Free Online Noise Reduction: Remove Background Noise from Audio

Background noise is one of the most common problems in audio recording. Whether you're recording a podcast, voiceover, or field recording, unwanted noise can ruin an otherwise great take. Here's how to remove background noise from audio online for free.

How Noise Reduction Works

Our Noise Reducer uses a noise gate approach. It analyzes the audio signal and applies a smooth gain reduction to sections that fall below a configurable threshold. The attack and release controls determine how quickly the gate opens and closes, allowing for natural-sounding results.

How to Reduce Noise Using AudioKit

1. Open the Noise Reducer — Go to our Noise Reducer tool.
2. Upload your audio — Upload your recording.
3. Adjust the threshold — Set the noise threshold in dB. Signals below this level will be attenuated.
4. Set attack and release — Adjust how quickly the gate responds to changes in volume.
5. Process and preview — Apply the effect and listen to the result.

Tips for Best Results

• Record clean audio first — Noise reduction works best when the original recording is as clean as possible.
• Use gentle settings — Aggressive noise reduction can create artifacts. Start with a low threshold and increase gradually.
• Check the silent sections — Listen to what happens in the quiet parts. If you hear pumping or breathing artifacts, reduce the threshold.
• Different noise types — Constant background noise (hiss, hum) is easier to remove than irregular noises (clicks, pops, doors).