Step 1: Supply your AMR files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted Opus files.
AMR to Opus Conversion FAQ
Is the AMR to OPUS conversion reversible?
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You can convert the OPUS back to AMR on this site. If either format involved is lossy, the round-trip is not bit-perfect even though it is visually or audibly close.
What output quality should I expect from AMR to OPUS?
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Default settings target broadcast / web quality — visually identical to the source for most viewers. For archival use, pick the highest quality option in the converter settings.
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. 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.
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.
What exactly is an OPUS file?
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A container with the audio inside it, rather than the audio on its own. That extra layer is where the length, the seek index and whatever metadata the format defines are kept, so a player knows how long an OPUS is before decoding a single frame instead of scanning the whole file to find out. It also means the extension does not always settle what is inside: several containers of this kind are allowed to hold more than one sort of audio, which is why two OPUS files can behave differently while looking identical from outside.
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.
Is there a licence attached to AMR?
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Not one you have to think about. The codec is covered by patent pools, and the licensing is settled by whoever ships the decoder — the phone, the browser, the operating system — long before a file reaches you. It is why the format is everywhere in hardware, and why royalty-free alternatives were built at all. It changes nothing about converting a file you already have, and it is only a live question if you are shipping an encoder yourself.
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.
Is there a file-size limit when converting AMR to OPUS?
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Free conversions have a size limit per file, set by the type of file, and the page tells you when a file is over it. A paid plan removes that limit, so much larger files can be converted.
Can I batch-convert several AMR files to OPUS at once?
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Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
What happens to my AMR files after the conversion?
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Uploaded files are processed on our own conversion servers, nobody looks at them, and they are not shared. The upload and the converted file are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
What apps can play a OPUS file?
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OPUS plays in most music players, browsers, and media libraries. iTunes / Apple Music, VLC, Foobar2000, and phone media apps handle it natively.
