YOUR FILES STAY ON YOUR DEVICE

Convert MP3 to OPUS

Convert MP3 to OPUS locally in your browser. No upload required. Choose output settings and download individual files or a batch ZIP.

AUDIO CONVERTER Your files stay on your device.

Input: MP3
Up to 32 MB per file · 10 minutes
View supported formats

Audio settings

Recommended settings

OPUS

Output format

Advanced settings

ChannelsBitrate

This output uses lossy compression. Converting between lossy formats may reduce audio quality. Opus uses a 48000 Hz output sample rate.

Conversion removes tags and artwork. Mono/stereo only. View supported formats

Processing happens locally in your browser. Your files are never uploaded.

Audio codec licenses & notices. Originals untouched. Verify local processing. Advertising makes separate network requests.

Three steps to your OPUS

Choose one or more MP3 files.
Adjust the output settings, then convert.
Download individual files or the batch as a ZIP.

Need a shorter clip? Trim audio with a waveform.

Audio quality

This output uses lossy compression. Converting between lossy formats may reduce audio quality. Keep your original recording.

Format compatibility and settings

MP3 input accepts MPEG Layer III CBR/VBR. Decoding removes tags and artwork and cannot restore detail lost by the original encoder. OPUS output uses an Ogg Opus container and 48 kHz PCM. Other input rates are resampled. It suits compact speech/music delivery when the recipient supports Ogg Opus.

Local processing and practical limits

The audio engine loads when needed and processes one file at a time in a worker. No upload server is involved. Cancel stops the worker. Download and clear results to release memory. Tags and artwork are omitted.

Verify local processing. Read the audio software notices.

View audio tools →

GOOD TO KNOW

Audio conversion questions.

How do I convert MP3 to OPUS?

Choose files, adjust the output settings and press Convert. Download each result or use Download All for a ZIP. All conversion happens on your device.

Does conversion affect audio quality?

This output uses lossy compression. Converting between lossy formats may reduce audio quality. Keep your original recording.

When should I choose OPUS?

Are files or metadata uploaded?

No. File names, audio bytes, duration, metadata and decoded samples stay on your device. Conversion removes tags and artwork. Engine downloads and separate advertising requests may appear in your Network panel.

Which files and browsers work?

Use a browser with WebAssembly and Web Workers. This version supports mono/stereo PCM WAV (8, 16 or 24-bit), native FLAC (8, 16 or 24-bit), standard PCM AIFF (16 or 24-bit, not AIFC), MPEG Layer III MP3 input (CBR/VBR), single-stream Ogg Vorbis and Ogg Opus. MP3 output supports CBR/VBR at 44.1 or 48 kHz. Inputs are limited to 32 MB, 10 minutes and 64 MB of decoded PCM. Batch results are limited to 64 MB. Encrypted, chained and multichannel recordings are not supported.