Step 1: Share your AMR files using the button above or by drag and drop.
Step 2: Click the 'Transform' button to start the transformation.
Step 3: Grab your converted Opus files.
AMR to Opus Transformation FAQ
How do I convert AMR audio to Opus without losing quality?
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Upload the AMR file and the converter chooses the Opus codec and bitrate to match the source. Lossless Opus (WAV / FLAC / ALAC) preserves every sample bit-identically; lossy Opus (MP3 / AAC / OGG / Opus) defaults to 192 kbps which is transparent for most ears. AMR is a narrowband speech codec running between 4.75 and 12.2 kbps, modelling the human vocal tract rather than the full audio spectrum. Opus scales from 6 kbps mono speech to 510 kbps stereo music in the same bitstream and switches modes automatically.
Is converting AMR to Opus a second round of lossy compression?
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Yes, and it is worth planning around. Both formats are lossy, so the Opus encoder is working from audio that has already been through one psychoacoustic pass, and its own decisions compound the first set. At 192 kbps or above the result is still transparent for most listening. If you have a lossless master anywhere, encoding the Opus from that instead avoids the double pass entirely.
Can I tag the Opus with artist and album information?
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Yes, and it is a genuine gain over AMR, which has nowhere dependable to store any of it. Opus carries title, artist, album, year, track number and embedded cover art in the container itself, so a music library files it correctly without a manual pass. Opus is the best-sounding lossy codec at low bitrates by a clear margin, and it powers WhatsApp voice notes, Discord and WebRTC.
Will the Opus play in my car or on older hardware?
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Often not. AMR is decoded by essentially everything, including car head units and elderly players; Opus needs software that knows the codec, which standalone hardware frequently does not have. If the destination is a car stereo or a portable player, that is a strong argument for staying on AMR. Opus is almost never supported by standalone hardware — assume software playback only, and expect car stereos to ignore it.
Why does music sound so poor in this conversion?
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Because one side of it is a speech codec rather than a music codec. It models the human vocal tract and discards everything outside telephone bandwidth, which is fine for a voice memo and destructive for anything with instruments in it. Converting away from it cannot restore the missing frequencies — they were never encoded in the first place. AMR destroys music: its 8 kHz bandwidth removes everything above telephone frequencies, and no amount of re-encoding brings it back.
What bitrate will the resulting Opus file use?
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Default is 192 kbps for lossy Opus; pass-through for lossless Opus. Override to 320 kbps for audiophile or 96 kbps for voice / podcast. The choice trades file size against audible fidelity; below 96 kbps lossy artifacts become noticeable on music.
Will going from AMR to Opus reduce my audio quality?
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If AMR is lossy and Opus is lossless (e.g. MP3 → WAV), the Opus is no better than the AMR — you cannot recover information already discarded. If AMR is lossless and Opus is lossy, the Opus codec recompresses; at 192 kbps the result is transparent for most content.
Does the AMR to Opus converter keep ID3 / metadata tags?
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Yes — title, artist, album, year, track number, and album art are read from the AMR container and written into the Opus container where the format supports tags. All common targets (MP3, AAC, FLAC, OGG) handle tags fine; raw WAV does not. Opus is an IETF standard from 2012 that merged Skype’s SILK speech codec with Xiph’s CELT music codec into one design.
Can I batch convert hundreds of AMR files to Opus?
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Yes — drop a folder of AMR files in and we process them in parallel. Premium has more parallel workers and no per-file size cap, so a 500-file batch finishes in minutes rather than tens of minutes.
Will the Opus keep the same sample rate as AMR?
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By default yes — 48 kHz AMR stays 48 kHz in Opus. If you need to downsample for compatibility (96 kHz → 44.1 kHz for CD burning), the sample-rate option applies high-quality resampling in the same encode pass.
Can I normalize loudness when converting AMR to Opus?
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Yes — the loudness-normalize option applies ITU-R BS.1770 / EBU R128 normalization to the Opus, targeting -14 LUFS (streaming standard) or -16 LUFS (podcast standard). Useful when batching tracks mastered at varying levels.
Will my Opus play on car stereo, iPod, and Sonos?
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MP3 plays everywhere. AAC plays on Apple, most Android, and Sonos. FLAC plays on Sonos and Android but not on older iPods. WAV plays on everything but is huge. The advanced device-preset dropdown picks an Opus codec optimized for your target hardware.
