Free Online Audio Compressor
Control your audio's dynamic range with a full-featured compressor. Adjust threshold, ratio, attack, release, and make-up gain — or pick a preset and export instantly.
- Free
- No sign-up
- Stays on your device
Why use this tool
Full Compressor Controls
Threshold, knee, ratio, attack, release, and make-up gain — all adjustable.
5 Quick Presets
Gentle Voice, Broadcast, Podcast, Heavy, and Limiter presets for instant results.
Make-Up Gain
Compensate for gain reduction and match or exceed the original loudness.
Live Preview
Hear compression applied in real-time before exporting your file.
100% Private
All processing runs in your browser — nothing is ever uploaded.
Any Audio Format
Works with MP3, WAV, OGG, M4A, FLAC, and more.
Frequently asked questions
Audio compression reduces the dynamic range of a recording — making loud parts quieter and quiet parts relatively louder. This produces a more consistent, polished sound used in broadcast, podcasting, and music production.
Threshold sets the level above which compression kicks in. Ratio determines how much gain reduction is applied (e.g. 4:1 means for every 4 dB above threshold, only 1 dB passes through).
The knee controls how gradually compression begins around the threshold. A high knee value (soft knee) is more transparent; a low value (hard knee) is more aggressive.
A limiter (ratio 20:1, hard knee, fast attack) prevents any signal from exceeding the threshold — useful for preventing clipping before export or upload.
No. Compression runs entirely in your browser via DynamicsCompressorNode and OfflineAudioContext. Nothing is sent to a server.
Exported audio is a lossless WAV file at the original sample rate.
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