Step 1: Provide your AMR files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted Opus files.
AMR to Opus Conversion 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 / bitrate combination that matches the source profile. Lossless Opus (WAV / FLAC / ALAC) preserves every sample exactly; lossy Opus (MP3 / AAC / OGG / Opus) defaults to 192 kbps which is transparent for almost all music content. 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 does the Opus file end up at?
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Default 192 kbps for lossy Opus; pass-through for lossless Opus. Override to 320 kbps if you want maximum lossy fidelity, 128 kbps for size-constrained podcast distribution, or 96 kbps for voice-only sources where the smaller file matters more than studio detail.
Will going from AMR to Opus actually reduce my audio quality?
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If AMR is lossy (MP3, AAC) and Opus is lossless (WAV, FLAC), the Opus is no better than the AMR — you cannot recover information already discarded by the lossy AMR codec. If AMR is lossless and Opus is lossy, expect the Opus encoder to recompress; at 192 kbps the loss is imperceptible to most ears.
Does the AMR to Opus converter keep ID3 / metadata tags?
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Yes — title, artist, album, year, track number, album art, BPM, replay-gain are read from the AMR container and written into the equivalent fields on the Opus container. ID3v2 (MP3), Vorbis comments (OGG, FLAC), MP4 atoms (AAC, M4A), RIFF INFO (WAV), iXML chunks all map cleanly. 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 into 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. Folder structure is preserved in the output ZIP.
Will the Opus keep the same sample rate as the AMR?
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By default yes (a 48 kHz AMR produces 48 kHz Opus, a 44.1 kHz AMR produces 44.1 kHz Opus). For specific compatibility — e.g. downsampling 96 kHz studio masters to 44.1 kHz Opus for CD burning, or upsampling 22 kHz voicemail to 44.1 kHz Opus — the sample-rate dropdown applies high-quality SOX-style resampling.
Can I normalize loudness in the AMR to Opus step?
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Yes — the loudness-normalize option applies ITU-R BS.1770 / EBU R128 normalization to the Opus output, targeting -14 LUFS (streaming standard) or -16 LUFS (podcast standard) or a custom value. Useful when batch-converting tracks with varying mastering levels into a single Opus playlist.
Will the Opus play on my car stereo / iPod / Sonos / Bluetooth speaker?
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MP3 plays universally on every device made in the last 20 years. AAC plays on Apple, most Android, Sonos, and modern car stereos. FLAC plays on Sonos and recent Android, less well on older iPods. WAV plays on everything but the file is huge. The device-target dropdown picks a safe Opus codec for the platform you specify.
