Opus → AMR

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How to convert Opus to AMR

Step 1: Provide your Opus 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 AMR files.

Opus to AMR Conversion FAQ

How do I convert Opus audio to AMR without losing quality?

Upload the Opus file and the converter chooses the AMR codec / bitrate combination that matches the source profile. Lossless AMR (WAV / FLAC / ALAC) preserves every sample exactly; lossy AMR (MP3 / AAC / OGG / Opus) defaults to 192 kbps which is transparent for almost all music content.

What bitrate does the AMR file end up at?

Default 192 kbps for lossy AMR; pass-through for lossless AMR. 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 Opus to AMR actually reduce my audio quality?

If Opus is lossy (MP3, AAC) and AMR is lossless (WAV, FLAC), the AMR is no better than the Opus — you cannot recover information already discarded by the lossy Opus codec. If Opus is lossless and AMR is lossy, expect the AMR encoder to recompress; at 192 kbps the loss is imperceptible to most ears.

Does the Opus to AMR converter keep ID3 / metadata tags?

Yes — title, artist, album, year, track number, album art, BPM, replay-gain are read from the Opus container and written into the equivalent fields on the AMR container. ID3v2 (MP3), Vorbis comments (OGG, FLAC), MP4 atoms (AAC, M4A), RIFF INFO (WAV), iXML chunks all map cleanly.

Can I batch-convert hundreds of Opus files into AMR?

Yes — drop a folder of Opus 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 AMR keep the same sample rate as the Opus?

By default yes (a 48 kHz Opus produces 48 kHz AMR, a 44.1 kHz Opus produces 44.1 kHz AMR). For specific compatibility — e.g. downsampling 96 kHz studio masters to 44.1 kHz AMR for CD burning, or upsampling 22 kHz voicemail to 44.1 kHz AMR — the sample-rate dropdown applies high-quality SOX-style resampling.

Can I normalize loudness in the Opus to AMR step?

Yes — the loudness-normalize option applies ITU-R BS.1770 / EBU R128 normalization to the AMR 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 AMR playlist.

Will the AMR play on my car stereo / iPod / Sonos / Bluetooth speaker?

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 AMR codec for the platform you specify.

Is my Opus file private during conversion?

Yes — uploaded Opus files are processed in isolated workers and deleted within minutes. We never play, store, or share the audio content. The pipeline runs on hardware we control end-to-end; no third-party services receive your file.

How long does converting a 1-hour Opus to AMR take?

Same-codec re-mux (e.g. AAC inside M4A -> AAC inside MP4): 10-30 seconds. Codec change (e.g. FLAC -> MP3 or WAV -> AAC): typically 10-20% of source duration, so a 1-hour Opus -> AMR finishes in 6-12 minutes on the standard pipeline.

Why is the AMR file louder or quieter than the Opus source?

No automatic gain change happens unless the normalize option is turned on. If you do hear a level shift, your audio player or media library may be applying ReplayGain or per-track normalization on playback — turn that off and the AMR sounds bit-identical to the Opus (for lossless) or perceptually identical (for transparent lossy).

Can I convert Opus downloads from Bandcamp / SoundCloud into AMR?

If the Opus download is unprotected (no DRM), yes. DRM-encrypted streaming files (Spotify offline, Apple Music) are encrypted at the bit level and cannot be processed. Sources from Bandcamp purchases, SoundCloud go downloads, podcast feeds, and personal recordings all convert cleanly into AMR.

Opus

Opus is an open, royalty-free audio codec that provides high-quality compression for both speech and general audio. It is suitable for various applications, including voice over IP (VoIP) and streaming.

AMR

AMR (Adaptive Multi-Rate) is an audio compression format optimized for speech coding. It is commonly used in mobile phones for voice recordings and audio playback.