MP3 to Opus - Online Audio Converter

Convert MP3 to Opus online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.

Convert MP3 to Opus

[+] Drop MP3 audio here or click to select MP3

Output format

Opus (Opus)

Mode[i]

Simple Advanced

Quality[i]

Sample Rate[i]

Channels[i]

About MP3 to Opus

Convert MP3 to Opus. MP3 is the MPEG-1 Layer III codec, playable on virtually every device. Opus adapts from 6 kbps speech to 510 kbps music with low latency. CD-era hardware may not decode it; use MP3 for legacy players..

Why convert MP3 to Opus?

Smaller files with Opus lossy compression.
Keep quality where supported.
Private, no upload - runs in your browser.

MP3 vs Opus

Codec	libmp3lame	Opus
Compression	lossy	lossy
Sample behavior	Quality set by bitrate	Quality set by bitrate
Typical use	MP3 is the MPEG-1 Layer III codec, playable on virtually every device.	Opus adapts from 6 kbps speech to 510 kbps music with low latency.

When not to convert MP3 to Opus

Skip Opus for archival masters: lossy compression discards detail, so keep the MP3 original.
Keep a master copy: repeated exports stack small losses, so archive MP3 before batch Opus shares.

Limits

Starting point: MP3 - Lossy compressed music near 128-256 kbps. Repeated re-encoding stacks artifacts; convert from the master. CD-era hardware may not decode it; use MP3 for legacy players. Encode Opus (Opus) from MP3 at 256k for music or 128k for speech, starting from the master.

How conversion works

Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.

Related conversions

FAQ

How do I convert MP3 to Opus?

Drop your MP3 file onto this page, choose quality and codec settings, then click Convert. The result downloads as Opus instantly. All processing runs in your browser.

What codec is used for Opus?

The default codec for Opus is Opus. You can change audio parameters in Advanced mode.

How do you store my files?

We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.