Convert Adaptive Multi-Rate Audio (.amr) to Free Lossless Audio Codec (.flac) online for free. Fast, secure audio conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .amr 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 .flac file when it's ready.
AMR captures voice at telephony-grade quality using aggressive lossy compression standardized by 3GPP. FLAC (Free Lossless Audio Codec) is the open-source standard for lossless audio, compressing PCM data to roughly 50-60% of its original size with no quality loss at all. Converting AMR to FLAC creates a lossless archival copy of the decoded voice recording that any operating system or media player can handle.
FLAC is the gold standard for lossless audio on non-Apple platforms. Android, Linux, Windows (via built-in codec), and web browsers all support FLAC natively. If you need to preserve a voice recording exactly as the AMR decoder outputs it — for legal evidence, archival, or further editing — FLAC is the most widely compatible lossless option. It also compresses the PCM data, so files stay smaller than WAV.
FFmpeg decodes the AMR audio to 16-bit PCM at the native sample rate (8 kHz for AMR-NB, 16 kHz for AMR-WB), then compresses it with the FLAC encoder at compression level 5 (the default balance between speed and size). The resulting FLAC file can be decoded back to the exact same PCM samples.
FLAC encoding is mathematically lossless. The output quality is identical to what the AMR decoder produces — meaning 8 kHz narrow-band speech for AMR-NB, or 16 kHz wide-band speech for AMR-WB. No additional artifacts are introduced, and no information is discarded.
| Device | AMR | FLAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No |
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
AMR to FLAC is the ideal conversion when you need cross-platform lossless archiving of voice recordings.
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| No |
| ฟีเจอร์ | AMR | FLAC |
|---|---|---|
| ชื่อเต็ม | Adaptive Multi-Rate Audio | Free Lossless Audio Codec |
| นามสกุล | .amr | .flac |
| เหมาะที่สุดสำหรับ | Speech optimized | Lossless compression |