Convert AMR to ALAC — Free Online Converter
Convert Adaptive Multi-Rate Audio (.amr) to Apple Lossless Audio Codec (.alac) online for free. Fast, secure audio conversion with no watermarks or registration.
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O převodu AMR na ALAC
AMR is a speech-only codec standardized by 3GPP for mobile telephony, encoding at bit rates as low as 4.75 kbps. ALAC (Apple Lossless Audio Codec) is a lossless compression format developed by Apple, capable of reducing PCM audio to about 50-60% of its original size without losing a single sample. Converting AMR to ALAC gives you an Apple-native lossless file that is smaller than AIFF or WAV while remaining perfectly reconstructible.
Proč převádět AMR na ALAC?
If you want an uncompressed-equivalent archive of a voice recording that plays seamlessly in Apple Music, iTunes, and all iOS/macOS apps, ALAC is the best choice. Unlike AAC, ALAC is mathematically lossless — you can decode it back to the exact PCM stream that came out of the AMR decoder. It is also smaller than AIFF/WAV, making it practical for archiving large collections of call recordings on Apple hardware.
Běžné případy použití
- Archive voicemail recordings in Apple Music with lossless quality
- Store phone interview files in iCloud without lossy re-compression
- Preserve voice evidence in a lossless format compatible with macOS forensic tools
- Build an Apple-native library of voice memos without quality loss
Jak to funguje
FFmpeg first decodes the AMR stream to PCM (8 kHz mono for AMR-NB, 16 kHz for AMR-WB), then compresses it with the ALAC encoder and wraps the result in an M4A container. ALAC compression on low-bandwidth speech data typically achieves 30-40% size reduction compared to raw PCM, though the file will still be much larger than the compressed AMR original.
Kvalita a výkon
ALAC is lossless — every sample decoded from the AMR source is perfectly preserved. The quality ceiling is determined by the AMR codec's original capture: 8 kHz narrow-band or 16 kHz wide-band. No additional artifacts are introduced.
Kompatibilita zařízení
| Device | AMR | ALAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Doporučená nastavení podle platformy
Spotify
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Apple Music
Resolution: N/A
Bitrate: 256 kbps
AAC format required
SoundCloud
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Podcast
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
Tipy pro nejlepší výsledky
- 1Use FLAC instead of ALAC if the files need to be accessible on non-Apple devices.
- 2Tag the ALAC file with metadata (date, caller, subject) in Apple Music for easy retrieval.
- 3For large voicemail archives, ALAC's lossless compression keeps files smaller than raw WAV/AIFF without sacrificing anything.
- 4Verify the sample rate after conversion — it should match the AMR source (8 kHz or 16 kHz), not 44.1 kHz.
Související převody
AMR to ALAC is the right conversion when you need bit-perfect archiving of voice recordings in the Apple ecosystem.
AMR vs ALAC
| Vlastnost | AMR | ALAC |
|---|---|---|
| Celý název | Adaptive Multi-Rate Audio | Apple Lossless Audio Codec |
| Přípona | .amr | .m4a |
| Nejlepší pro | Speech optimized | Lossless |