How much smaller will Opus files be than my MP3s?

For speech, dramatically: a 128 kbps MP3 podcast re-encoded to 48 kbps Opus drops to roughly a third of the size with comparable intelligibility. For music the savings are more modest, because Opus should stay at 96-128 kbps to avoid worsening MP3's existing artifacts.

What won't play Opus files?

Most car head units, iTunes and the Apple Music app, older MP3 players, and plenty of home audio gear. Opus rules real-time and messaging audio — Discord, WhatsApp, WebRTC — but hardware decoder support still lags far behind MP3.

Is Opus a good archive format for my MP3 collection?

No — archiving means never transcoding lossy to lossy. Opus copies make sense as small distribution or mobile files, while the MP3s (or better, any lossless sources you still have) remain the masters.

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Convert MP3 to OPUS

Turn MP3 files into OPUS in seconds — free, secure, and no signup required.

Free tier: 5 conversions/day, files up to 50 MB, ad-supported. Need more? See Pro plans →

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Lightning-fast conversionsProcess files in seconds, not minutes
All major audio formatsMP3, WAV, AAC, FLAC & more
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Files auto-deleted in 1 hourGDPR-friendly: we never keep your files

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Opus is the most efficient modern audio codec, sounding excellent at very low bitrates. Converting MP3 to Opus is ideal for voice, podcasts, and bandwidth-sensitive streaming.

Convert MP3 to OPUS – Free Online MP3 to OPUS Converter

Why convert MP3 to OPUS?

Superb quality at low bitrates — great for voice and podcasts.
Royalty-free, open standard used by WhatsApp, Discord, and WebRTC.
Smaller files than MP3 with equal or better clarity.

Tip: Older hardware players may not support Opus — stick with MP3 for legacy devices.

How to convert MP3 to OPUS

Upload your MP3 file using the area above.
OPUS is preselected as the target format.
Click Start and wait for the conversion to finish.
Download your converted OPUS file.

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Convert MP3 to OPUS

Convert MP3 to OPUS – Free Online MP3 to OPUS Converter

Why convert MP3 to OPUS?

How to convert MP3 to OPUS

MP3 to OPUS — Frequently Asked Questions