Audio Format Comparison

AMR vs AAC: Voice Recording Format vs Universal Audio Codec

AMR (Adaptive Multi-Rate) is a codec designed exclusively for voice — it was the standard format for phone call recordings and voice memos on older Nokia, Samsung, and Android phones. AAC is a general-purpose audio codec that handles voice, music, and all audio content efficiently. AMR files play on virtually nothing modern without conversion.

AMRvsAAC

Quick Verdict

Use AMR when…

Use AMR only if your device requires it — older Android phones and feature phones record in AMR and the format appears in legacy MMS attachments and voice recordings. You'll likely want to convert immediately.

Use AAC when…

Use AAC for voice recordings that need to play on modern devices, be shared via messaging apps, or be embedded in presentations. AAC at 64 kbps handles voice perfectly — small file, universally supported.

AMR vs AAC: Feature Comparison

Feature	AMR	AAC
Audio type	Voice only (optimized)	All audio (voice, music, etc.)
Bitrate range	4.75–23.85 kbps	16–320 kbps
Modern device support	Very limited	Universal
Browser support	None	All major browsers
Music quality	Poor	Excellent
File size	Very small	Small (at voice bitrates)
Smartphone recording	Legacy Android (pre-2013)	Current iOS and Android default

When AMR wins

✓Audio type: Voice only (optimized)
✓Bitrate range: 4.75–23.85 kbps
✓Modern device support: Very limited

When AAC wins

✓Audio type: All audio (voice, music, etc.)
✓Bitrate range: 16–320 kbps
✓Modern device support: Universal

Frequently asked questions

How do I play an AMR file on my computer?

On Windows: Windows Media Player may play AMR with a codec pack installed. VLC plays AMR on all platforms (free). On Mac: QuickTime does not open AMR; use VLC. The simplest solution is usually to convert AMR to AAC or MP3 using FFmpeg: `ffmpeg -i input.amr output.aac` or `ffmpeg -i input.amr output.mp3`. After conversion, the file plays in any media player.

Can WhatsApp or iMessage play AMR voice notes?

WhatsApp voice notes use their own encoding (typically Opus in .ogg container). AMR voice recordings from old phones are not directly attachable as WhatsApp voice notes. However, AMR files can be sent as file attachments in WhatsApp, where the recipient's phone can play them if AMR support is present. iMessage sends audio as AAC — AMR files would need conversion before sending.

Does converting AMR to AAC improve quality?

No — AMR is a lossy codec optimized for speech at very low bitrates (4–24 kbps). Converting to AAC at a higher bitrate doesn't recover quality that was already lost during AMR encoding. The AAC file will be larger but won't sound better. Converting is worthwhile for compatibility — so the file plays everywhere — but not for quality improvement.