How to convert Opus to AAC
- 1
Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
- 2
Convert Opus to AAC
NexMedia converts Opus to AAC on its own servers. Processing time depends on the file size and how busy the queue is.
- 3
Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About Opus
Opus is an open, royalty-free lossy audio codec standardised by the IETF in 2012 (RFC 6716). It handles both speech and music well, from very low to high bitrates.
Voice and video calls, WhatsApp voice messages, WebRTC, and the audio track of WebM videos.
Opus always decodes at 48 kHz, and some older players and devices do not support it.
Convert Opus to AAC online free, no account required — AAC is the lossy audio codec that succeeded MP3.
Change Opus to AAC without losing quality — convert Opus to AAC free in your browser.
Why won't my car stereo or older phone play Opus files? The codec only became widespread in the last decade, and hardware that predates it usually decodes just MP3 — converting keeps the music compatible.
About AAC
AAC (Advanced Audio Coding) is the lossy audio codec standardised in MPEG-2 and MPEG-4 as the successor to MP3; at the same bitrate it generally sounds better than MP3.
It is the audio in most MP4 videos, in Apple Music and on YouTube; a .aac file is a bare AAC stream without a container.
A bare .aac stream has only limited room for tags and cover art, so music players usually expect AAC inside an M4A file.
Why convert music to AAC instead of MP3? At the same bitrate AAC sounds better, and every modern phone, computer and streaming service decodes it.
What changes when you convert Opus to AAC
- The audio is decoded and re-encoded as AAC at the default settings, so the result is close to the Opus but not bit-identical.
- Opus and AAC are both lossy formats, so this conversion adds a second round of lossy compression; keep the original Opus if you may need the best quality later.
Settings you can change
Before you convert Opus to AAC, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted AAC file is kept for 2 hours, then deleted.
Opus to AAC: questions and answers
Does converting Opus to AAC reduce quality?
The audio is decoded and re-encoded as AAC at the default settings, so the result is close to the Opus but not bit-identical. Opus and AAC are both lossy formats, so this conversion adds a second round of lossy compression; keep the original Opus if you may need the best quality later.
What is the difference between Opus and AAC?
Opus is a modern open lossy codec for speech and music. AAC is the lossy audio codec that succeeded MP3.
Can I change the settings when converting Opus to AAC?
Before you convert Opus to AAC, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Do I need an account to convert Opus to AAC?
No. You can convert Opus to AAC without an account; signing in raises the file-size and daily limits.
How long is my converted AAC file kept?
The AAC file you convert from Opus is kept for 2 hours, then deleted automatically.
My Opus is already lossy — does the AAC lose even more?
Opus and AAC are both lossy formats, so this conversion adds a second round of lossy compression; keep the original Opus if you may need the best quality later.
When I convert Opus to AAC, is the audio re-encoded?
The audio is decoded and re-encoded as AAC at the default settings, so the result is close to the Opus but not bit-identical.