OpenGL ES 2.0+
- Screen
- Small screens and larger
- MD5
- 8c3d9658517c18fc297ff179b9fe11f7
- Signing certificate (SHA-1)
- B5:15:55:69:7E:79:D6:C3:95:28:8E:F3:FE:A6:AC:F4:68:C1:AA:BA
- Signed by
- CN=Pawel Wrobel, OU=Home, O=Home, L=Wroclaw, ST=Dolnoslaskie, C=PL
- File name
- pl-pwrobel-opticalfiletransfer-20-74679658-8c3d9658517c18fc297ff179b9fe11f7.apk
- Package
- pl.pwrobel.opticalfiletransfer
- Downloads (all versions)
- 5K+
- Age rating
- PEGI 3 · Everyone
What's new in v0.0.20
Improved file receiving stability, especially during brief system popups.
Improved startup when opening shared files from other apps.
Increased default QR payload size for faster transfers.
Updated privacy prompt, policy text, and translations.
Permissions (3)
This version requests 3 permissions, 2 of them sensitive.
- Access all files Sensitive android.permission.MANAGE_EXTERNAL_STORAGE
- Camera Sensitive android.permission.CAMERA
- Internal broadcast protection (app-defined) pl.pwrobel.opticalfiletransfer.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Security & authenticity
Security rating: Trusted
Signing certificate
- Certificate issued to “Home” Not the developer's name (“Paweł Wróbel”). Names in certificates can't be verified, so this alone proves nothing.
- Same certificate as the 2 other versions checked
Store checks
- Developer signature verified May 8, 2026
- Uploaded by “catappult” Platinum tier · 1,377 followers · uploading since 2018
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself.
How to install Optical File Transfer on Android 5.0+
You'll need about 18.1 MB of free space.
- Download the APK — tap Download APK above (9 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap pl-pwrobel-opticalfiletransfer-20-74679658-8c3d9658517c18fc297ff179b9fe11f7.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be 8c3d9658517c18fc297ff179b9fe11f7. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open Optical File Transfer — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 5.0+). Download it again, or pick an older version.
- “App not compatible with your device” — this build contains native code for x86 64-bit, ARM 32-bit, ARM 64-bit only. Devices with other processors can't install it.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.