How to use the MP3 to OPUS converter
- Choose your MP3 file or drop it on the box.
- Pick a quality. 96–128 kbps Opus sounds as good as 192 kbps MP3.
- Click "Convert to OPUS". A progress meter shows how far along it is.
- Download your OPUS and listen to it right on the page.
Why convert MP3 to OPUS?
Opus gives the same quality as MP3 at roughly half the bitrate, which is great for saving phone space, voice messages and web audio.
- MP3: lossy: some detail is removed.
- OPUS: best quality per kilobyte of any common codec.
- OPUS: excellent for speech.
96 kbps Opus sounds about as good as 192 kbps MP3 for most music.
MP3 vs OPUS
| MP3 | OPUS | |
|---|---|---|
| Full name | MPEG-1 Audio Layer III | Opus Interactive Audio Codec |
| Type | Audio | Audio |
| Created by | the Fraunhofer Institute and MPEG (1993) | the IETF (Xiph.Org and others) (2012) |
| Compression | Lossy | Lossy |
| Codec | MP3 | Opus |
| Best for | Music, podcasts, audiobooks and ringtones | Voice notes, calls, YouTube audio and podcasts |
| Plays on | Every phone, computer, car stereo, smart speaker and browser | Android, Chrome, Firefox and VLC; some car stereos and older Apple apps cannot play .opus files |
Does converting MP3 to OPUS lose quality?
Both formats are lossy, so converting adds a small amount of loss. Use the same or a higher bitrate than your MP3 (192 kbps covers most files) and the change is inaudible.
How long does it take?
A few seconds for a song, and under a minute for an hour-long recording on most computers.
What is an MP3 file?
MP3 is the most widely used audio format in the world. It removes sounds people are unlikely to hear, shrinking a song to about a tenth of its CD size. At 192 kbps or higher most listeners cannot tell it from the original, and every device plays it. Its patents expired in 2017, so it is now free to use.
What is an OPUS file?
Opus is a modern open codec that beats MP3 and AAC at every bitrate, especially for speech. WhatsApp voice notes, Discord, Zoom and YouTube all use Opus.
Frequently asked questions
How much does the MP3 to OPUS converter cost?
Nothing. It is free with no registration, no watermark and no limit on how many files you convert.
Are my files safe?
Yes. Files are converted locally in your browser and are never uploaded. When you close the page, nothing is left behind.
Will the OPUS sound as good as the MP3?
Both formats are lossy, so converting adds a small amount of loss. Use the same or a higher bitrate than your MP3 (192 kbps covers most files) and the change is inaudible.
Can I convert OPUS back to MP3?
Yes, use the OPUS to MP3 converter.
An MP3 sounds thin or has artefacts. What should I do?
It was probably encoded at a low bitrate. Re-encoding cannot restore it; find a better source.
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other modern mobile browsers. Short files work best on phones; for long or high-resolution videos a computer is faster.