Convert Opus to AAC
Convert Opus audio files to AAC directly in your browser. Apple's iOS Music app, iPhone built-in player, and AirDrop reject Opus — AAC is the native iOS codec. Particularly useful for WhatsApp voice notes saved on Android that need to play in CarPlay. No upload needed.
Drag 'n' drop files here, or
click to select files
.opus
Drop your files and click Convert to get AAC
//when_to_use
When to Convert Opus to AAC
- Converting WhatsApp voice notes (Opus) to AAC for AirDrop sharing to iPhone friends without third-party app dependency
- Encoding Discord-recorded Opus dialogue as AAC for import into iOS Voice Memos / Music libraries
- Preparing Opus podcast clips as AAC for Apple Podcasts submissions (which prefers AAC)
- Converting YouTube-DL Opus extracts to AAC for sync to AirPods Max via Apple Music local library
- Migrating Telegram saved Opus messages to AAC for playback in CarPlay (which requires Apple Music or VLC, both AAC-friendly)
//comparison
OPUS vs AAC
| Property | OPUS | AAC |
|---|---|---|
| Codec | Opus (CELT+SILK) | AAC LC |
| Typical size (3 min) | 1-3 MB | 4-5 MB |
| iOS native support | No (third-party only) | Yes (hardware decode) |
| AirDrop preview | Fails | Works |
| Patent / royalty | Patent-free | Licensed (Fraunhofer) |
| Best for | WhatsApp, Discord, web | iPhone, AirPods, CarPlay |
//how_it_works
How It Works
Drop your Opus files
Drag and drop or pick .opus files. First conversion loads FFmpeg WASM (~30MB).
FFmpeg decodes Opus
FFmpeg WASM extracts Opus packets from the OGG container and decodes to 16-bit PCM at 48 kHz.
AAC encode (192 kbps)
PCM is re-encoded with FFmpeg's native AAC encoder at 192 kbps CBR, then ADTS-framed for standalone .aac output.
Download AAC files
AACs play in iOS Music, Voice Memos, AirDrop preview, AirPods, CarPlay, every Bluetooth device, and VLC/Foobar2000.
// under the hood
Opus is a Xiph.Org / Mozilla low-latency codec at 48 kHz internal. AAC (Advanced Audio Coding) is the MPEG-4 lossy standard, hardware-decoded across the entire Apple ecosystem. Our converter uses FFmpeg WASM to decode the OGG/Opus stream to 16-bit PCM at 48 kHz, then re-encode with FFmpeg's native AAC encoder at 192 kbps CBR, output as ADTS-framed .aac.
//faq
Frequently Asked Questions
- Will quality drop converting Opus to AAC?
- Yes — both are lossy. Opus is technically the better codec at low bitrates, but at 192 kbps AAC the loss is generally inaudible on phones, AirPods, and car speakers. The transcoding step adds minor compounded artifacts.
- Why does iOS reject Opus?
- Apple has no native Opus support in the system Music app, Files preview, Voice Memos, or AirDrop. Third-party apps (VLC, Outplayer) handle Opus, but not the built-in player or CarPlay. This conversion exists because most users want voice notes / Discord clips to play in CarPlay or AirDrop to friends' iPhones.
- What AAC bitrate do you use?
- FFmpeg's native AAC encoder at 192 kbps CBR — the iTunes Plus and Apple Music profile. Sample rate is preserved from Opus's 48 kHz. Output is ADTS-framed raw .aac (universally compatible).
- Will the AAC play in CarPlay if I name it .aac?
- CarPlay specifically plays from the Apple Music library or supported third-party apps. To get the AAC into CarPlay you typically import it into the Music app (or VLC/Outplayer) on the iPhone. The AAC is the right codec; getting it into CarPlay is an iOS sync step.
- Are my files uploaded?
- No. FFmpeg WebAssembly decodes Opus and re-encodes AAC entirely inside your browser. Files never leave your device.
//related_converters
Related Converters
Similar conversions you might need.
Convert Opus to MP3
Convert Opus audio to MP3 for legacy device compatibility — car stereos, old MP3 players, and DJ software.
→Convert Opus to WAV
Convert Opus voice notes and audio to uncompressed WAV for transcription, editing, and forensic workflows.
→Convert Opus to OGG
Convert Opus audio to OGG Vorbis for game engines and players that don't speak Opus.
→Convert Opus to FLAC
Convert Opus audio to FLAC to stop further generational loss in re-edits and archival.
→Convert MP3 to AAC
Convert MP3 audio files to AAC format for Apple and streaming services.
→Convert WAV to AAC
Convert uncompressed WAV audio to AAC format for Apple devices and streaming.
→