AMR to AIFF Converter

Convert AMR to AIFF: What This Tutorial Covers

This walk-through is for anyone who needs to bring an AMR voice recording — a phone voice memo, a dictation, a recorded call, or an MMS audio clip — into a Mac or pro-audio tool that expects uncompressed AIFF/PCM input. It explains the one setting that matters, sets honest expectations about what the conversion can and cannot do, and covers the errors people actually hit.

How to Convert AMR to AIFF

1. Upload Your AMR File: Drag and drop your .amr file onto the page or click "Add Files." Old Android voice memos, dumbphone voicemail dumps, MMS audio attachments, and call recordings from apps like ACR or Cube Call Recorder all work. Batch upload is supported.
2. Set Audio Channel and Audio Sample Rate: Both default to "Original," which keeps the source layout — correct for almost every AMR file. AMR-NB is recorded at 8 kHz mono, so leaving these untouched is the honest choice (see the walk-through below before upsampling).
3. Trim if Needed: Use the Trim control to clip the output to just the section you want — handy for cutting an automated voicemail greeting from the start or isolating one statement from a long call.
4. Convert and Download: Click Convert and save your AIFF. The output is written as PCM 16-bit big-endian, the macOS-native AIFF default. No sign-up, no watermark.

Walk-through: Channel, Sample Rate, and the Codec

The xconvert AIFF encoder writes PCM 16-bit big-endian (PCM_S16BE) by default — the standard, macOS-native AIFF flavor that Logic Pro, GarageBand, Pro Tools, and Final Cut open without a decoder. You normally don't touch the codec; the two settings worth understanding are channel and sample rate.

• Keep Audio Channel on "Original" (mono). AMR is always single-channel. Forcing stereo just duplicates the one channel into both ears — it doubles the file size and adds nothing. Mono AIFF plays correctly on stereo systems automatically. Only switch to stereo if you plan to mix this voice into a stereo session and want a stereo bed to work in.
• Keep Audio Sample Rate on "Original" (8 kHz for AMR-NB). This is the honest setting. AMR-NB captured audio at 8 kHz, so its real content tops out around 3.4 kHz. Upsampling to 44.1 kHz or 48 kHz makes the file larger and matches a session rate, but it invents no new detail — interpolation can't recover frequencies the source never recorded.
• When upsampling is still the right call: set Audio Sample Rate to 44.1 kHz or 48 kHz if your DAW session runs at that rate and you'd rather not let the host resample on import. The audio won't sound better, but it lines up with the project so the engine doesn't resample mid-session.

Common Errors and How to Fix Them

• "The AIFF still sounds like a phone call" — That's expected, not a conversion fault. AMR-NB is an 8 kHz narrowband speech codec; it discarded everything above ~3.4 kHz at record time. AIFF stores that telephone-band audio losslessly, but it cannot add back what was never captured.
• "My AIFF is huge compared to the AMR" — Also expected. AMR stores a few vocal-tract parameters per frame at single-digit kbit/s; AIFF stores every PCM sample uncompressed. A tiny speech file balloons by one to two orders of magnitude. You get a big file, not better sound.
• "My DAW won't open the original AMR but opens the AIFF fine" — Most desktop editors ship without an AMR decoder for licensing reasons, which is exactly why this conversion exists. The AIFF is raw PCM that every Mac audio app reads natively.
• "My uploaded file is .awb, not .amr" — That's AMR-WB (wideband, 16 kHz). The decoder reads it too; leave the sample rate on "Original" to keep the 16 kHz source rate.
• "Output is silent or truncated" — The source AMR is likely corrupted or only partially transferred off the phone. Re-export it from the original device and re-upload.

When This Doesn't Work

If the recording is DRM-protected (some carrier voicemail exports are), or the AMR file is corrupted mid-transfer, decoding will fail or produce silence — re-export a clean copy from the source device. If you only want a small, universally-playable copy of the clip rather than an uncompressed editing master, convert to a compressed format instead: see AMR to MP3 for a tiny file that plays on any car stereo, phone, or messaging app. To shrink an AIFF after editing, use the Audio Compressor. For the reverse direction, see AIFF to AMR.

Frequently Asked Questions

Will converting AMR to AIFF make my voice recording sound better?

No. AMR-NB is a lossy 8 kHz narrowband speech codec — once audio is encoded as AMR, everything above roughly 3.4 kHz is gone and the waveform is a parametric reconstruction, not a faithful sample stream. Decoding it into uncompressed AIFF PCM gives you a much larger, edit-friendly file, but it cannot rebuild detail AMR discarded. You get a big file, not a better-sounding one. The real benefit is editability and avoiding further loss when you process the audio.

Should I upsample the AIFF to 44.1 kHz, or leave it at 8 kHz?

For pure listening or archival, leave Audio Sample Rate on "Original" — an AMR-NB source has no content above what 8 kHz can hold, and upsampling only inflates the file. Upsample to 44.1 kHz or 48 kHz only when your DAW session runs at that rate and you want to avoid an import-time resample. It aligns the file with the project; it does not add fidelity.

Why is my AIFF so much larger than the AMR?

Because AIFF stores raw uncompressed PCM while AMR stores a handful of speech-coding parameters per frame at single-digit kbit/s. A minute of AMR-NB voice is on the order of tens of kilobytes; the same minute as 8 kHz mono 16-bit PCM AIFF is roughly 1 MB — about 15 to 20 times larger at the native rate, and far more if you upsample to 44.1 kHz. That size jump is the cost of an uncompressed format, not added quality.

What codec and byte order does the output AIFF use?

The output is PCM signed 16-bit big-endian (PCM_S16BE), the standard macOS-native AIFF layout. Big-endian is AIFF's defining trait — WAV is the little-endian (RIFF) equivalent of the same uncompressed PCM. If you specifically need little-endian WAV instead, that's a different container; AIFF is the right pick for Logic Pro and GarageBand workflows.

Should I keep the recording mono or convert it to stereo?

Keep it mono. AMR is always single-channel, so "stereo" just clones the one channel into both — double the size, zero benefit. Mono AIFF plays correctly on stereo speakers and headphones on its own. Choose stereo only if you intend to layer additional audio around the voice in a stereo session.

How are my files handled, and how long do you keep them?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. In our testing, a typical 60-second AMR-NB voice memo decodes to a mono 8 kHz AIFF of roughly 1 MB; the real limit on the way in is upload size and time, not your device.