Low Pass Filter Audio Online
Smooth harsh top-end and shape warmer tone quickly.
Preset Saving
Turn on saving to keep reusable effect presets. See plansClose tab = presets are only kept locally unless saved.
Effect Controls
Download uses server Pedalboard processing when available, with browser fallback.
Soften High-End Harshness Quickly
This low pass filter audio online tool helps tame bright, brittle, or noisy highs in vocals, synths, and FX layers.
Preview playback runs instantly in your browser. Download rendering uses server Pedalboard processing when available, with browser fallback for reliable output.
Cutoff Frequency
Lower the cutoff to remove more high-frequency content.
Resonance (Q)
Shape edge around cutoff for smooth or more character-heavy results.
Wet / Dry Mix
Blend filtered and original signal to keep clarity while reducing harshness.
How to Use This Low-Pass Filter
- 1. Upload audio.
- 2. Lower cutoff to reduce highs.
- 3. Adjust Q for tone character.
- 4. Compare with bypass.
- 5. Download processed WAV.
Best Use Cases
- Harsh vocal smoothing
- Lo-fi tone shaping
- Sound design darkening
- Top-end control before mastering
Pair With Bitcrusher
Use low-pass after bitcrusher to tame aggressive digital highs and create smoother lo-fi textures.
Related Audio Tools
Build a full workflow by combining effects and comparing outputs across tools.