Media Processing
M4S Converter
A local M4S to MP4 tool for Android, iOS, and HarmonyOS with batch scan, audio-video merge, and gallery save.
Android
iOS
HarmonyOS
A local M4S to MP4 tool for Android, iOS, and HarmonyOS with batch scan, audio-video merge, and gallery save.
Turn .m4s, video.m4s, or audio.m4s fragments into more portable MP4 or audio results.
Merge separate audio.m4s and video.m4s files into one synchronized MP4, with manual select and batch pairing.
Authorize a scan scope, discover local M4S files, batch pair multiple audio-video sets, and manage the pending queue.
Available on Android, iOS, and HarmonyOS — one experience across all your devices.
Keep conversion records, customize output naming, and save MP4 results to the system gallery.
Process authorized local video and audio files on device without uploading personal files.
M4S Converter is a local file tool for user-authorized M4S files. It scans .m4s files on device, identifies audio and video tracks, pairs matching fragments, and exports MP4 without uploading files.
Scan, identify, and export .m4s files on device. The app does not provide streaming or online content retrieval.
When a related local media set has separate audio and video tracks, the app can pair them locally before export.
Process multiple local M4S sets and keep output locations easier to understand.
Files stay on device. Only process local files you own or have permission to use.
Use M4S Converter when you have local .m4s files and want to export MP4 on device.
If a related local file set includes audio.m4s and video.m4s, confirm you have permission before pairing and exporting.
Use FFmpeg when you need advanced codec parameters, scripts, or desktop batch workflows.
Only process local files you own or have permission to use.
Best for: Local M4S file processing on Android, audio.m4s/video.m4s pairing, M4S to MP4
Strength: Local scanning, batch pairing, MP4 export, gallery save, no file upload
Limit: Focused on user-authorized local M4S files; not a content online content retrieval tool or streaming tool
Best for: Occasional small files
Strength: No app install
Limit: Requires upload and is weaker for privacy or batch pairing
Best for: Technical users and desktop automation
Strength: Powerful and scriptable
Limit: Command-line setup is harder for ordinary phone workflows
M4S is often a segmented media file, so a single file may not be a complete video. M4S Converter can process local .m4s files on device and export paired audio and video tracks as MP4.
audio.m4s usually refers to an audio track fragment, while video.m4s usually refers to a video track fragment. Only related files in an authorized local scope should be paired.
No. The app is designed for on-device local file processing and does not upload user audio or video files.
No. It only processes local files that the user selects or authorizes. It does not provide streaming or online content retrieval.
A local M4S to MP4 tool for Android, iOS, and HarmonyOS with batch scan, audio-video merge, and gallery save.