Convert Windows Media Video (.wmv) to MPEG-4 Audio (.m4a) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .wmv 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 .m4a file when it's ready.
WMV files store audio using WMA codecs inside Microsoft's ASF container — a format that Apple devices cannot decode natively. M4A is the standard MPEG-4 audio container used by iTunes, Apple Music, and every iOS/macOS device, containing either AAC (lossy) or ALAC (lossless) audio. Converting WMV to M4A extracts the audio track from Microsoft's ecosystem and packages it in Apple's standard, providing native compatibility with iTunes, iPhone, iPad, Mac, Apple Watch, and HomePod.
WMA audio from WMV files is inaccessible on Apple devices without third-party apps. M4A is the native audio format for the Apple ecosystem — it integrates with iTunes Match, Apple Music, Apple Podcasts, iCloud Music Library, Siri, and every Apple device. If you have WMV recordings with audio content you want to use on Apple platforms, M4A is the direct path to native compatibility.
FFmpeg opens the ASF container, decodes the WMA audio to PCM, and re-encodes to AAC-LC (lossy, 128–256 kbps) or ALAC (lossless) in an M4A container. The M4A format supports iTunes metadata atoms (title, artist, album, artwork, genre, year, track number) and chapter markers. Sample rate is preserved (typically 44.1 or 48 kHz).
AAC at 256 kbps in M4A is considered transparent — matching Apple's iTunes Store quality standard. Since WMA is being transcoded to AAC (lossy to lossy), set the AAC bitrate at or above the original WMA bitrate to minimize generational loss. If the WMV has WMA Lossless audio, choosing ALAC inside M4A preserves perfect quality.
| Device | WMV | M4A |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
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
WMV to M4A conversion moves audio from Microsoft's proprietary world into Apple's native ecosystem. The M4A output works seamlessly with every Apple product and service, from iTunes to HomePod.
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| No |
8MB free, 50MB Nitro
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| Funktion | WMV | M4A |
|---|---|---|
| Fulde navn | Windows Media Video | MPEG-4 Audio |
| Filendelse | .wmv | .m4a |
| Bedst til | Windows native | Better than MP3 |