Opus to MP3 converter online — free
Quick answer Upload an .opus file — such as a WhatsApp voice message — and download it as an MP3 that plays on any phone, laptop or editor.
Change format and bitrate. Accepts MP3, WAV, OGG, M4A, FLAC, AAC, Opus, AMR and WMA — 15MB max (Pro: 20MB). Use a preset for common jobs.
Free to try · No signup required · Commercial use allowed · How we test · About VoxCraft
Convert Opus to MP3 online for free with VoxCraft. Upload an .opus file, keep MP3 selected, and download a file that opens in practically every player and editing app — no install and no account on the free tier.
Opus is a modern, efficient audio codec that is very good at speech, which is why WhatsApp uses it for voice messages. The catch is compatibility: many video editors, older phones, car stereos and desktop players still don't open .opus files. MP3 is the universal fallback.
If you saved a voice message from WhatsApp and need to send it by email, drop it into a video editor, or keep it as a normal audio file, this is the quickest route. If what you actually need is the words, skip the conversion and use voice note to text instead.
One honest note: Opus to MP3 is a lossy-to-lossy conversion, so nothing is gained in quality — the aim is compatibility. Voice messages are stored at a low bitrate to begin with, so a 128 kbps MP3 is plenty and won't make them sound worse in any way you can hear.
How it works
- Upload your .opus file (15MB max, 20MB with Pro). WhatsApp voice notes are usually well under this.
- Leave the output format on MP3. For speech, 128 kbps is a sensible quality setting.
- Tap Convert and wait a few seconds.
- Download the MP3, or send it straight to another tool such as trim or normalize.
Who uses this
WhatsApp voice messages
Save a voice note as an MP3 you can email, upload to a form, or open on a computer that can't play .opus.
Video editing
Convert a voice message to MP3 so it can be dropped onto an editor's timeline.
Podcast and interview clips
Turn an Opus recording from a chat or call app into a standard file for your editor.
Tips for better results
- For speech, 96–128 kbps is enough; a higher bitrate makes the file bigger without sounding better.
- If the voice note is very quiet, run it through Normalize after converting.
- Long voice notes can be cut down first with the trim tool.
- Need WAV for an editor instead? Switch the output to WAV — it is larger but not re-compressed.
Frequently asked questions
What is an .opus file?
Opus is an open audio codec built for speech and music at low bitrates. WhatsApp voice messages are Opus audio, usually saved with an .opus extension.
Why won't my .opus file play?
Support is patchy: some players, editors and older devices don't recognise it. Converting to MP3 solves that.
Does converting reduce quality?
Opus to MP3 re-encodes already-compressed audio, so there is a small theoretical loss and no gain. For voice messages the difference is not noticeable at 128 kbps.
Can I convert Opus to WAV instead?
Yes — choose WAV as the output format. The file will be much larger but is a good source for editing.
Is there a file size limit?
Free accounts can upload up to 15MB per file; Pro allows up to 20MB.
Is it free?
Yes within free-tier limits, with no account required to start.