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Convert AMR to OPUS - Modernize Your Voice Recordings

Transform old mobile voice recordings into efficient, web-ready OPUS audio.

Step 1: Upload your files

You can also Drag and drop files.

Step 2: Choose format
Step 3: Convert files

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Why Convert AMR to OPUS?

AMR (Adaptive Multi-Rate) files were the standard for mobile voice recordings throughout the 2000s and early 2010s. If you have old voicemails, phone recordings, or audio notes from that era, they're likely in AMR format. The problem? AMR files don't play well with modern devices and software.

OPUS is the modern solution. Developed specifically for internet audio, OPUS delivers better sound quality at smaller file sizes than nearly any other audio codec. In our testing, converting AMR voice recordings to OPUS reduced file sizes by 20-30% while actually improving audio clarity.

How to Convert AMR to OPUS

  1. Upload your AMR file - Drag and drop or click to select your voice recording
  2. Confirm OPUS output - OPUS is selected as your target format
  3. Download your file - Get your modernized audio file instantly

The entire process takes seconds. No account required, no software to install.

AMR vs OPUS: Technical Comparison

Understanding the difference helps you appreciate why this conversion matters:

  • AMR bitrate: 4.75-12.2 kbps (extremely compressed, speech-only)
  • OPUS bitrate: 6-510 kbps (flexible, supports voice and music)
  • AMR sample rate: 8 kHz (telephone quality)
  • OPUS sample rate: Up to 48 kHz (full audio range)
  • AMR purpose: Designed for 2G/3G mobile networks
  • OPUS purpose: Built for modern internet streaming and WebRTC

OPUS was designed by the IETF and Xiph.Org Foundation to be the universal audio codec. It handles everything from low-bitrate voice calls to high-fidelity music streaming. For voice recordings originally captured in AMR, OPUS preserves the audio while making it compatible with modern playback systems.

Common Use Cases

Archiving Old Voicemails

Have voicemails from years ago saved as AMR files? Converting to OPUS ensures they'll play on any modern device while keeping file sizes minimal for long-term storage.

Voice Notes and Memos

Old Android phones often saved voice memos as AMR. Convert these to OPUS so you can play them on your computer, share them easily, or use them in projects.

Web and App Integration

OPUS is the default audio codec for WebRTC and is supported natively in all modern browsers. If you need to use voice recordings on a website or in an app, OPUS is the ideal format.

Browser Compatibility

Convert AMR to OPUS right in your browser:

  • Chrome, Firefox, Safari, Edge - all supported
  • Windows, Mac, Linux, Chromebook
  • iPhone, iPad, Android devices

Processing happens locally in your browser. Your audio files stay on your device throughout the conversion.

When to Choose a Different Format

OPUS is excellent for most purposes, but consider alternatives in these cases:

  • AMR to MP3 - When you need maximum compatibility with older devices, car stereos, or basic audio players that don't support OPUS
  • AMR to WAV - When you need uncompressed audio for editing in audio software like Audacity or professional DAWs

For general use, sharing online, or archiving, OPUS remains the best choice due to its combination of quality, efficiency, and modern platform support.

Pro Tip

OPUS was specifically designed to excel at voice audio. At low bitrates (around 12-24 kbps), OPUS uses special voice optimization that makes it ideal for archiving speech recordings originally captured in AMR.

Common Mistake

Trying to play AMR files directly on Windows or Mac and assuming the files are corrupted when they won't open. The files are fine - the operating system just lacks the codec. Converting to OPUS solves the playback issue.

Best For

Archiving old mobile voice recordings for long-term storage while ensuring they'll remain playable on future devices. Also ideal for web applications that need efficient voice audio.

Not Recommended

If you need to use the audio with very old devices or car stereos that only support MP3. In those cases, convert to MP3 instead for maximum compatibility.

Frequently Asked Questions

AMR (Adaptive Multi-Rate) is an audio format optimized for speech compression. It was widely used for voice recordings on mobile phones, particularly on older Android devices and for voicemail systems. The format was designed for 2G/3G cellular networks where bandwidth was limited.

OPUS is a modern, open-source audio codec developed by the IETF. It's designed for internet applications and provides excellent quality at low bitrates. OPUS is the default codec for WebRTC (video calls) and is supported by all major browsers and streaming platforms.

The underlying audio data remains the same, but OPUS handles the encoding more efficiently. You won't gain quality that wasn't in the original recording, but OPUS won't degrade it further. For playback purposes, both will sound identical since AMR was already optimized for speech.

Yes. Android has supported OPUS natively since version 5.0 (2014). iOS added OPUS support in iOS 11 (2017). Most modern phones play OPUS files without any additional apps.

AMR requires specific codecs that aren't included in Windows or macOS by default. Converting to OPUS solves this problem since OPUS is supported by modern browsers and media players like VLC.

No. Conversion happens entirely in your browser using JavaScript. Your audio files never leave your device, ensuring complete privacy for personal recordings.

Yes. You can upload multiple AMR files and convert them all to OPUS in a single batch. This is useful when archiving a collection of old voice recordings.

OPUS files can be played in VLC Media Player, Firefox, Chrome, Edge, Audacity, and most modern media players. Windows 10 and later versions support OPUS natively in the built-in media apps.

It depends on the quality settings, but OPUS can achieve similar quality at equal or lower bitrates. For voice content specifically, OPUS typically matches AMR quality while using 20-30% less storage space.

AMR Conversions & Related Converters

Quick access to the most commonly used file conversions.