Convert MP3, WAV, OGG, FLAC, AAC, M4A to WebM (Opus). Fast, free, high-quality. No signup needed.
Supported: MP3, WAV, OGG, FLAC, AAC, M4A, WMA, OPUS, AMR · Max 50MB
or
Max size: 50MB · Files auto-deleted · No watermarks
🔒 Processing securely on our server. Please keep this tab open.
Your WebM file is ready to download
Original
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Converted
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Saved
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Opus Codec
Best quality at any bitrate — better than MP3
Smaller Files
30-50% smaller than MP3 at same quality
Web Optimised
Native browser support, no plugins needed
100% Private
Files auto-deleted after 10 minutes
Smart Trim
Cut your audio before converting
All Devices
Works on phone, tablet and desktop
📤 Output: WebM (Opus codec)
Common questions about audio conversion
WebM with Opus codec is a modern, open-source audio format. Opus provides better audio quality than MP3 at the same bitrate, making your audio files smaller without sacrificing sound quality.
Typically 20-50% smaller than the original. A 10MB MP3 can become 5-7MB WebM at the same perceived quality. Results depend on the source file quality.
At 128kbps or higher, Opus quality is indistinguishable from the original for most listeners. Lower bitrates (64kbps) still sound better than equivalent MP3.
Yes! All files are processed on our secure servers and automatically deleted after 10 minutes. We never listen to, store, or share your audio.
All modern browsers support WebM Opus: Chrome, Firefox, Edge, Opera, and mobile browsers. Safari added support in 2020.
Yes! Use the Trim Audio option to specify start and end time in seconds. Great for cutting out silence or extracting a specific part of a long recording.