Free Online Noise Reduction
Professional audio denoising
Remove unwanted background noise, hiss, hum, and static from your audio recordings using advanced FFT-based algorithms. Choose from optimized presets or fine-tune parameters manually. All processing happens locally in your browser for complete privacy.
Upload Audio Files
Drag and drop your audio files here, or click to browse
Supports: Supports MP3, WAV, FLAC, AAC, M4A, OGG, and more
How It Works
Simple, secure, and professional noise reduction
Upload Audio Files
Drag and drop your noisy audio files or click to select them from your device.
Choose Noise Reduction Settings
Select a preset (Light, Moderate, Heavy, Voice, Music) or customize reduction amount and noise floor.
Process Audio
Our FFmpeg-powered engine applies advanced noise reduction algorithms directly in your browser.
Download Clean Audio
Download your professionally cleaned audio files with background noise removed.
Why Choose Our Noise Reduction Tool?
Experience professional-grade audio denoising with cutting-edge browser technology
100% Private & Secure
All processing happens locally in your browser. No files are uploaded to our servers.
Advanced FFT Algorithm
Uses FFmpeg's afftdn (FFT Denoiser) for high-quality noise reduction with minimal artifacts.
Multiple Presets
Choose from 5 optimized presets: Light, Moderate, Heavy, Voice (speech), and Music.
Adaptive Noise Tracking
Automatically adapts to changing noise levels throughout your recording for consistent results.
Adjustable Parameters
Fine-tune noise reduction amount (0.01-30 dB) and noise floor (-80 to -20 dB) for perfect results.
Batch Processing
Process multiple audio files at once with the same settings for efficient workflow.
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Frequently Asked Questions
What is noise reduction and how does it work?
Noise reduction is the process of removing unwanted background sounds (like hiss, hum, static, fan noise, or room tone) from audio recordings. Our tool uses FFmpeg's afftdn (FFT Denoiser) algorithm, which analyzes the frequency spectrum of your audio to identify and remove noise patterns while preserving the desired signal. The algorithm continuously tracks the noise profile and adapts to changes throughout the recording.
What types of noise can this tool remove?
This tool effectively removes: continuous background noise (white noise, pink noise), electrical hum (50Hz/60Hz), hiss from tape recordings or preamps, fan noise and air conditioning sounds, room tone and ambient noise, computer fan noise, and low-level static. It works best on constant noise patterns. For impulsive noise like clicks and pops, consider using a de-clicker tool instead.
Which preset should I use?
Light (6 dB): Gentle noise reduction for high-quality recordings with minor background noise. Moderate (12 dB): Balanced option for most use cases, good starting point. Heavy (20 dB): Aggressive reduction for very noisy recordings, may affect audio quality. Voice: Optimized for speech and podcasts, preserves vocal clarity. Music: Gentle reduction that preserves musical detail and dynamics. Start with Moderate and adjust based on results.
What is noise reduction amount?
Noise reduction amount (measured in dB) controls how aggressively the algorithm removes noise. Higher values (15-30 dB) remove more noise but may introduce artifacts or make the audio sound processed. Lower values (3-10 dB) are more subtle and natural-sounding. Start with 12 dB (Moderate preset) and increase if needed. If you hear artifacts or the audio sounds muffled, reduce the amount.
What is noise floor and how do I set it?
Noise floor is the threshold (in dB) below which audio is considered noise rather than signal. Lower values (-60 to -80 dB) are more sensitive and preserve quieter sounds but may leave some noise. Higher values (-30 to -50 dB) are more aggressive and remove more noise but may cut into quiet parts of your signal. For clean recordings, use -55 to -50 dB. For very noisy recordings, use -45 to -40 dB. Listen to the results and adjust accordingly.
What is adaptive noise tracking?
Adaptive noise tracking allows the algorithm to continuously analyze and adjust to changing noise patterns throughout your recording. This is useful when: recording environment changes (someone closes a door, AC turns on/off), noise levels vary across the recording, or there are multiple types of noise present. Enable this for real-world recordings. Disable it if the noise profile is very consistent throughout.
What's the difference between afftdn and anlmdn algorithms?
afftdn (FFT Denoiser): Uses Fast Fourier Transform analysis. Best for most use cases. High quality with good detail preservation. The default and recommended option. anlmdn (Non-Local Means Denoiser): Alternative algorithm using spatial filtering. May preserve more fine detail in some cases. Can be slower to process. Experiment with both if afftdn doesn't give desired results.
Why does my audio sound muffled after noise reduction?
If your audio sounds muffled or dull: 1) Reduce the noise reduction amount (try 6-10 dB instead of 20+ dB). 2) Lower the noise floor threshold (try -55 dB instead of -40 dB). 3) Switch to a lighter preset (try Light or Music instead of Heavy). 4) Disable track residual if enabled. Some noise removal always affects audio quality - find the balance between clean audio and natural sound.
Can I use this for real-time noise reduction?
No, this tool processes pre-recorded audio files, not live audio streams. For real-time noise reduction during recording or video calls, you'll need specialized software or hardware with real-time processing capabilities. This tool is designed for post-processing recorded audio files.
What audio formats are supported?
Input formats: MP3, WAV, FLAC, AAC, M4A, OGG, WMA, AIFF, and most common audio formats. Output formats: MP3, WAV, FLAC, AAC, OGG, M4A. For best quality, we recommend using lossless formats (WAV or FLAC) as input when possible, especially when applying heavy noise reduction.
Will noise reduction affect audio quality?
Yes, all noise reduction introduces some trade-offs. Aggressive noise reduction (20+ dB) may introduce: slight reduction in high-frequency detail, subtle artifacts in very quiet passages, minor reduction in dynamic range, or slight 'processed' sound quality. To minimize quality loss: use the minimum amount needed, start with Light or Moderate presets, and preserve the original file for comparison. Quality loss is usually minimal with proper settings.
Is this tool really free and private?
Yes, completely free with no hidden costs, subscriptions, or usage limits. All processing happens locally in your browser using WebAssembly (FFmpeg.wasm). Your audio files never leave your device and are not uploaded to any server. No account, registration, or personal information is required. Your data and privacy are completely protected.