# Audio Noise Reduction

Reduce background noise

> Canonical page: https://elysiatools.com/en/tools/audio-noise-reduction

- **Category:** Media

- **Keywords:** audio, noise reduction, denoise, afftdn, anlmdn

## Overview

Applies ffmpeg frequency-domain denoise (afftdn) or non-local means (anlmdn) to reduce background noise.

## Inputs

- **Audio File** (file): Select an audio file
- **Mode** (select)
- **Noise Floor (dB)** (number)
- **Band (afftdn)** (select)
- **Strength (anlmdn)** (number)
- **Output Format** (select)

## When to use

- When audio recordings contain unwanted background noise such as hums, hisses, or ambient sounds.
- To improve clarity in podcasts, interviews, or voiceovers before publishing or sharing.
- When preparing audio for professional applications like video production or music mixing where clean sound is essential.

## How it works

- Upload an audio file in a supported format, such as MP3 or WAV.
- Select a denoising mode: afftdn for frequency-domain noise reduction or anlmdn for non-local means denoising.
- Adjust optional parameters like noise floor (in dB), band selection for afftdn, or strength for anlmdn to fine-tune the effect.
- Choose an output format and download the processed audio file.

## Use cases

- Cleaning up interview recordings to remove background chatter or ambient noise.
- Reducing wind or traffic noise in outdoor audio captures for clearer playback.
- Enhancing audio quality for online meetings, webinars, or educational content.

## Frequently asked questions

### What audio file formats can I upload?

You can upload audio files in common formats like MP3, WAV, AAC, and others, with a size limit of 200 MB.

### What is the difference between afftdn and anlmdn modes?

afftdn uses frequency-domain denoising for broadband noise, while anlmdn applies non-local means for more targeted noise reduction.

### How do I control the noise reduction level?

For afftdn, adjust the noise floor in dB; for anlmdn, set the strength parameter to control intensity.

### Can I choose the output audio format?

Yes, you can select from formats including MP3, AAC, M4A, OGG, Opus, FLAC, and WAV.

### Is there a limit on file size or processing time?

Files must be under 200 MB, and processing time varies based on file size and options, but it typically completes quickly.

## Related tools

- [Audio Denoise Chain](https://elysiatools.com/en/tools/audio-denoise-chain): Apply a multi-step denoise chain with filters and optional RNNoise
- [Audio Wind Noise Reducer](https://elysiatools.com/en/tools/audio-wind-noise-reducer): Reduce low-frequency wind rumble and broadband gust noise in recordings.
- [FFmpeg Audio Noise Reduction](https://elysiatools.com/en/tools/ffmpeg-audio-noise-reduction): Professional audio noise reduction using FFmpeg advanced filters (highpass, afftdn, loudnorm) for optimal audio cleaning
- [Spectral Denoiser](https://elysiatools.com/en/tools/spectral-denoiser): Reduce broadband noise with a spectral filter chain
- [Assistive Listening Enhancer](https://elysiatools.com/en/tools/audio-assistive-listening-enhancer): Clarify listening audio with low-frequency cleanup, speech-presence EQ, conservative denoising, and level protection.
- [Audio Dither](https://elysiatools.com/en/tools/audio-dither): Apply dithering during bit depth reduction
- [Audio Remote Guest Rescue](https://elysiatools.com/en/tools/audio-remote-guest-rescue): Reduce room echo, broadband noise, boxiness, and dullness in remote guest recordings.
- [Bleed Reduction](https://elysiatools.com/en/tools/bleed-reduction): Reduce bleed between multiple audio stems and package the results

## Samples

- [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
- [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free Raw PCM Audio Samples](https://elysiatools.com/en/samples/pcm-samples): Raw PCM s16le audio samples featuring nature ambience and relaxing music for waveform, playback, and conversion workflows

## Related content

- [Audio Restoration, Noise Repair, and Cleanup Tools](https://elysiatools.com/en/hubs/audio-restoration-repair-workflows): Diagnose and repair clicks, hum, clipping, crackle, room sound, hiss, and harshness without promising lossless restoration.