How to convert MP3 to Opus
- 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 MP3 to Opus
NexMedia converts MP3 to Opus 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 MP3
MP3 (MPEG-1 Audio Layer III) is a lossy audio format from the early 1990s. It removes the sound listeners are least likely to notice, typically at 128 to 320 kbit/s.
It plays on virtually every device and app, which makes it the default for music files, podcasts and audiobooks.
MP3 tops out at 320 kbit/s and two channels, and every re-encode removes a little more detail.
Convert MP3 to Opus online free, no account required — Opus is a modern open lossy codec for speech and music.
Change MP3 to Opus without losing quality — convert MP3 to Opus free in your browser.
Why does my MP3 sound muffled compared to the CD? The format discards frequencies the encoder deems inaudible, and a low bitrate throws away even more — re-encoding cannot bring them back.
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.
Why convert voice recordings to Opus? It stays clear at very low bitrates, so calls and dictation shrink dramatically without becoming hard to understand.
What changes when you convert MP3 to Opus
- The audio is decoded and re-encoded as Opus at the default settings, so the result is close to the MP3 but not bit-identical.
- MP3 and Opus are both lossy formats, so this conversion adds a second round of lossy compression; keep the original MP3 if you may need the best quality later.
Settings you can change
Before you convert MP3 to Opus, 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 Opus file is kept for 2 hours, then deleted.
MP3 to Opus: questions and answers
Does converting MP3 to Opus reduce quality?
The audio is decoded and re-encoded as Opus at the default settings, so the result is close to the MP3 but not bit-identical. MP3 and Opus are both lossy formats, so this conversion adds a second round of lossy compression; keep the original MP3 if you may need the best quality later.
What is the difference between MP3 and Opus?
MP3 is a universally supported lossy audio format. Opus is a modern open lossy codec for speech and music.
Can I change the settings when converting MP3 to Opus?
Before you convert MP3 to Opus, 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 MP3 to Opus?
No. You can convert MP3 to Opus without an account; signing in raises the file-size and daily limits.
How long is my converted Opus file kept?
The Opus file you convert from MP3 is kept for 2 hours, then deleted automatically.
My MP3 is already lossy — does the Opus lose even more?
MP3 and Opus are both lossy formats, so this conversion adds a second round of lossy compression; keep the original MP3 if you may need the best quality later.
When I convert MP3 to Opus, is the audio re-encoded?
The audio is decoded and re-encoded as Opus at the default settings, so the result is close to the MP3 but not bit-identical.