Audio Converter

Get Maximum Efficiency from Any MP3 with Opus

Upload your MP3 and download an Opus file. The most advanced lossy audio codec available — designed for low-latency streaming, VoIP, and WebRTC at bitrates MP3 cannot match.

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Get Maximum Efficiency from Any MP3 with Opus

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Audio Format Converter

Upload any audio file, choose an output format, and download the converted result. Supports MP3, WAV, FLAC, AAC, OGG, ALAC, WMA, Opus and M4A.

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Audio codec efficiency comparison showing Opus quality

The Most Efficient Lossy Codec Available

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The Most Efficient Lossy Codec Available

Opus consistently outperforms MP3, AAC, and Vorbis at every bitrate in listening tests. At 64 kbps, Opus sounds better than MP3 at 128 kbps. At 96 kbps it is considered transparent for most listeners. Standardized by IETF in RFC 6716 (2012).

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WebRTC and real-time audio streaming with Opus codec

Built for WebRTC and Real-Time Streaming

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Built for WebRTC and Real-Time Streaming

Opus is the mandatory codec for WebRTC audio in Chrome, Firefox, and Safari. It is used by Discord, Zoom, Google Meet, and WhatsApp for voice and music streaming. Converting MP3 assets to Opus ensures compatibility with modern real-time communication pipelines.

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Opus codec handling both speech and music audio

Handles Both Speech and Music

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Handles Both Speech and Music

Opus uses two underlying codecs: SILK (optimized for speech at low bitrates) and CELT (optimized for music and general audio). It switches between them automatically based on the input signal, making it equally effective for podcasts, music, and voice calls.

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How It Works

Three steps to Opus audio

Upload your MP3 file

Drop your MP3 file onto the tool or click to browse. The format is validated before conversion starts.

Convert to Opus

Click "Convert". The file is uploaded and processed by FFmpeg on our servers, encoded as Opus inside an OGG container.

Download your Opus file

When conversion is complete, preview the output in the browser player, then download your .opus file.

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Deep Dive

MP3 vs Opus: The Modern Codec Difference

MP3 was designed in 1991. Opus was standardized in 2012 with three decades of codec research behind it. The efficiency gap is significant.

WebRTC, VoIP, and streaming applications using Opus audio codec

Opus: IETF Standard, Royalty-Free

Standardized in RFC 6716 by the Internet Engineering Task Force in 2012, Opus was developed by Xiph.Org and the Mozilla Foundation. It is royalty-free and patent-unencumbered, the same terms as OGG Vorbis and FLAC.

StandardIETF RFC 6716 (2012)

Container.opus (OGG container with Opus codec)

LicenseRoyalty-free, patent-unencumbered

Bitrate Efficiency vs MP3 and AAC

Opus at 64 kbps scores higher in transparency listening tests than MP3 at 128 kbps. Opus at 96 kbps matches or exceeds AAC at 128 kbps. For streaming and real-time applications this halves bandwidth requirements.

Opus 64 kbpsEquivalent perceived quality to MP3 128 kbps

Opus 96 kbpsTransparent for most music content

VoIP target6 to 24 kbps for speech-only applications

Converting MP3 to Opus cannot recover data lost in the original MP3 encoding. Use the highest output bitrate available to minimize generation loss.

WebRTC and Browser Native Support

Opus is the mandatory audio codec for WebRTC in all browsers (RFC 7874). Chrome, Firefox, Safari, and Edge all support it natively for both real-time communication and standard media playback via the HTML5 Audio API.

WebRTCMandatory codec per RFC 7874

Browser supportChrome, Firefox, Safari, Edge (all modern versions)

Used byDiscord, Zoom, Google Meet, WhatsApp, Slack

Variable Bitrate and Low Latency

Opus supports both constant and variable bitrate encoding, and is designed for low-latency real-time use. Frame sizes range from 2.5 ms to 60 ms, making it suitable for applications where latency is critical, such as live audio and gaming.

Frame sizes2.5 ms to 60 ms

Bitrate range6 kbps (speech) to 510 kbps (music)

ModesSILK (speech), CELT (music), hybrid

The .opus file extension wraps Opus audio in an OGG container. Most modern media players recognize both .opus and .ogg extensions.

Benefits

Why Use This Converter

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Best-in-Class Efficiency

Opus outperforms MP3, AAC, and Vorbis at every bitrate. Half the bandwidth for equivalent quality.

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Fast Conversion

Most MP3 files convert to Opus in under 30 seconds on our dedicated servers.

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FFmpeg-Powered

Industry-standard FFmpeg handles every conversion with accurate sample rates and channel mapping.

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WebRTC and Browser Native

Mandatory codec for WebRTC. Supported natively in Chrome, Firefox, Safari, and Edge.

Who Uses It

Who Converts MP3 to Opus

WebRTC developers, live streamers, VoIP engineers, and game developers all depend on Opus for efficient low-latency audio.

WebRTC developers, streamers, and game developers using Opus audio

WebRTC and Real-Time Communication Developers

Opus is the mandatory codec in WebRTC. If you are building browser-based voice chat, video conferencing, or real-time audio streaming, Opus is the only choice that works across all browsers without fallback.

StandardRFC 7874 mandates Opus for WebRTC audio

Discord Bot and Server Audio

Discord transmits all voice audio as Opus internally. Converting MP3 sound assets to Opus before streaming through a Discord bot eliminates a re-encode step and reduces latency.

Live Streamers and Podcast Producers

OBS Studio, Liquidsoap, and Icecast all support Opus for audio streaming. Converting existing MP3 music beds and intros to Opus reduces stream bitrate while maintaining perceived quality.

Game Developers

Godot 4 supports Opus natively alongside Vorbis. Unity and Unreal Engine can import Opus via plugin. For online multiplayer games with voice chat, Opus is the industry standard.

VoIP and Telecommunications Engineers

Asterisk, FreeSWITCH, and Kamailio all support Opus as a high-quality VoIP codec. It replaces G.711 and G.722 with dramatically better quality at the same or lower bitrate.

Telephony platformsAsterisk, FreeSWITCH, Kamailio, Jitsi

Open-Source and Linux Audio

PipeWire, PulseAudio, and GStreamer all support Opus natively. Linux-based audio workflows increasingly prefer Opus for its superior efficiency and fully open licensing.

Converts using FFmpeg on dedicated servers.

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Related Tools

Frequently Asked Questions

Does converting MP3 to Opus improve audio quality?

Re-encoding from one lossy format to another always introduces some generation loss. The output Opus cannot exceed the quality of the source MP3. However, at a higher output bitrate the loss is minimal, and Opus is significantly more efficient than MP3 at the same perceived quality.

Which apps and platforms support Opus playback?

All modern web browsers (Chrome, Firefox, Safari, Edge) support Opus natively. VLC, foobar2000, mpv, and FFplay all support it. Discord, Zoom, and Google Meet use Opus internally. Android 5+ supports Opus natively; iOS supports it via the web view.

What is the difference between OGG and Opus?

OGG is the container format. Opus is the audio codec. A .opus file uses an OGG container with Opus-encoded audio, while a .ogg file typically contains Vorbis-encoded audio. Both use the same container but different codecs.

What bitrate should I use for Opus?

For music, 96 to 128 kbps is considered transparent for most listeners. For speech-only content (podcasts, VoIP), 24 to 48 kbps is sufficient. For WebRTC voice chat, 16 to 32 kbps is typical.

Is there a file size limit?

The upload limit is 100 MB per file. Most typical MP3 tracks are well within this limit.

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