Open a video and its soundtrack is cleaned automatically: steady background noise such as hiss, fans, air conditioning, traffic rumble and electrical hum is reduced while voices stay clear. Compare the cleaned, original and removed sound in sync with the picture, then save the video with the picture copied untouched. Nothing is uploaded.
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Original Cleaned
LightStrong
Analyzing the soundtrack…
The picture is copied untouched and only the soundtrack is replaced (uses an in-browser ffmpeg, about 31 MB, downloaded once).
Your cleaned video
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How to use the Remove Background Noise from Video
Choose a video by dropping it on the box or clicking to browse. The soundtrack is read and cleaned straight away.
Play the preview and switch between Cleaned, Original and Removed noise. Removed noise should contain hiss and hum, not words.
Adjust the strength: raise it for noisy rooms, lower it if the voice sounds watery. Pick 60 Hz or 50 Hz hum removal if you hear a low buzz.
Press Save cleaned video. The picture is copied as it is and the clean audio is added; the first time, the ffmpeg engine (about 31 MB) is downloaded.
Download video, or use Download audio (WAV) if you only need the cleaned sound.
Which settings to use
Problem you hear
Settings
Why
Soft hiss from a camera or phone microphone
Light hiss (30 %), smoothing Medium
Hiss is far below the voice; a gentle gate removes it without artifacts
Laptop fan, air conditioning, room tone
Normal (55 %)
Steady broadband noise is what the learned profile captures best
Low buzz under the voice
Hum filter 60 Hz (or 50 Hz) plus Normal
Notch filters remove the mains frequency and its harmonics
Wind rumble, traffic, handling thumps
Cut rumble below 80 Hz on, Normal to Noisy room
Most rumble energy sits below the lowest speech frequencies
Loud constant noise, e.g. a busy street or machine
Noisy room (80 %), smoothing High
Stronger subtraction, smoothing keeps the voice from warbling
How the cleaned video is saved
A video file is a container holding separate streams. This tool keeps the original video stream byte for byte and only replaces the audio stream, the same as running ffmpeg -i video -i clean.wav -map 0:v -map 1:a -c:v copy. The output keeps the original container where possible:
MP4, M4V, MOV, MKV: new audio as AAC at 192 kbps.
WebM: new audio as Opus at 160 kbps.
Subtitle and extra audio tracks are not carried over; only the first video track and the cleaned soundtrack are saved.
Tips for cleaner sound
Leave two or three seconds of silence at the start of a recording: it gives the tool a clean sample of the room noise.
Noise reduction can't restore speech that is quieter than the noise. Move the microphone closer to the speaker when you can.
Listen to Removed noise: if you can understand words in it, lower the strength.
Clean first, then boost: raising the volume before removing noise makes the hiss louder too. Use a volume booster afterwards if the video is quiet.
Frequently asked questions
How does it remove background noise from a video?
The soundtrack is decoded and split into overlapping 43 ms frames that are converted to frequencies with an FFT. The quietest 10 % of frames are taken as a sample of the background noise. In every frame, frequencies that are not clearly louder than that noise are turned down (a spectral gate with Wiener-style gains), with smoothing across time and frequency to avoid warbling. The frames are converted back to sound and overlapped again.
Is the video re-encoded?
No, not normally. The cleaned soundtrack is encoded (AAC for MP4, MOV and MKV, Opus for WebM) and combined with the original video stream using ffmpeg running in your browser with stream copy, so picture quality, resolution and frame rate stay exactly the same. Only if ffmpeg can't be downloaded does the tool fall back to re-recording the video in real time.
What kinds of noise can it remove?
Steady, constant noise works best: microphone and camera hiss, fans, computer and air-conditioning noise, fridge hum, distant traffic and wind rumble. Electrical hum is handled by the 50/60 Hz filter. Changing sounds such as music, other voices, dog barks, keyboard clicks or a passing car can't be separated from speech by a noise gate.
Should I choose 50 Hz or 60 Hz hum removal?
Mains electricity runs at 60 Hz in North America, much of South America, Taiwan, South Korea and parts of Japan, and at 50 Hz in Europe, Africa, most of Asia and Australia. Hum from lights and power supplies sits at that frequency and its multiples. If you aren't sure, try both and listen to the Removed noise preview.
Why does the voice sound watery or robotic?
Those 'musical noise' artifacts appear when too much is removed. Lower the strength, raise smoothing, or switch to the Light hiss preset. A little remaining background noise usually sounds more natural than none, and it is masked when there is music under the speech.
Is there a size or length limit?
Everything runs in your browser's memory, so very large files can fail. Videos up to roughly an hour and 700 MB can be cleaned on a typical computer; ffmpeg can write files up to about 2 GB. For longer recordings, split the video first.
Is my video uploaded?
No. Decoding, noise reduction and saving all happen on your device. The only download is the open-source ffmpeg engine itself; your video never leaves your computer or phone.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.