AMR to OPUS Converter

Convert AMR to Opus Online

This converter takes an .amr voice recording — the kind an old Android phone, a feature-phone voicemail, or a basic voice-memo app saved — and re-encodes it as a modern .opus file. AMR is a dead-end speech format from 1999 that most current players and editors won't open cleanly; Opus is the open, royalty-free codec that browsers, Android, and messaging apps run on today. So this is the forward-looking way to move an old recording out of an obsolete container and into a tiny, playable archive — a compatibility and archival move, not a way to make telephone audio sound better.

How to Convert AMR to Opus

1. Upload Your AMR File: Drag and drop your .amr file onto the page, or click "+ Add Files" to browse. Old voice recorder memos, dumbphone voicemails, and recorded calls all work, and you can queue several at once to convert with the same settings.
2. Pick a Quality Preset: Open Advanced Options and choose a Quality Preset (Lowest through Highest), or set a Custom Bitrate, Constant Bitrate, or Variable Bitrate directly. Opus is very efficient with speech, so a modest setting keeps the file tiny — see the FAQ on why a high bitrate won't add detail.
3. Set Audio Channel, Sample Rate, or Trim: Leave Audio Channel and Audio Sample Rate on "Original" to copy the source, or downmix to Mono and resample for an even smaller file. Use Trim to keep only the part you need.
4. Convert and Download: Click "Convert" and download the .opus file. No sign-up, no watermark.

AMR vs Opus at a Glance

Frequently Asked Questions

Why convert an AMR recording to Opus instead of leaving it as-is?

AMR is awkward to use today: most modern players, editors, and phones won't open a bare .amr cleanly, and the format is patent-encumbered. Opus is the opposite — an open, royalty-free codec that current browsers, Android 10 and up, and apps like WhatsApp, Discord, and Zoom play natively. Converting a voice memo or recorded call to a standalone .opus file rescues it from a 1999 speech format into a small, modern archive you can actually play, back up, and send. If your target is an older device that predates Opus, use the AMR to MP3 converter instead for the widest compatibility.

Will converting to Opus improve how my AMR recording sounds?

No, and it's worth being clear about why. AMR-NB — the variant nearly every voice recorder and feature phone used — is a 3GPP speech codec adopted in October 1999 that samples at just 8 kHz and keeps only the 200 Hz–3,400 Hz telephone voice band. Opus cannot restore the highs and lows the phone never captured; no bitrate setting invents detail that was never recorded. There is a genuine silver lining, though: Opus's speech engine, SILK, descends from the same speech-coding lineage as AMR, so it re-encodes voice extremely efficiently. You get a tiny, faithful copy of that telephone-grade speech — just don't expect it to sound like a fresh recording.

What bitrate or quality preset should I choose for voice?

Less than you might expect, because Opus is efficient and AMR speech carries little detail to begin with. For voice from a feature phone, a Medium preset — roughly 24–48 kbps mono — is clean and tiny, and that low-bitrate speech range is exactly what Opus was tuned for. Pushing a speech clip up to 128 kbps or higher just makes a bigger file; it does not add fidelity the recording never had. Leaving Audio Channel and Sample Rate on "Original" is safe, since the AMR-NB source is already mono at 8 kHz.

Which apps and devices can play the .opus file?

On modern targets, support is broad: Chrome, Firefox, and Edge all play Opus in the browser, Android recognizes the bare .opus extension from Android 10 onward, and current iPhones play it through Safari (full support landed in iOS 18.4). Desktop Safari on macOS is more limited and may not play a raw .opus reliably, and a long tail of older car stereos and basic media players never added Opus at all. For one of those, convert the same recording with the AMR to MP3 converter for near-universal playback. Going the other direction — back to a .amr file for legacy mobile software — is handled by the Opus to AMR converter.

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 60-second AMR-NB voice memo converted to a roughly 130–180 KB Opus file at a Medium preset; speech recordings stay small because there is little high-frequency detail to encode. If a transcription or speech-to-text tool needs uncompressed input instead, the AMR to WAV converter is the better choice.