Convert WebM Video (.webm) to Apple Lossless Audio Codec (.alac) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
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 .m4a file when it's ready.
WebM files contain Opus or Vorbis audio — high-quality open-source lossy codecs. ALAC (Apple Lossless Audio Codec) is Apple's lossless compression format, open-sourced in 2011, that compresses PCM to 50-60% size with zero data loss. ALAC integrates natively with Apple Music, iTunes, iPhone, iPad, and the entire Apple ecosystem.
Extracting WebM audio to ALAC creates a lossless archival copy that integrates perfectly with Apple devices. The ALAC output serves as a master from which any future lossy format (AAC, MP3) can be derived without cascading generation losses. This is valuable when building Apple Music libraries from web audio sources.
ALAC is also the format that displays the 'Lossless' badge in Apple Music, adding perceived quality to imported web audio.
FFmpeg decodes the WebM container's Opus or Vorbis audio to raw PCM, then encodes using the ALAC encoder into an M4A container. Output at 16-bit/44.1 kHz or 16-bit/48 kHz (matching the source). Compression achieves 50-60% of PCM size. The M4A container supports full iTunes-compatible metadata.
ALAC losslessly preserves every decoded sample. Since the source is lossy (Opus/Vorbis), the ALAC output contains the same quality — no better, no worse. The advantage is preventing further loss during future operations.
| Device | WebM | ALAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| 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 ALAC provides the ideal Apple-native archival format for decoded web audio, with lossless preservation and seamless ecosystem integration.
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Fungerar overallt
| No |
8MB free, 50MB Nitro
Valfri webblasare, valfri enhet
| Funktion | WebM | ALAC |
|---|---|---|
| Fullstandigt namn | WebM Video | Apple Lossless Audio Codec |
| Filandelse | .webm | .m4a |
| Bast for | Web optimized | Lossless |