Audio Compressor (Reduce File Size)
Shrink an audio file's size with bitrate control and optional mono downmix. Private, no upload.
🔒 Audio is decoded and edited on your device — recordings never leave your browser.
Compress audio that's too big to email, upload or attach: re-encode it as a lower-bitrate MP3 — with an optional mono downmix that halves speech recordings again.
About Audio Compressor (Reduce File Size)
Compress an audio file in your browser. File size for audio is simply bitrate × duration, so this tool shrinks files the honest way: re-encoding to MP3 at a bitrate you control (64–320 kbps), with an optional mono downmix that halves the size of stereo speech recordings. A one-hour stereo WAV (~600 MB) becomes a ~43 MB MP3 at 96 kbps mono. Everything runs locally — no upload, no queue.
How to use Audio Compressor (Reduce File Size)
- 1Drop your audio file (any format your browser decodes).
- 2Pick a bitrate — 96 kbps is a good speech default — and tick mono if it's a voice recording.
- 3Re-encode and download the smaller MP3.
Why use Audio Compressor (Reduce File Size)?
- ✓Fitting lectures and interviews under email/LMS attachment limits.
- ✓Shrinking podcast drafts before sharing for review.
- ✓Mono downmix: same words, half the bytes, for any speech recording.
Frequently asked questions
How small will my file get?+
Output size ≈ bitrate ÷ 8 × seconds. At 96 kbps, one minute is ~0.7 MB regardless of the input size; a 50 MB recording of 10 minutes becomes ~7 MB.
What's the best bitrate for speech?+
96 kbps mono is the sweet spot for clear voice recordings; 64 kbps still sounds fine for phone-quality notes. Keep music at 128–192 kbps.
Does mono hurt quality?+
For a single speaker there's usually no audible difference — most voice recordings are effectively mono already, so downmixing just removes duplicated data.
Is my audio uploaded?+
No — compression happens entirely in your browser.
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