Opus → AAC

Process Your Opus to AAC documents simply

Designate your files

or drag and drop your files here

Free plan: 1 Conversions/hour · Go Unlimited →

Process up to 1 GB files free, Pro users can convert up to 100 GB files; Sign up now

Uploading

How to process Opus to AAC

Step 1: Deliver your Opus files using the button above or by place and set.

Step 2: Click the 'Process' button to start the processing.

Step 3: Obtain your converted AAC files.

Opus to AAC Processing FAQ

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

Upload the Opus file and the converter picks a AAC codec / bitrate combination matched to the source. Lossless target (AAC = WAV / FLAC / ALAC) preserves every sample; lossy target (AAC = MP3 / AAC / OGG / Opus) defaults to 192 kbps which is transparent for most ears.

What bitrate does the AAC file use?

Default 192 kbps for lossy AAC; pass-through for lossless AAC. Override to 320 kbps for audiophile, 256 kbps for high-quality music, or 96 kbps for voice / podcast. The choice trades file size against audible fidelity at very low bitrates.

Will going from Opus to AAC reduce my audio quality?

If Opus is lossy and AAC is lossless (e.g. MP3 → WAV), the AAC file is no better than the Opus source — you cannot recover information that was thrown away by the original lossy encode. If Opus is lossless and AAC is lossy, expect the AAC codec to recompress; at 192 kbps this is transparent for nearly all material.

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

Yes — title, artist, album, year, track number, embedded album art are read from the Opus container and written into the AAC container (every common audio format supports tags). Tags survive even when the underlying codec changes.

Can I batch convert hundreds of Opus files to AAC?

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 typically finishes in minutes rather than tens of minutes. Tags and folder structure are preserved.

Will the AAC keep the same sample rate as Opus?

By default yes — 48 kHz Opus → 48 kHz AAC, 96 kHz → 96 kHz. If you need to downsample for compatibility (96 kHz studio masters → 44.1 kHz for CD burning), the advanced sample-rate option uses a high-quality resampler (libsoxr or sox-equivalent) with no audible aliasing.

Can I normalize loudness in the Opus to AAC step?

Yes — the loudness-normalize option applies ITU-R BS.1770 / EBU R128 normalization to the AAC output, targeting -14 LUFS (streaming standard) or -16 LUFS (podcast standard). Useful when batch-converting a mixed library whose tracks have wildly varying mastering levels.

Will the AAC play on my car stereo, iPod, or Sonos?

MP3 plays universally on every device built in the last 20 years. AAC plays on Apple, most Android, and Sonos. FLAC plays on Sonos, Android, and most modern car head units; less well on older iPods. WAV plays on everything but is huge. The device-preset option picks the safest AAC codec for the target.

Is my Opus file private during conversion?

Yes — uploaded Opus files are processed in isolated workers and deleted within minutes of completion. We never play, store, fingerprint, or share the audio content. The full data-retention window is documented at /privacy/.

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

Same-codec re-mux (e.g. FLAC stream inside one container moved to another): 10-30 seconds. Re-encode to a different codec: typically 10-20% of source duration, so a 1-hour Opus → AAC finishes in 6-12 minutes.

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

No automatic gain change happens unless you explicitly enable the normalize option. If you see a level difference at playback time, your audio player or media library may be applying ReplayGain or per-track normalization on its own — that is the player, not our pipeline.

Can I convert Opus streaming downloads to AAC?

If the Opus download is unprotected (no DRM), yes. DRM-encrypted streaming files (Spotify offline, Apple Music) are encrypted at the byte level and we cannot decrypt or process them. Sources from Bandcamp, SoundCloud, archive.org, and personal recordings convert without issue.

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.