Audio CompressorApply dynamic range compression to reduce volume differences in audio.
Audio Compressor
Apply dynamic range compression to reduce volume differences in audio.
Upload Audio
Drop your audio file or click to browse.
Set Parameters
Adjust threshold, ratio, attack, release, and knee settings.
Download
Download your compressed audio file.
What Is Audio Compressor?
The Audio Compressor applies dynamic range compression to reduce the difference between loud and quiet parts of audio. This makes quiet parts more audible and prevents loud peaks from distorting. Essential for voice recordings, podcasts, and music mastering. The tool uses the Web Audio API's DynamicsCompressorNode with adjustable threshold, ratio, attack, release, and knee parameters. Preview the compression in real-time with visual gain reduction metering, then download the processed audio.
Why Use Our Audio Compressor?
- Adjustable threshold, ratio, attack, release, and knee parameters
- Visual gain reduction meter shows compression in action
- Real-time preview before downloading
- Browser-based processing — files stay private
Common Use Cases
Podcast Production
Even out volume differences between speakers or recording conditions.
Voice Recording
Make whispers and loud speech more consistent in volume.
Music Mastering
Control dynamic range for consistent playback across devices.
Broadcast
Prepare audio for broadcast standards that require controlled dynamics.
Technical Guide
The compressor uses the Web Audio API's DynamicsCompressorNode, which implements a feed-forward compressor with look-ahead. Parameters include: threshold (-100 to 0 dB) — the level above which compression starts; ratio (1:1 to 20:1) — how much the signal is reduced above threshold; knee (0-40 dB) — how gradually compression engages; attack (0-1 seconds) — how quickly compression responds to transients; release (0-1 seconds) — how quickly compression stops after signal drops below threshold. The audio is processed through an OfflineAudioContext with the DynamicsCompressorNode in the signal chain. The node's reduction property provides real-time gain reduction readings for metering. Post-compression, a makeup gain GainNode can be applied to restore overall volume.
Tips & Best Practices
- 1Start with gentle settings: -20 dB threshold, 4:1 ratio, 10ms attack, 100ms release
- 2Use slower attack times (20-50ms) to preserve transients in music
- 3For voice, faster attack (5-10ms) and slower release (200-300ms) works well
- 4Apply normalization after compression to maximize the overall volume
Related Tools
Audio Normalizer
Normalize audio volume to a consistent level automatically.
Audio Tools
Audio Noise Gate
Apply a noise gate to reduce background noise in quiet sections.
Audio Tools
Audio Equalizer
Apply EQ adjustments to boost or cut frequency bands in audio.
Audio Tools
Audio Volume Changer
Increase or decrease the volume of any audio file.
Audio Tools
MP3 to WAV Converter
Convert MP3 audio files to WAV format instantly in your browser.
Audio Tools
WAV to MP3 Converter
Convert WAV audio files to compressed MP3 format in your browser.
Audio ToolsFrequently Asked Questions
QWhat is dynamic range compression?
QIs compression the same as making things louder?
QWhat's a good ratio for voice?
QWill it make my audio sound squashed?
QIs processing done locally?
About Audio Compressor
Audio Compressor is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.