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Compress Audio Online
Shrink MP3, WAV, OGG, FLAC and M4A to Opus or WAV — entirely in your browser. No upload, no signup, 100% private.
Output: Opus (.opus) — best quality per KB, plays in all modern browsers. WAV — lossless, larger file.
Frequently asked questions
What audio formats can I compress?
MP3, WAV, OGG, FLAC, and M4A as input; Opus (.opus) or WAV as output. FLAC and M4A decoding depends on the browser — Chrome and Safari handle both.
Is Opus widely supported?
Yes — Opus is the standard codec for WhatsApp voice notes, YouTube, Discord, and every modern browser.
Does audio compression reduce quality?
Opus at 128 kbps is virtually indistinguishable from CD-quality. Pick WAV if you need bit-perfect lossless.
Is my audio uploaded to a server?
No. WebCodecs runs entirely in your browser — files never leave your device.