How to convert AMR to AAC
- 1
Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
- 2
Convert AMR to AAC
NexMedia converts AMR to AAC on its own servers. Processing time depends on the file size and how busy the queue is.
- 3
Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About AMR
AMR (Adaptive Multi-Rate) is a speech codec designed for mobile networks; its narrow-band form codes voice at 4.75 to 12.2 kbit/s.
Voice notes and call recordings from older phones and dictation apps.
AMR keeps only the frequency range of speech, so music in an AMR file sounds poor, and converting it cannot bring the missing range back.
Convert AMR to AAC online free, no account required — AAC is the lossy audio codec that succeeded MP3.
Change AMR to AAC without losing quality — convert AMR to AAC free in your browser.
Why do my recorded calls sound so tinny and robotic? AMR was designed to squeeze narrow-band speech over 2G networks, so it discards almost everything but the voice — no conversion can restore the missing range.
About AAC
AAC (Advanced Audio Coding) is the lossy audio codec standardised in MPEG-2 and MPEG-4 as the successor to MP3; at the same bitrate it generally sounds better than MP3.
It is the audio in most MP4 videos, in Apple Music and on YouTube; a .aac file is a bare AAC stream without a container.
A bare .aac stream has only limited room for tags and cover art, so music players usually expect AAC inside an M4A file.
Why convert music to AAC instead of MP3? At the same bitrate AAC sounds better, and every modern phone, computer and streaming service decodes it.
What changes when you convert AMR to AAC
- The audio is decoded and re-encoded as AAC at the default settings, so the result is close to the AMR but not bit-identical.
- AMR and AAC are both lossy formats, so this conversion adds a second round of lossy compression; keep the original AMR if you may need the best quality later.
Settings you can change
Before you convert AMR to AAC, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted AAC file is kept for 2 hours, then deleted.
AMR to AAC: questions and answers
Does converting AMR to AAC reduce quality?
The audio is decoded and re-encoded as AAC at the default settings, so the result is close to the AMR but not bit-identical. AMR and AAC are both lossy formats, so this conversion adds a second round of lossy compression; keep the original AMR if you may need the best quality later.
What is the difference between AMR and AAC?
AMR is a narrow-band speech codec from mobile phones. AAC is the lossy audio codec that succeeded MP3.
Can I change the settings when converting AMR to AAC?
Before you convert AMR to AAC, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Do I need an account to convert AMR to AAC?
No. You can convert AMR to AAC without an account; signing in raises the file-size and daily limits.
How long is my converted AAC file kept?
The AAC file you convert from AMR is kept for 2 hours, then deleted automatically.
My AMR is already lossy — does the AAC lose even more?
AMR and AAC are both lossy formats, so this conversion adds a second round of lossy compression; keep the original AMR if you may need the best quality later.
When I convert AMR to AAC, is the audio re-encoded?
The audio is decoded and re-encoded as AAC at the default settings, so the result is close to the AMR but not bit-identical.