Audio Notch Filter
Apply a notch filter to remove a specific frequency from audio. Cuts a narrow band while leaving surrounding frequencies intact. Perfect for eliminating 50/60 Hz hum, feedback, or other narrow-band interference.
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Complete Guide: Audio Notch Filter
Everything you need to know about using this tool effectively
The Audio Notch Filter removes a narrow band of frequencies from your audio while leaving everything else intact. This is the standard tool for eliminating 50/60 Hz electrical hum, feedback frequencies, or other narrow-band interference. Processing happens entirely in your browser with no uploads.
This tool applies a notch (band-reject) BiquadFilter via the Web Audio API. It creates a sharp dip at the target frequency, effectively removing it from the audio while preserving frequencies on either side.
Removing Electrical Hum
Power line hum at 50 Hz (Europe/Asia) or 60 Hz (Americas) is one of the most common audio problems. A notch filter at the hum frequency removes it cleanly without affecting the rest of the audio.
Feedback Elimination
When a microphone feeds back at a specific frequency, a notch filter can remove exactly that frequency without cutting a broad range of sound like a parametric EQ would.
Removing Specific Interference
Electronic equipment, lighting rigs, and HVAC systems can introduce tonal interference at fixed frequencies. A notch filter targets the offending frequency precisely.
Audio Forensics and Cleanup
Remove narrow-band noise from recordings while preserving speech intelligibility. The surgical precision of a notch filter keeps the surrounding audio intact.
Upload Your Audio
Drag and drop or click to upload the audio file with the unwanted frequency.
Set the Target Frequency
Enter the frequency you want to remove. Common targets are 50 Hz or 60 Hz for hum, or whatever frequency is causing the problem.
Preview the Result
Listen to verify the problem frequency is gone and the rest of the audio is preserved.
Download
Download the cleaned audio file.
For power line hum, try 50 Hz (Europe/Asia) or 60 Hz (Americas) first
You may also need to notch harmonics - if the fundamental hum is at 60 Hz, try also filtering 120 Hz, 180 Hz, and 240 Hz
A notch filter is more precise than a high-pass filter for removing low-frequency hum since it preserves bass content
If you are unsure of the problem frequency, try different values while listening until the interference disappears
What is the difference between a notch filter and a high-pass filter?
A high-pass filter removes all frequencies below a cutoff point. A notch filter removes only a narrow band at a specific frequency, leaving both higher and lower frequencies intact. Use a notch when you want to target one problem frequency without affecting the rest.
How do I know what frequency to set?
For electrical hum, start with 50 Hz or 60 Hz depending on your country's power grid. For other interference, try sweeping the frequency while listening until the problem disappears.
Will the notch filter affect my voice recording?
A notch filter is very narrow, so it removes only the target frequency and its immediate neighbors. Unless your voice or music has significant energy at exactly that frequency, the audible impact on the desired audio is minimal.
Does this upload my files?
No. All processing runs locally in your browser. Your files never leave your device.