Remove background noise, hiss, and hum from audio recordings using FFmpeg afftdn filter, improving clarity for podcasts, interviews, and voice recordings
Our free background noise remover cleans up an audio recording by reducing the steady hiss, hum, and drone sitting underneath your voice, so speech comes through clearer. Upload an MP3, WAV, or FLAC audio file, run the noise reduction, and download a tidied MP3. It runs on the professional FFmpeg engine using its afftdn noise reducer, the adaptive filter that measures constant background sound and pulls it down while leaving your voice in place. Whether you want to remove noise from audio online free, quiet a noisy fan behind an interview, or take the hiss off a voice memo, this tool helps your recording sound cleaner. It is free to use with no watermark on your file.
Reducing noise in an audio file with File Tools Online takes a few quick steps, and you do not need Audacity, Adobe Audition, or any desktop software. Everything runs online in your browser once you have created your free account.
Drag and drop your recording into the box above, or click to browse and pick the file from your device. MP3, WAV, and FLAC audio files are accepted.
Start the process and the afftdn filter analyses the constant background noise in your recording and lowers it, keeping the voice and other wanted sound in front.
Download the finished MP3 and use it anywhere. Your file is processed securely and deleted automatically within 30 minutes.
The result is a recording where steady background noise is quieter and the voice is easier to hear. This is a reduction, not a magic eraser, so it works best on constant, even noise such as hiss or a background fan rather than on sudden, one-off sounds like a door slamming.
Plenty of "clean up audio" sites bury you in ads, add a watermark, or hand back a hollow, robotic-sounding file. Ours uses FFmpeg, the same professional engine trusted inside major media software, with the afftdn noise reducer to lower steady background noise while trying to keep your voice natural.
The afftdn filter is built for constant background sound: hiss, electrical hum, and the low drone of fans, air conditioners, and computers.
Powered by FFmpeg, the professional-grade tool behind countless audio and video apps, so your noise reduction is consistent and reliable.
By pulling down the noise floor, podcasts, interviews, and voice recordings sound cleaner and speech is easier to follow.
Reduce audio noise free online with no watermark added and no audible stamp placed over your recording.
Files are processed securely over an encrypted connection and automatically deleted within 30 minutes of upload.
Runs online on Windows, Mac, Linux, Chromebook, Android, and iPhone. Nothing to download and nothing to install.
Almost every recording has a noise floor, the quiet layer of sound that is always there even when nobody is talking. It might be tape or microphone hiss, a 50 or 60 hertz electrical hum, or the steady drone of a fan, an air conditioner, or a computer in the room. Because that noise stays fairly constant, a computer can learn what it looks like across the frequency spectrum and subtract it. That is exactly what FFmpeg's afftdn filter (Adaptive Fourier Transform De-Noiser) does when you use this tool.
The filter breaks your audio into frequency bands, estimates how much steady noise sits in each one, and reduces those bands while trying to leave the voice untouched. This is a noise reduction tool, not a separation tool: it lowers the whole steady background layer at once. It does not, and cannot, pick out one instrument, mute a single person, or isolate one voice from a crowd. It also cannot promise perfect or total silence. Push any noise reducer too hard and the voice starts to sound thin or watery, so the goal here is a cleaner, more listenable recording rather than a flawless one.
This audio noise reducer is at its best on the constant, low-level sounds that sit behind speech. Here are the situations people reach for it most often.
File Tools Online offers more than 100 free tools to convert, edit, and manage your files. These are the ones people use most alongside the audio noise reducer.
When a recording has too much background noise, you have two choices: fix the audio you already have, or capture it again. Re-recording gives the best result, but it is not always possible. This tool is the quickest way to rescue audio you cannot simply record a second time.
| Situation | Audio Denoise (this tool) | Re-recording |
|---|---|---|
| Interview already finished | Reduce the steady background noise afterward | Not possible, the moment has passed |
| Constant hiss or hum | Well suited, the filter is built for even noise | Needs a quieter room and better gear |
| One-off bang or cough | Not designed for sudden sounds | Retake the line cleanly |
| Time and effort | Upload, process, download | Reset the setup and record again |
| Cost | Free, no watermark | Free but time-consuming |
For steady, unwanted background noise on a recording you cannot redo, a quick pass through the noise reducer is usually the practical answer.
Desktop editors like Audacity and Adobe Audition have well-known noise reduction features, but they mean installing software and manually selecting a "noise profile" before you can start. If you only need to reduce noise on one recording, that is a lot of setup.
