Convert WebM Video (.webm) to Mobile Video (.mobile-video) online for free. Fast, secure video conversion with no watermarks or registration.
Upload your .webm file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mp4 file when it's ready.
WebM is Google's open media container using VP8/VP9/AV1 video with Vorbis or Opus audio — the native format for browser-based video and YouTube delivery. The Mobile Video preset produces optimized MP4 with H.264 Baseline Profile and AAC audio, targeting the broadest possible mobile device compatibility across all brands, operating systems, and hardware generations.
While modern flagship smartphones can play VP9 WebM, the vast majority of the world's mobile devices cannot. Budget Android phones, older iPhones, feature phones, and portable media players lack VP8/VP9 hardware decoders. The Mobile Video preset produces H.264 content that every mobile device since 2008 can hardware-decode with optimal battery life and smooth playback.
Unlike device-specific presets (iPhone, Android, Kindle), Mobile Video targets the universal baseline — H.264 Baseline Profile Level 3.1 at 720p — guaranteeing playback on any mobile screen without knowing the recipient's device.
FFmpeg decodes VP8/VP9/AV1 video and Opus/Vorbis audio from the WebM container, then transcodes to H.264 Baseline Profile Level 3.1 with AAC-LC audio at 44.1 kHz stereo. Resolution is capped at 720p for universal mobile hardware decoder compatibility. Bitrate targets 1.5-3 Mbps for video and 128 kbps for audio. The output MP4 uses the faststart flag for instant playback over cellular networks. Baseline Profile is chosen over High Profile for maximum device reach.
H.264 Baseline Profile at 720p produces clean, sharp video on mobile displays up to 6.7 inches. VP9 is slightly more efficient than H.264, so the Mobile Video output may be marginally larger for identical quality (15-25%). However, the tradeoff is universal hardware-accelerated playback on every mobile device — no software decoding, no battery drain, no stuttering.
| Device | WebM | Mobile Video |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | Native |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
WebM to Mobile Video ensures web video plays on every mobile device in existence, trading VP9's efficiency edge for universal H.264 hardware decoder compatibility.
Sikker overførsel
HTTPS-krypterede uploads
Privatlivsfokuseret
Filer slettes automatisk efter behandling
Ingen registrering
Begynd at konvertere med det samme
Virker overalt
| No |
8MB free, 50MB Nitro
Enhver browser, enhver enhed
| Funktion | WebM | Mobile Video |
|---|---|---|
| Fulde navn | WebM Video | Mobile Device Video |
| Filendelse | .webm | .mp4 |
| Bedst til | Web optimized | Universal mobile |