Convert Advanced Systems Format (.asf) 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 .asf 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.
ALAC (Apple Lossless Audio Codec) compresses PCM audio to roughly 50-60% of its original size without any quality loss. ASF files carrying WMA or WMA Lossless audio can be converted to ALAC, giving you bit-perfect decoded audio in a format natively supported by every Apple device — iPhone, iPad, Mac, Apple TV, and HomePod.
ALAC is the only lossless codec natively supported across the entire Apple ecosystem without third-party apps. If you have ASF audio files and use Apple devices, ALAC provides the best combination of quality preservation and storage efficiency. Unlike AIFF or WAV, ALAC compresses losslessly, saving 40-50% of disk space while sounding identical to the uncompressed source.
The ASF container is parsed to extract the WMA audio stream, which is decoded to PCM. The PCM samples are then encoded with Apple's ALAC codec and packaged in an M4A (MPEG-4 Audio) container. Bit depth (16 or 24-bit) and sample rate are preserved. ALAC achieves roughly 50% compression on typical audio material through linear prediction and entropy coding.
ALAC is mathematically lossless — the decoded ALAC output is bit-identical to the PCM input. Any quality limitations come from the original WMA encoding. If the source was WMA Lossless, the entire chain from ASF to ALAC is lossless. If the source was standard WMA (lossy), the ALAC preserves exactly what WMA decoded to.
| Device | ASF | ALAC |
|---|---|---|
| Windows PC | Partial | 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
Converting ASF to ALAC delivers lossless audio in Apple's preferred format, making it the smartest choice for anyone moving a Windows Media audio library to Apple hardware.
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A fajlok feldolgozas utan automatikusan torlodnek
Regisztracio nem szukseges
Azonnal kezdhet konvertalni
Mindenhol mukodik
| No |
8MB free, 50MB Nitro
Barmely bongeszo, barmely eszkoz
| Jellemzo | ASF | ALAC |
|---|---|---|
| Teljes nev | Advanced Systems Format | Apple Lossless Audio Codec |
| Kiterjesztes | .asf | .m4a |
| Leginkabb ajanlott | Streaming optimized | Lossless |