MP3 – MPEG-1 Audio Layer III
MP3 (MPEG-1 Audio Layer III) is a widely used audio format supported by this browser-based converter.
MP3 to Opus Converter
Choose an MP3 file to convert to an Opus file. Works completely in your browser. Free and no ads.
Select a file to convert
Drop your MP3 file here or choose one from your device
Private and Secure: Files never leave your device. Media conversion runs entirely in your browser.
Quick guide
About MP3 to Opus conversion
Opus – Opus Audio
Opus (Opus Audio) is a widely used audio format supported by this browser-based converter.
Quick guide
How to Convert MP3 to Opus
- 01
Choose your MP3 file
Select or drag your MP3 file from your device into the converter.
- 02
Convert to Opus
Choose Opus as the output format, then start the local browser conversion.
- 03
Download your Opus file
Save the finished Opus file to your device.
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Transcribe audio or video with Whisper Web
Transcribe audio and video to accurate text in seconds.
Updated
| Limit | Free | Unlimited |
|---|---|---|
| Price | US$0 | US$20/mo or US$120/yr |
| Each file | 20 min / 200 MB | Up to 10 hours or 5 GB |
| Daily file limit | None | None |
| Processing | Locally in the browser | Optional cloud upload |
| Languages | 100+ | 100+ |
Frequently asked questions
Is Whisper Web really free? Do I need an account?
In free local mode, audio is processed in your browser and is not uploaded. No account is required. Each file can be up to 20 minutes and 200 MB. There is no daily file-count limit. For longer files, Whisper Web Unlimited offers optional cloud processing with a per-file limit of 10 hours and 5 GB.
What is the official Whisper Web site?
The official Whisper Web site is https://whisperweb.dev. Other domains may use a similar name. Free local mode on whisperweb.dev runs in your browser without an account; each file is limited to 20 minutes and 200 MB.
Does my audio leave my device?
In free local mode, audio is processed in your browser and is not uploaded. Model files still download over the network the first time you use a model. Whisper Web Unlimited is an optional cloud workflow for larger files (up to 10 hours and 5 GB per file).
What if a result says Whisper Web but the address is different?
If a result says “Whisper Web” but the address is not whisperweb.dev, it is not the official Whisper Web site. Open https://whisperweb.dev to use free local transcription in your browser (20 minutes / 200 MB per file, no account).
How do I convert MP3 to Opus?
Choose your MP3 file, select Opus, and click Convert. When processing finishes, download the converted file.
Is this MP3 to Opus converter free?
Yes. This converter is free to use, with no account, subscription, or ads.
Are my MP3 files uploaded?
No. Conversion runs locally in your browser, so your media file stays on your device.
What happens when converting MP3 to Opus?
The converter re-encodes the selected audio and creates a file in Opus format.
Which browsers and devices support MP3 to Opus conversion?
The converter works in current desktop browsers on Windows, macOS, Linux, and ChromeOS. Performance depends on file size and device hardware.