How to convert AMR to Opus
- 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 Opus
NexMedia converts AMR to Opus 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 Opus online free, no account required — Opus is a modern open lossy codec for speech and music.
Change AMR to Opus without losing quality — convert AMR to Opus 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 Opus
Opus is an open, royalty-free lossy audio codec standardised by the IETF in 2012 (RFC 6716). It handles both speech and music well, from very low to high bitrates.
Voice and video calls, WhatsApp voice messages, WebRTC, and the audio track of WebM videos.
Opus always decodes at 48 kHz, and some older players and devices do not support it.
Why convert voice recordings to Opus? It stays clear at very low bitrates, so calls and dictation shrink dramatically without becoming hard to understand.
What changes when you convert AMR to Opus
- The audio is decoded and re-encoded as Opus at the default settings, so the result is close to the AMR but not bit-identical.
- AMR and Opus 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 Opus, 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 Opus file is kept for 2 hours, then deleted.
AMR to Opus: questions and answers
Does converting AMR to Opus reduce quality?
The audio is decoded and re-encoded as Opus at the default settings, so the result is close to the AMR but not bit-identical. AMR and Opus 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 Opus?
AMR is a narrow-band speech codec from mobile phones. Opus is a modern open lossy codec for speech and music.
Can I change the settings when converting AMR to Opus?
Before you convert AMR to Opus, 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 Opus?
No. You can convert AMR to Opus without an account; signing in raises the file-size and daily limits.
How long is my converted Opus file kept?
The Opus file you convert from AMR is kept for 2 hours, then deleted automatically.
My AMR is already lossy — does the Opus lose even more?
AMR and Opus 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 Opus, is the audio re-encoded?
The audio is decoded and re-encoded as Opus at the default settings, so the result is close to the AMR but not bit-identical.