AIFC to AMR Converter
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Supports: AIFC
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Need help?AIFC to AMR Converter
AIFC (AIFF-C) is Apple's audio container, usually holding uncompressed CD-quality PCM. AMR (Adaptive Multi-Rate) is a speech codec built for mobile telephony: narrowband AMR-NB records mono voice at an 8 kHz sample rate in a few kilobits per second. Converting AIFC to AMR is the right move when your source is spoken-word — a voice memo, dictation, or interview — and you want the smallest possible file for a phone or messaging app. For music, this is the wrong target; jump to the AMR-NB note below before you convert.
Is AMR Right for Your Audio? (Read This First)
AMR-NB is built for one job: making human speech intelligible at a tiny bitrate. The transcode is destructive by design — your AIFC is downmixed to mono, downsampled to 8 kHz, and band-limited to roughly 200–3400 Hz (telephone bandwidth). That is fine for a voice recording and disastrous for music: stereo collapses, cymbals and "air" above 3.4 kHz disappear, and the result sounds thin and muffled. If your AIFC is a song or any full-range audio, convert it to AIFC to MP3 instead, which keeps stereo and the full frequency range. Use AMR only when the content is voice and the goal is the smallest file.
AIFC (AIFF-C) Format at a Glance
| Property | Value |
|---|---|
| Full name | Audio Interchange File Format – Compressed |
| Creator | Apple Inc. |
| Released | AIFF 1988; AIFF-C July 1991 |
| Container payload | Uncompressed PCM, or a compressed codec named in the COMM chunk |
| Byte order | Big-endian |
| Typical PCM source | 44.1 kHz, 16-bit, stereo (about 10 MB per minute) |
| Channels | Mono or stereo |
| File extensions | .aifc, .aif, .aiff |
| Best for | Lossless masters and Mac/pro-audio interchange |
AMR Format at a Glance
| Property | Value |
|---|---|
| Full name | Adaptive Multi-Rate (AMR-NB) |
| Standardized by | 3GPP (adopted October 1999) |
| Sample rate | 8 kHz (narrowband) |
| Channels | Mono only |
| Speech bandwidth | ~200–3400 Hz (telephone quality) |
| Bitrate modes | 4.75, 5.15, 5.90, 6.70, 7.40, 7.95, 10.20, 12.20 kbps |
| File extension | .amr |
| Best for | Voice memos, dictation, telephony, MMS voice clips |
| Wideband variant | AMR-WB (G.722.2): 16 kHz, 50–7000 Hz, 6.60–23.85 kbps |
How to Convert AIFC to AMR
- Upload Your AIFC File: Drag and drop your .aifc (or .aif / .aiff) file onto the page, or click "+ Add Files" to browse.
- Confirm the AMR Settings: Open Advanced Options. Audio Channel defaults to Mono and Audio Sample Rate to 8000 Hz — the only valid combination for AMR-NB, so leave these as set.
- Pick a Constant Bitrate: Under Constant Bitrate, the Preset dropdown lists the AMR-NB modes from 4.75 kbps up to 12.20 kbps; 12.20 kbps gives the clearest speech, lower values shrink the file.
- Convert and Download: Click "Convert" and download your .amr file. No sign-up, no watermark.
Frequently Asked Questions
Why does my converted AMR file sound muffled or thin?
That is expected, not a bug. AMR-NB is a narrowband speech codec: it discards everything above roughly 3.4 kHz, drops to mono, and resamples to 8 kHz. Voices stay intelligible, but the high-frequency detail and stereo image of the original AIFC are gone. If you need fidelity, AMR is the wrong format — use AIFC to MP3.
Should I use AMR for music?
No. AMR-NB is engineered for telephone-grade speech, so music loses its highs, its stereo width, and most of its punch. Keep music as MP3, AAC, or the original AIFF/AIFC. Reach for AMR only when the recording is spoken word and you want the smallest possible file.
What bitrate should I pick for AMR-NB?
For most voice recordings, choose 12.20 kbps — the top AMR-NB mode — for the clearest speech. If you need a smaller file and the audio is just a single clear speaker, 7.40 kbps is a reasonable middle ground. The lowest modes (4.75–5.90 kbps) save space but make the voice noticeably rougher.
Does AMR support stereo or wideband audio?
AMR-NB is mono-only at 8 kHz. For wider, more natural-sounding speech there is AMR-WB (also standardized as ITU-T G.722.2), which runs at a 16 kHz sample rate and 50–7000 Hz bandwidth with bitrate modes up to 23.85 kbps. Both variants are still single-channel — neither carries true stereo.
Will the conversion keep my AIFC metadata or bit depth?
No. AMR-NB has no concept of the 16- or 24-bit PCM depth, stereo channels, or rich tags an AIFC can carry. The output is a fresh mono 8 kHz speech stream. If you need to preserve tags and quality, convert to a richer format instead.
What can open an AMR file after I download it?
AMR plays natively on most Android phones and in VLC, and many messaging and voice-recorder apps handle it. On desktop it is less universal than MP3, so if you plan to share widely, MP3 is the safer choice. To shorten a long recording first, run it through the audio cutter before converting.
Is the conversion private?
Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public.