Image encoder for Slow-Scan Television (SSTV) audio signals
About this app
Modes
Supported SSTV modes:
• Martin Modes: Martin 1, Martin 2
• PD Modes: PD 50, PD 90, PD 120, PD 160, PD 180, PD 240, PD 290
• Robot Modes: Robot 36 Color, Robot 72 Color
• Scottie Modes: Scottie 1, Scottie 2, Scottie DX
• Wraase Modes: Wraase SC2 180
The mode specifications are taken from the Dayton Paper, JL Barber, "Proposal for SSTV Mode Specifications", 2000:
http://www.barberdsp.com/downloads/Dayton%20Paper.pdf
Image
To load an image:
• tap "Take Picture" or "Pick Picture" menu button, or • use the Share option of an app like e.g. Gallery.
To keep the aspect ratio, black borders will be added if necessary.
Original image can be resend using another mode without reloading.
After image rotation or mode changing the image will be scaled to that mode's native size.
After closing the app the loaded image will not be stored.
Text Overlay
Actions for working with text overlays:
• Single tap to add a text overlay.
• Single tap on text overlay to edit it.
• Long press to move text overlay.
• Remove the text to remove a text overlay.
After closing the app all text overlays will be stored and reloaded when restarting.
Menu
Available menu options:
• "Play": Sends the image
• "Stop": Stops the current sending and empties the queue
• "Pick Picture": Opens an image viewer app to select a picture
• "Take Picture": Starts a camera app to take a picture
• "Save as WAVE File": Creates a wave file in the Music folder in SSTV Encoder album
• "Transform Image":
• "Rotate": Rotates the image by 90 degrees
• "Reset": Resets image rotation and scaling
• "Modes": Lists all supported modes
Licensed under Apache-2.0.
What's New in v2.13
Imported from the F-Droid repository index.
Version history
May 29, 2025 · 2.6 MB · Android API 21–35 · code 34
Imported from the F-Droid repository index.
SHA-256 9598cf16a2e9f5bb369595400b996319363f4fb930e1728031fd1b99e10a4bfb
Jan 10, 2025 · 2.6 MB · Android API 21–35 · code 33
Imported from the F-Droid repository index.
SHA-256 51f352e70a668adbd337ef104034a9e79fc441f68bd2cc8c37513728461de32f
Aug 18, 2024 · 2.6 MB · Android API 21–34 · code 32
Imported from the F-Droid repository index.
SHA-256 135cffac7474b9fcd8c10f949cc43f63f30287bb0931951b6a0a8f00879a197f
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be om.sstvencoder is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 2.12 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall SSTV Encoder first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of SSTV Encoder, and a listing is removed when the evidence for it stops holding up.
Get SSTV Encoder
Every source we list for om.sstvencoder is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
9598cf16a2e9f5bb369595400b996319363f4fb930e1728031fd1b99e10a4bfb
Signing certificate
3fc4ab5783946bf046507d6a499c208fd45557aa4e86ee04e110ccf6869f66ad
Permissions Required
What each permission lets SSTV Encoder do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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