Opus Converter Free & Private
The state-of-the-art audio codec for voice and music. Convert Opus Audio files entirely in your browser — no upload, no account.
About Opus Audio
Opus is the most versatile and efficient audio codec available, developed by the IETF and standardised in 2012 (RFC 6716). It handles everything from 6 kbps voice to 510 kbps transparent music — outperforming every other codec across the entire bitrate range. Opus is the default codec for WebRTC (voice/video calls), Discord, WhatsApp calls, and most VoIP platforms.
Technical details
| Container | Ogg (.opus) or WebM |
| Video codecs | N/A (audio only) |
| Audio codecs | Opus (hybrid SILK + CELT) |
| Max resolution | N/A |
| Streaming | WebRTC, Ogg streaming |
| Metadata | Vorbis comments in Ogg, WebM tags |
Best for
VoIP, streaming, podcasts (quality-sensitive), Discord bots, low-bitrate audio
Advantages
- Best quality-per-bit of any audio codec
- Excellent at both voice and music
- Very low latency — ideal for real-time communication
- Completely royalty-free (IETF standard, BSD licence)
Limitations
- Not supported in Safari/iOS for file playback (works in WebRTC)
- Less widely supported for music files than MP3/AAC
- Relatively new — some hardware players don't support it
Convert Opus to other formats
Opus compatibility
Chrome, Firefox, Edge, Android, Discord, WhatsApp, Telegram; limited iOS/Safari file playback
Why privacy matters for file conversion
Most online converters upload your files to remote servers where they may be scanned, stored, or shared. This tool is different — the conversion runs in your browser via WebAssembly or the WebCodecs API. Your files stay on your device. Always.
Brought to you by
Love keeping your files private? Utterly brings the same philosophy to audio. Transcribe meetings, lectures, and voice memos — entirely on your iPhone, iPad, or Mac.
Frequently asked questions
Yes, in most comparisons. Opus at 96kbps matches AAC at 128kbps. At very low bitrates (32-64kbps), the difference is dramatic — Opus is clearly superior for voice and music.
Ecosystem inertia. MP3 has 30 years of universal support, and AAC is the Apple/YouTube default. Opus is technically superior but hasn't yet displaced them for music distribution. It dominates real-time audio (calls, gaming, streaming).
Yes, completely free with no file limits. The conversion engine runs directly in your browser — we have zero server costs for processing, so we can offer it at no charge.
Your file never leaves your device. The conversion engine runs 100% in your browser using WebAssembly or the WebCodecs API. We have no access to your files — no uploads, no logs, no data collection whatsoever.
On desktop browsers (Chrome, Firefox, Edge) files up to 500 MB convert reliably. On Safari (macOS) the practical limit is around 200 MB. On iPhone and iPad, keep files under 50 MB — iOS enforces tight memory limits for browser-based processing.
On your first visit, the browser downloads the conversion engine (24–50 MB depending on which backend is used). This is cached locally, so subsequent conversions load much faster.
Chrome, Edge, and Brave use hardware-accelerated WebCodecs when the format is supported — this is 5–10× faster than software encoding. For unsupported formats the tool falls back to ffmpeg.wasm, where Firefox typically performs best.
Utterly is a privacy-first transcription app for Apple devices. It uses on-device AI to transcribe and translate audio — no cloud, no subscription required to start. This free converter is brought to you by the Utterly team.