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Online Audio Noise Reducer - Free Background Hum Remover

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or click to browse — MP3, WAV, OGG, FLAC, M4A

100% private · processed entirely in your browser
Noise Reduction Settings
Hum Base Frequency 50 Hz
Hum Removal Strength 75%
Noise Gate Threshold -45 dB
Gate Reduction Amount -30 dB
Harmonics to Remove 5
Spectrum Analyzer
SPECTRUM — ORIGINAL
Original Processed
Frequently Asked Questions
What causes background hum in audio?
Background hum is typically caused by electrical interference from power lines — 50 Hz in Europe/Asia and 60 Hz in North America. This electromagnetic interference can be picked up by cables, microphones, or audio interfaces, resulting in a persistent low-frequency buzzing sound along with its harmonic overtones.
How does this noise reduction tool work?
This tool uses precise notch filters to eliminate hum at the base frequency and its harmonics, combined with a noise gate to suppress low-level background noise. All processing happens locally in your browser using the Web Audio API — no audio data is ever uploaded to any server.
Is my audio file safe and private?
Absolutely. 100% of the processing is done client-side in your browser. Your audio files never leave your device. There are no uploads, no servers, and no third parties involved. You can use this tool offline after the page loads.
Which audio formats are supported?
We support MP3, WAV, OGG, FLAC, M4A, and AAC formats. The processed output is always exported as a 16-bit WAV file for maximum quality and compatibility with any audio software or device.
What is a Noise Gate and how does it help?
A Noise Gate silences audio signals that fall below a certain volume threshold. This effectively removes quiet background hiss, hum, and ambient noise during pauses in speech or music, making your recording sound cleaner and more professional.
Will noise reduction affect my audio quality?
When used moderately, the notch filters are extremely narrow and only remove specific hum frequencies without affecting the rest of your audio. Aggressive settings may slightly alter the tonal character. We recommend starting with the Moderate preset and adjusting to your needs.
Can I remove other types of background noise?
This tool is optimized for steady-state hum and low-level background noise. For more complex noise like traffic, wind, or crowd sounds, you may need AI-based solutions. However, the noise gate can help reduce general low-level background noise between speech or musical passages.
Why is the output file larger than my original?
If you upload a compressed format like MP3 or M4A, the output WAV file will be larger because WAV is an uncompressed, lossless format. This ensures no additional quality loss from re-compression. You can convert the WAV back to MP3 using other tools if needed.
Is this tool really free?
Yes, completely free with no hidden costs, no premium tiers, and no registration required. There are also no file size limits beyond what your browser can handle. Process as many files as you want, as often as you need.
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