OPUS to MP3 Converter

Convert OPUS audio files — including WhatsApp voice notes, Telegram recordings, and Discord audio — into universally compatible MP3 format. Free and private.

Drag and drop your OPUS audio here

Max file size 100MB. Free, no registration required.

How to Use

1

Upload your OPUS file by clicking the upload area or drag and drop

2

Select your preferred output quality (high 320kbps, medium 192kbps, or low 128kbps)

3

Click 'Convert' to transform your OPUS to MP3 format

4

Download your converted MP3 audio file

Why choose our converter?

Quality, speed, and security for all your conversions.

High-quality conversion

Precise file conversion without any loss of quality.

100% browser-based

Files never leave your device. All processing happens locally.

Works on all devices

Computer, tablet, or smartphone — any browser works.

Fast processing

Convert files in seconds with our optimized engine.

No registration

Start converting immediately. No sign-up needed.

Batch conversion

Convert multiple files at once to save time.

About This Tool

This free OPUS to MP3 converter turns .opus audio files — the format used by WhatsApp voice notes, Telegram audio messages, and Discord recordings — into universally playable MP3 files that open on any device, car stereo, or media player. Drop in your .opus file and download an MP3 in seconds. Everything runs in your browser using FFmpeg compiled to WebAssembly, so your voice recordings never leave your device.

Why You Probably Have an OPUS File

  • WhatsApp voice notes — When you export or download a WhatsApp voice message, it saves as PTT-YYYYMMDD-WAXXXX.opus. Most built-in Windows and car-stereo players refuse to play .opus — converting to MP3 fixes that instantly.
  • Telegram audio — Telegram voice messages and forwarded audio are compressed as OPUS for smaller file sizes. Perfect for chat, terrible for archival.
  • Discord voice recordings — Bots like Craig export multi-track OPUS files. Great quality, poor compatibility with editing software.
  • WebRTC and video-call recordings — Zoom, Google Meet, and open-source conferencing tools often dump raw audio as OPUS in WebM containers.
  • YouTube downloads — When you download YouTube audio with tools like yt-dlp at the highest quality, the raw audio stream is usually OPUS.

Why OPUS Is Hard to Play and MP3 Isn't

OPUS is a modern, open-source codec (2012) with excellent quality at low bitrates — that's why WhatsApp and Discord chose it. The problem: OPUS was built for streaming, not listening on random devices. Windows Media Player, older car stereos, voicemail systems, court evidence platforms, transcription services, and many DAWs (Audacity, GarageBand, Adobe Audition) either refuse to open .opus or require an extra plugin. MP3, despite being older and technically less efficient, plays on literally everything built since 2000. Converting OPUS → MP3 costs you a few KB of extra file size and buys you universal compatibility.

How the Conversion Works

We decode the OPUS stream using the reference libopus decoder (compiled to WebAssembly via FFmpeg) and re-encode to MP3 using the LAME MP3 encoder at your chosen bitrate. For voice notes (the most common case), 128kbps is the sweet spot — indistinguishable from the original OPUS to the human ear, with files typically around 1 MB per minute. For music or high-fidelity recordings, choose 320kbps. Because OPUS is lossy and MP3 is lossy, this is a transcode, not a repack — but the perceptual quality loss is minimal for normal voice content.

Tips for WhatsApp Voice Notes Specifically

  • Export from WhatsApp first — Long-press the voice message → Share → save to Files (iOS) or Downloads (Android). Or export the whole chat: Chat settings → Export Chat → Include Media. The .opus files land in a zip.
  • Check the filename — WhatsApp names voice notes PTT-YYYYMMDD-WAXXXX.opus. "PTT" means "push to talk". If the extension is .ogg or .m4a instead, you have a different WhatsApp export format — we have converters for those too.
  • 128kbps is plenty for speech — WhatsApp encodes voice at around 24 kbps OPUS. Re-encoding to MP3 at 320 kbps just wastes disk space; 128 kbps MP3 preserves everything a human ear can hear in the original.
  • Batch conversion for whole chat exports — If you exported an entire chat with hundreds of voice notes, upload them all at once. Converting one-by-one is tedious.

