---
title: "Remove background noise from audio free · Cutshed"
description: "Turn down steady hiss, fan, and room tone on a voice in the browser. RNNoise writes a WAV. Music and a door slam are a poor fit. Nothing is uploaded."
canonical: "https://cutshed.com/blog/how-to-remove-background-noise-from-audio/"
---

# Remove background noise from audio free · Cutshed

Turn down steady hiss, fan, and room tone on a voice in the browser. RNNoise writes a WAV. Music and a door slam are a poor fit. Nothing is uploaded.

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# How to remove background noise from audio for free
Published November 9, 2026 .
Open Noise remover, drop a WAV, MP3, M4A, FLAC, or OGG of speech, and click Reduce noise. The page runs RNNoise on this device, then plays a 16-bit WAV. It is for steady hiss, fan noise, and room tone. It is a poor fit for music, and it does not remove a door slam, a cough, or a siren. The file is not uploaded. The limit is 15 minutes or 80 MB. A video is not in the file picker. Extract an MP3 first, then re-attach the voice in an editor.
The tool for this is Noise remover . It is a speech denoiser, not a general cleanup. Steady noise under a voice is the job. A song, a guitar, or a room full of music is not. Use your own recordings, or recordings you have the rights to.
The first run loads an RNNoise WebAssembly module of about 110 KB from this site. That file is the denoiser. The recording stays in the tab. Closing the tab drops the result.
## Steps
- Drop a voice recording Open Noise remover and drop a WAV, MP3, M4A, FLAC, or OGG. The hint on the page says speech with hiss or a steady room tone, and that songs are a poor fit. The file picker does not list video. The limit is 15 minutes or 80 MB.
- Click Reduce noise The button reads Reduce noise, then Cleaning while it runs. The page decodes the file in the browser, resamples each channel to 48 kHz, and runs RNNoise in frames of 480 samples. The cleaned audio is resampled back to the file's own rate and saved as 16-bit WAV. The first run loads the wasm module, about 110 KB. Later runs in the same tab reuse it.
- Listen to the WAV When it finishes, the status line says Denoised and the length, and the WAV plays in the player under the button. This page does not add a separate Download button. The WAV is that player in the tab. Leave the tab open until you have saved it, if your browser offers a save on the player.
- For a video, extract the voice first Noise remover will not offer a video in the picker. Open Video to MP3 , drop an MP4, MOV, WebM, or MKV, and download an MP3 at 128, 192, 256, or 320 kbps. 192 kbps is the default. Files over 250 MB are refused there. Then drop that MP3 on Noise remover. The picture stays in the original video. The walkthrough is how to extract audio from a video .
- Put the voice back in an editor The noise page does not write the cleaned voice back onto the picture. Re-attach it in an editor. Editor can import the original video and an audio file, mute the video clip's own sound, and export an MP4 or a WebM. You need the cleaned WAV as a file to import. If you edit somewhere else, re-attach it there.
## What the noise page will and will not take
## Steady noise on speech
RNNoise is the built-in model from the xiph.org project, compiled to WebAssembly by the Jitsi rnnoise-wasm package. No other weights are fetched. It was trained on speech. Use it on interviews, voiceovers, and calls. A laptop fan is the case the page names.
It does not remove a door slam, a cough, or a siren that happens once. Those are not stationary noise. Edit them out. If the voice turns robotic, the noise was already louder than the speech. Record closer next time. The page does not publish a before-and-after measurement.
## A video's voice track
The noise page decodes audio. The picker is audio/*, plus .wav, .mp3, .m4a, .flac, and .ogg. Dropping a video is not the supported path. Video to MP3 discards the picture and encodes the track that is already in the file with LAME. It does not denoise. Speech is fine at 128 kbps. The menu opens on 192 kbps. The guide is how to extract audio from a video .
Denoise the MP3, then re-attach the voice. Editor imports video, stills, or audio. A video keeps its own sound, and the clip has mute. Export is H.264 and AAC in an MP4 at 720p or 1080p, or WebM with VP8 and Opus. The noise page has no control that muxes the WAV back onto the video.
## Volume, music, and captions
The noise page says to denoise before you boost, or to boost only a little first. A huge gain lifts the noise floor into the model's working range and the voice gets chewed. The Volume page says the other half of that: peak-normalize a quiet interview before the noise remover, because RNNoise behaves better when the voice is not a whisper in the noise floor. Volume can peak-normalize to about −1 dB, or add +6 dB or +12 dB, and it also writes a WAV. Do not stack +12 dB twice.
If the take is a song, leave it alone, or split the vocal first. Vocal remover writes a vocals WAV and an instrumental WAV. Denoise only the vocal stem if you must. The vocal page takes up to 8 minutes. Music is not the RNNoise training set, and the noise page says to expect damage on a song.
Caption the cleaned voice with how to add subtitles to a video . That page writes an SRT or a VTT. It does not burn the words into the picture. This noise page cleans a recording you already have. To make AI music, text to speech, or a sound effect and download MP3 or WAV, open the AI audio maker . That job spends Studio credits. It does not denoise a file you already recorded.
## Do this part in Cutshed
- Noise remover RNNoise on speech. Steady hiss, fan, and room tone. 15 minutes or 80 MB. The result is a 16-bit WAV in the player. Nothing is uploaded.
- Video to MP3 Extracts an MP3 at 128, 192, 256, or 320 kbps when the source is a video. The picture is discarded. Files over 250 MB are refused. It does not denoise.
- Volume Peak-normalizes to about −1 dB, or boosts +6 dB or +12 dB, and writes a WAV. Denoise before a large boost.
- Vocal remover Splits a song into a vocals WAV and an instrumental WAV. Denoise the vocal stem only if you must. Up to 8 minutes.
- Editor Imports the original video and an audio file, mutes the clip's own sound, and exports MP4 or WebM. The noise page does not mux the WAV back itself.
- AI audio maker Makes new music, speech, or a sound effect and spends Studio credits. It does not clean a recording you already have.
## FAQ
- How do I remove background noise from audio for free?
Open Noise remover, drop a WAV, MP3, M4A, FLAC, or OGG, and click Reduce noise. RNNoise runs in the browser and plays a 16-bit WAV. Nothing is uploaded. The limit is 15 minutes or 80 MB.
- How do I remove background noise from a voice recording?
Use a take where the noise is steady, such as a fan, hiss, or room tone under speech. The page resamples each channel to 48 kHz and processes 480-sample frames. A door slam, a cough, or a siren stays in the file.
- How do I remove hiss from audio online?
Steady hiss on a voice is the case this page is for. The wasm module is about 110 KB and loads on the first run. The recording is not posted to a server. The result plays as WAV in the tab.
- Can I clean a video's voice track here?
Not directly. The file picker does not list video. Extract an MP3 with Video to MP3, denoise that MP3, then re-attach the voice in an editor. Cutshed's editor can import the video and an audio file and export MP4 or WebM. The noise page does not write a new video.
- Will this clean a podcast that has music under the voice?
Expect damage if you denoise the whole mix. Music is not the training set. Split the vocal first with Vocal remover, then denoise only that stem if you must. Leave a music bed alone.
- Does the audio leave the browser?
No. The wasm file is the only download, and it is the denoiser, not your recording. The cleaned WAV stays in the tab.
Files stay on this device.
Free tools never upload the file you open. Studio is the only paid part of the site, and the only place a prompt is sent to a video model.

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