Convert MPEG Audio Layer 3 (.mp3) to Apple Lossless Audio Codec (.alac) online for free. Fast, secure audio conversion with no watermarks or registration.
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Click Convert and download your .m4a file when it's ready.
ALAC (Apple Lossless Audio Codec) is Apple's lossless compression format — it reduces file size by 40-60% compared to uncompressed AIFF or WAV while preserving bit-for-bit identical audio upon decoding. Apple uses ALAC for its Lossless Audio streaming tier on Apple Music, and every Apple device from iPhone to HomePod plays ALAC natively without third-party software. Converting MP3 to ALAC is ideal for Apple ecosystem users who want to archive their MP3 library in a lossless container.
The important caveat is that MP3 is already a lossy format. Converting MP3 to ALAC preserves the decoded MP3 audio losslessly — no additional quality is lost — but the resulting ALAC file cannot contain more audio information than the MP3 source contained. The value of this conversion is in having a lossless working copy that can be transcoded to any other format in the future without cumulative quality degradation.
ALAC is the only lossless format natively supported across all Apple devices — iPhone, iPad, Mac, Apple TV, HomePod, Apple Watch, and AirPods Max. If your audio library lives in Apple Music or iTunes, ALAC integrates seamlessly with iCloud Music Library and all Apple services. FLAC, while more universal, requires third-party apps on iOS and macOS for playback.
Converting MP3 to ALAC also makes sense as a format preservation strategy. If you are archiving a large MP3 collection, storing lossless ALAC copies ensures you never accumulate additional compression artifacts from future format conversions. Need to go from ALAC to AAC later? The transcoding starts from a lossless source rather than a lossy-to-lossy chain. The ALAC files will be larger than the original MP3s but significantly smaller than uncompressed WAV or AIFF equivalents.
FFmpeg decodes the MPEG Audio Layer 3 bitstream to raw PCM samples, then compresses them using the ALAC encoder into an M4A container (MPEG-4 Part 14 with .m4a extension). The ALAC codec is lossless — decoded PCM is bit-for-bit identical to the encoder input. Typical output for a 44.1 kHz stereo source is roughly 700-900 kbps, compared to the source MP3's 128-320 kbps. The ALAC file is larger than the MP3 because it preserves the full decoded PCM information without psychoacoustic shortcuts.
The conversion is lossless from the point of MP3 decoding onward. The ALAC output is a perfect representation of the decoded MP3 audio — no additional artifacts, rounding errors, or data loss occur. However, the quality ceiling is set by the MP3 source. A 128 kbps MP3 converted to ALAC will sound identical to the original MP3 because the information removed during MP3 encoding cannot be recovered. The advantage is purely in preventing further lossy re-encoding in the future.
| Device | MP3 | ALAC |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | Native |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
MP3 to ALAC conversion is the smart archival strategy for Apple ecosystem users. While it cannot improve upon the MP3 source quality, it creates a lossless copy that integrates perfectly with Apple Music, iCloud, and every Apple device — and prevents any additional quality loss from future conversions.
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| No |
| Jellemzo | MP3 | ALAC |
|---|---|---|
| Teljes nev | MPEG Audio Layer III | Apple Lossless Audio Codec |
| Kiterjesztes | .mp3 | .m4a |
| Leginkabb ajanlott | Universal compatibility | Lossless |