OPUS to MP3 vs OPUS to WAV vs Keeping OPUS

Keep OPUS if you only play the file on VLC, Android, iOS (iOS 17+), or modern browsers — there's no quality gain in converting. Convert to MP3 if you need universal compatibility, want to import into a DAW that doesn't support OPUS, are submitting voice evidence to a service that requires MP3, or want to send the audio to someone on Windows Media Player or an older car stereo. Convert to WAV if you're doing forensic audio work, transcription with specialized software, or need lossless editing headroom — use our WAV tools for the reverse path.

Privacy: Why This Tool Matters for Voice Notes

Voice notes often contain sensitive information — passwords spoken aloud, medical conversations, private family audio. Most free online OPUS converters upload your files to their servers, where they may be logged, cached, or retained. FastConvert runs entirely in your browser via WebAssembly — your voice recordings are never sent over the network. Close the tab and nothing remains.

Frequently Asked Questions

What is an OPUS file?
OPUS is a modern open-source audio codec designed for low-latency streaming and speech. It's the format WhatsApp uses for voice notes, Telegram uses for audio messages, and Discord uses for voice channels. OPUS delivers excellent quality at very low bitrates (often 24-64 kbps for speech), but many non-browser media players can't open it natively.
How do I convert a WhatsApp voice note (.opus) to MP3?
Export the voice note from WhatsApp (long-press → Share → Save to Files or Downloads). Then upload the .opus file here, pick your quality, and download the MP3. The whole process takes under 10 seconds and your audio is processed entirely in your browser.
Why won't Windows Media Player open my .opus file?
Windows Media Player added basic OPUS support in Windows 10 version 1809 (2018), but many users still have older versions or restricted builds where .opus won't play. Converting to MP3 guarantees playback on any Windows machine, car stereo, or legacy device without needing codecs or plugins.
Does OPUS to MP3 conversion lose quality?
Yes, slightly — both OPUS and MP3 are lossy formats, so transcoding involves a second compression pass. However, for voice recordings (the main use case) the perceptual difference is imperceptible at 128 kbps MP3 or higher. For music, use 320 kbps to minimize loss.
What bitrate should I choose for voice notes?
128 kbps MP3 is perfect for speech — indistinguishable from the original to your ears, with files around 1 MB per minute. WhatsApp voice notes are encoded at only 24 kbps OPUS, so encoding to 320 kbps MP3 wastes space without adding any audible quality.
Can I convert multiple OPUS files at once?
Yes — upload multiple .opus files and they'll all convert in sequence. Useful for converting an entire WhatsApp chat export (often hundreds of voice notes) in one batch.
What's the maximum file size?
Up to 100 MB per file — which covers multi-hour podcast recordings, long voice messages, and full conference-call exports. If you have something bigger, split it first with an audio editor.
Is this safe for private voice recordings?
Yes. All conversion happens in your browser using WebAssembly. Your OPUS files are never uploaded to our servers, never logged, and never cached anywhere. Close the tab and nothing persists.
Can I convert OPUS to MP3 on iPhone or Android?
Yes — this tool works in mobile Safari and Chrome. On iPhone, share the .opus file from WhatsApp to Files, then open fastconvert.ai in Safari and upload from Files. On Android, the .opus usually lands in Downloads or WhatsApp/Media/WhatsApp Voice Notes/ directly — just upload from there.
What's the difference between OPUS and OGG?
OGG is a container format; OPUS is a codec. WhatsApp voice notes sometimes arrive as .opus and sometimes as .ogg — both may contain OPUS-encoded audio. This tool handles both. If the .ogg file contains Vorbis audio instead of OPUS, use our OGG to MP3 converter.

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