CONVERT
AAC → AMR
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Fast, secure AAC to AMR conversion. No registration required.
Why this pair exists — AAC is the Advanced Audio Codec, more efficient than MP3 and ubiquitous in modern streaming. Ergo, the AMR route. Turn your AAC audio into a widely-supported AMR file. The conversion happens server-side through FFmpeg — the same engine behind every major audio editor — so the output plays cleanly on phones, car stereos, DJ software and streaming tools. Worth knowing: AAC is the Advanced Audio Codec, more efficient than MP3 and ubiquitous in modern streaming. Meanwhile AMR is the narrowband speech codec built for mobile voice recordings and 3G calls.
AAC Audio
Source formatAAC is a lossy audio codec that delivers better sound quality than MP3 at similar bitrates. It is the default audio format for Apple Music, YouTube, and most streaming services.
AMR Audio
Target formatAMR (Adaptive Multi-Rate) is an audio format optimized for speech, used in phone calls.
Why convert AAC to AMR
The motivation for a AAC → AMR conversion is almost always practical: a playback device, hosting platform or editing suite that insists on AMR. The audio quality trade-off is controllable via bitrate; the compatibility win is immediate and unambiguous.
HOW TO CONVERT
AAC → AMR
Give us the AAC
Select a AAC (or several for batch). We read the header to pick decoder settings automatically.
Re-encode to AMR
The audio is decoded, optionally resampled, and re-encoded as AMR at transparent default bitrate.
Retrieve your AMR
Grab the download as soon as it is ready. Typical jobs finish in seconds for short clips.
Common Use Cases
Share across platforms
Send AMR files to anyone without worrying about whether they have the right software for AAC.
Embed in documents
Drop AMR output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
AMR often produces smaller files than AAC for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
AAC vs AMR — Strengths and limitations
What each format does best, and where it falls short.
AAC Strengths
- Better quality than MP3 at equal bitrate — the industry standard since 2000s.
- Universally supported on every smartphone, OS, and browser.
- Efficient on battery thanks to widespread hardware decoding.
- Scales from 8 kbps speech (HE-AACv2) to lossy-transparent 320 kbps.
- Five-channel + LFE surround support out of the box.
Limitations
- Patent-encumbered — encoders have licensing fees, which is why open alternatives (Opus, Vorbis) exist.
- Slightly more complex to encode than MP3.
- Raw .aac streams carry no seek index — tooling often prefers M4A/MP4 containers.
AMR Strengths
- Extremely low bitrate — 4.75-12.2 kbps for speech.
- Designed for error-prone mobile channels — handles packet loss gracefully.
- Tiny file sizes — hours of voice in a few MB.
- Mandatory codec in all 3G/UMTS phones — universal cellular compatibility.
Limitations
- Speech-only — music sounds distorted.
- Narrowband (8 kHz sample rate) — muffled compared to modern codecs.
- Patent-encumbered until recently — licensing fees slowed adoption outside telephony.
AAC vs AMR — Technical specifications
Side-by-side comparison of the technical details.
AAC
- MIME type
- audio/aac
- Extensions
- .aac, .m4a, .mp4 (container-dependent)
- Standard
- ISO/IEC 14496-3
- Variants
- AAC-LC, HE-AAC, HE-AACv2, AAC-LD, xHE-AAC
- Sample rates
- 8-96 kHz
AMR
- MIME type
- audio/amr
- Extensions
- .amr, .3ga
- Standard
- 3GPP TS 26.071 (narrowband), TS 26.171 (wideband)
- Sample rate
- 8 kHz (AMR-NB); 16 kHz (AMR-WB)
- Bitrates
- 4.75, 5.15, 5.9, 6.7, 7.4, 7.95, 10.2, 12.2 kbps
| Specification | AAC | AMR |
|---|---|---|
| MIME type | audio/aac | audio/amr |
| Extensions | .aac, .m4a, .mp4 (container-dependent) | .amr, .3ga |
| Standard | ISO/IEC 14496-3 | 3GPP TS 26.071 (narrowband), TS 26.171 (wideband) |
| Variants | AAC-LC, HE-AAC, HE-AACv2, AAC-LD, xHE-AAC | — |
| Sample rates | 8-96 kHz | — |
| Sample rate | — | 8 kHz (AMR-NB); 16 kHz (AMR-WB) |
| Bitrates | — | 4.75, 5.15, 5.9, 6.7, 7.4, 7.95, 10.2, 12.2 kbps |
AAC vs AMR — Typical file sizes
Approximate file sizes for common scenarios.
AAC
- Speech podcast (64 kbps) 1 MB/min
- 3-min music track (128 kbps) 3 MB
- 3-min music track (256 kbps) 6 MB
- Broadcast-quality 5.1 (384 kbps) 9 MB for 3 min
AMR
- 1-min voice memo 45-90 KB
- 1-hour voicemail archive 3-5 MB
Quality & Compatibility
The AMR output is as good as the AAC source allows. If the AAC was encoded at 96 kbps, the AMR cannot reconstruct detail the encoder already dropped; picking a very high AMR bitrate just produces a larger file. Match AMR bitrate to the AAC quality for the best balance.
Tips for Best Results
- Sample-rate mismatches between AAC and target device (48 kHz phone output from a 44.1 kHz track) are handled automatically; no manual resampling needed.
- For audiobook delivery, match the platform spec exactly — ACX requires 192 kbps CBR 44.1 kHz stereo, for example.
- Batch-convert an album in one job so every track shares identical encoder settings and loudness normalisation.
Frequently Asked Questions
Lossy-to-lossy conversions (most combinations) re-compress the audio, which technically introduces some loss. At a 192 kbps or higher target it is inaudible on normal equipment. Lossy-to-lossless conversions freeze the existing quality but cannot improve it; lossless-to-lossy transcodes are only as good as the target bitrate you choose.
For voice content (podcasts, audiobooks, lectures) 128 kbps is indistinguishable from higher bitrates. For music, 192-256 kbps covers most listening; 320 kbps is the ceiling for AMR and the right choice for audio you plan to edit further. Above that, prefer a lossless target instead.
Yes. Title, artist, album, year and cover art travel from the AAC container to the AMR container automatically where both formats support them. If a tag field has no AMR equivalent, it is dropped silently. Use any tag editor (Mp3tag, MusicBrainz Picard) to fine-tune afterwards.
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Read guideSecure & Private Conversion
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