AMR to AAC Converter
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Supports: AMR
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.amr files come from old phone voice recorders, voicemail exports, and telephony systems — and they barely play on modern phones, browsers, or editors. Converting to AAC fixes that: AAC is the audio format iPhones, Android, desktops, and browsers all play natively, so your old voice memos and voicemails finally open everywhere. It will not make the recording sound better — an AMR file was captured by an 8 kHz telephone codec, and AAC cannot add back frequencies that were never recorded — but it makes that recording usable again.
How to Convert AMR to AAC
- Upload Your AMR File: Drag and drop, or click "+ Add Files" to select one or more
.amrfiles. Batch uploads are supported. - Pick a Quality Preset: Under Advanced Options, leave Quality Preset on a recommended setting, or switch to Custom Bitrate and choose a modest rate — speech does not need a high bitrate, so there is no point inflating the file.
- Keep It Mono (Optional): AMR is mono by design, so leave Audio Channel on its original value rather than upmixing to stereo; use Trim if you only need part of the recording.
- Convert and Download: Click "Convert" and download your
.aacfile. No sign-up, no watermark.
AMR vs AAC — What Changes in This Conversion
| Property | AMR (AMR-NB) | AAC |
|---|---|---|
| Full name | Adaptive Multi-Rate | Advanced Audio Coding |
| Standardized | 3GPP, October 1999 | MPEG-2 Part 7 (1997), MPEG-4 (1999) |
| Designed for | Telephone-network speech | Music and general audio |
| Coding | ACELP speech model | MPEG transform (MDCT) |
| Sample rate | 8 kHz (fixed) | 8–96 kHz |
| Frequency response | 200–3,400 Hz | Up to ~20 kHz |
| Channels | Mono only | Up to 48 (mono, stereo, 5.1) |
| Plays on modern phones/browsers | Rarely without an extra app | Yes, broadly |
| File extension | .amr, .3ga |
.aac, .m4a |
Converting AMR to AAC is a compatibility upgrade, not a fidelity one: the output plays everywhere, but it carries only the narrow speech band the original AMR file captured.
Frequently Asked Questions
Will converting AMR to AAC make my recording sound better?
No. The recording was captured by AMR-NB, an 8 kHz telephone-quality codec that only keeps the 200–3,400 Hz speech band. AAC cannot restore detail that was never recorded, so the audio will not gain clarity, brightness, or bandwidth. What you get is compatibility: an .aac file plays on iPhone, Android, desktops, and browsers that will not open .amr at all.
Why won't my AMR file play on my iPhone or in my browser?
AMR was built for 2G/3G telephony and voice messaging, and modern iOS, Android, and web browsers do not treat it as a standard playback format — you usually need a separate app. AAC is the format Apple uses for most iPhone and iPad music, and browser support for AAC sits around 96% globally (Chrome, Edge, and Safari fully; Firefox via the operating system's codecs), so converting to AAC is the reliable way to make an old voice memo or voicemail openable everywhere.
What bitrate should I choose for AAC speech?
A modest one. AMR-NB tops out at 12.2 kbps, so the source has very little high-frequency content to preserve; a low-to-moderate AAC bitrate captures everything the original held without bloating the file. Pushing a high bitrate or up to AAC's hi-fi range (around 128 kbps and above, which is meant for music) just makes a bigger file with no audible gain on telephone-band speech.
Should the AAC output be mono or stereo?
Keep it mono. AMR is a single-channel speech format, so there is no second channel to recover — forcing stereo only duplicates the same audio into two channels and doubles the data for nothing. Leaving Audio Channel on the source value keeps the file small and faithful to the original recording.
Should I convert AMR to AAC, MP3, or WAV instead?
It depends on where the file is going. Choose AAC for the broadest native playback on phones and in browsers. Choose AMR to MP3 when a player or platform specifically wants MP3, which is the most universally accepted lossy format. Choose AMR to WAV when you are feeding the audio into an editor or a transcription tool that prefers an uncompressed input. If you ever need to go back the other way for a legacy telephony system, see AAC to AMR.
How do you handle my files, and how long are they kept?
In our testing, a minute of AMR voice converted cleanly to a small AAC file with the speech fully intelligible and no audible change from the original. Your file is uploaded over an encrypted connection, converted on our servers, and the upload and result are deleted automatically a few hours after conversion. There is no sign-up, no watermark, and files are never shared or made public.