Remove background noise from video
Clean up the sound of a video and keep the picture exactly as it was, on your own device.
- Nothing is uploaded
- Works offline after first use
- Open source
- No watermark · limit is your device’s memory; phones hold less
Clean wind, traffic, fan and crowd noise out of the sound of an MP4, MOV or WebM video in your browser. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after your first run to save itself for offline use, and then it works offline.
Done
Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
A talking-head video filmed outdoors, a screen recording with a loud fan, a phone clip at a busy event: the picture is fine, but the sound is buried in noise. This page takes the sound track out of the video, runs it through RNNoise, a neural network trained to keep speech, and puts the cleaned sound back with the original picture. The picture is copied as it is, so it looks exactly the same and a long video is processed quickly.
The cleaned sound stays in sync with the lips, because the network’s 10 ms delay is taken out before the sound goes back in. MP4 and MOV come back as MP4 with AAC sound, and WebM stays WebM with Opus sound. Light wind and traffic are reduced well; strong wind that hits the microphone directly and clips it cannot be fully repaired.
How it works
- Drop one or more videos.
- Keep Strong, or pick Medium or Light to keep some of the scene.
- Press Remove noise and save the cleaned videos.
In your browser, not on a server
Your browser decodes the sound with its own audio decoders. RNNoise (BSD-3-Clause, from Xiph.Org and Mozilla), a small recurrent neural network compiled to WebAssembly, then reads it 10 ms at a time at 48 kHz, estimates how much of each frequency band is voice, and turns the rest down. The file is written again in your tab: MP3 by LAME in WebAssembly, WAV and FLAC by code in this site, M4A and OGG by the browser’s own encoders. For a video, Mediabunny (MPL-2.0) copies the picture packets unchanged and adds the cleaned sound.
Compared with upload-based tools: Online noise removers upload your recording to their servers, cap free use at a few minutes, and often ask for an account before you can download. Interviews, voice notes and meetings are private. Here the network runs on your device and the sound never leaves it.
Verify it yourself. Give the page a short while after your first run to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Will it remove music playing in the background of my video?
Mostly, because the network keeps speech and treats other sound as noise. That also means it will thin out music you want to keep, so it is the wrong tool for a music video or a clip with a soundtrack.
Can it fix wind noise from a phone or action camera?
It reduces the steady rumble of light wind well. Gusts that blow straight into the microphone overload it and distort the recording itself, and no noise remover can rebuild the voice under that distortion. A foam or furry cover on the microphone is the fix next time.
Does the video lose quality?
The picture does not: its packets are copied into the new file unchanged. Only the sound is re-encoded, at a bitrate that sounds the same as the original for speech.
Can I clean an iPhone video that my browser will not play?
Yes. The page only needs to read the sound track, which is AAC in almost every phone video, and copies the HEVC picture without decoding it. The cleaned video plays wherever the original did.
Is the file uploaded anywhere?
No. There is no server in this process. The page is a static file and the work is done by code running inside your browser tab. Give the page a short while after your first run to save itself for offline use; then you can turn off Wi-Fi and it still works.
More video and audio tools
Remove background noise
Keep the voice, lose the hiss, hum and fan noise. Cleaned on this device, never uploaded.
Audio splitter
Cut one long recording into separate files at the times you choose or at equal lengths. Done on this device, and the file is not uploaded.
Video to MP3
Pull the sound out of a video, or turn any audio file into an MP3. Your files are converted on this device and never uploaded.
Video to GIF
Trim a clip, pick a size and frame rate, and get a looping GIF. The video is decoded by your browser and never leaves this device.