This online tool is a simpler, free alternative for that common job. It runs the FFmpeg afftdn filter on our servers, so you get noise reduction without downloading anything, without a paid license, and without a manual noise-profile step. For heavy studio restoration you may still want a full editor, but for a quick clean up audio pass this handles the everyday case in a few clicks.
This is an audio noise reducer, so it works on audio files, not video. Upload one of the supported audio formats and the tool returns a cleaned MP3.
Whichever of these you upload, the output is a standard MP3 with the steady background noise reduced, ready to play, share, or upload anywhere. If your file is a video rather than audio, see the next section for how to get the sound out first.
This tool does not accept video files directly, so a clip like an MP4, MOV, or MKV cannot be uploaded here as-is. If your noisy audio is inside a video, the fix is to separate the audio first, clean it, and then use it however you need. There are two paths depending on what you want to end up with.
Keeping audio and video as separate steps like this is normal in editing, and it means each tool can do its own job well while you keep full control over what happens to the video.
Because this is an online noise reducer, it works the same on every device. There is no program to install on Windows, no app to download on Mac, and nothing to add to your phone. You use the exact same page whether you are on a laptop, a Chromebook, an Android device, or an iPhone.
That makes it easy to remove background noise on a Mac, on a work computer where you cannot install software, or on your phone before you post a clip. The processing runs on our servers with FFmpeg, so even a longer recording is handled reliably. All you need is a browser and an internet connection, and you can clean up a recording from anywhere.
Yes. The recordings people clean up are often interviews and private voice notes they have not published yet, so security is built in. Files are uploaded over an encrypted HTTPS connection, processed on a secure server, and automatically deleted within 30 minutes. We never share, sell, or reuse your audio.
Upload your MP3, WAV, or FLAC recording to the tool above and start the process. The FFmpeg afftdn filter measures the steady background noise and lowers it, then lets you download a cleaned MP3. Everything runs online in your browser once you have signed in.
Yes, the tool is free to use through a free account, and no watermark is added to your file. You upload the audio, reduce the noise, and download the cleaned MP3.
You can upload MP3, WAV, and FLAC audio files. Whichever format you choose, the tool returns a standard MP3 with the steady background noise reduced.
No, this tool works on audio files only. If your sound is inside a video, first get the audio out with Video to MP3 or Extract Audio, then run that audio file through this noise reducer. To drop a video's sound entirely, use Video Mute instead.
It is designed for steady, constant background noise such as hiss, electrical hum, and the drone of fans, air conditioners, and computers, along with even room ambience. It is not built for sudden one-off sounds like a door slamming or a single cough.
No noise reducer can promise perfect or total removal. The afftdn filter lowers the steady noise a long way while trying to keep the voice natural. Pushed too far, any denoiser makes speech sound thin, so the aim is a cleaner, more listenable recording rather than absolute silence.
No. This is a noise reduction tool, not a separation tool. It lowers the whole steady background layer at once and cannot pick out one person's voice, mute a single speaker, or remove one instrument from a mix.
Yes, constant hiss and electrical hum are exactly the kind of even, steady noise the afftdn filter handles best. Upload the recording, run the reduction, and download a cleaner MP3.
Some change is normal, because the filter is subtracting sound from the recording. Done at a sensible level it mainly lowers the background and keeps speech clear. Very aggressive noise removal can make a voice sound thin or watery, which is why moderate reduction usually sounds best.
No. This is a free online alternative to desktop noise reduction. It runs the FFmpeg afftdn filter on our servers, so you get the result without installing software, buying a license, or setting a manual noise profile.
The output is an MP3 with the steady background noise reduced. If you need a smaller file afterward, you can run it through Audio Compress.
Yes. Files are transferred over an encrypted connection, processed securely, and automatically deleted within 30 minutes. We never share or sell your recordings.
Almost no recording is captured in perfect silence. A microphone picks up its own hiss, mains power adds a faint hum, and the room contributes the steady drone of fans, air conditioning, and computers. That constant layer of sound is the noise floor, and it is what makes an otherwise good interview, podcast, or voice recording feel muddy and hard to listen to. Reducing it is one of the most common things people need to do to a spoken-word recording.
A good noise reducer does not just turn the volume down, it identifies the steady noise across the frequency spectrum and lowers it while leaving the voice in front. This free online tool does exactly that using FFmpeg's afftdn filter: it takes an MP3, WAV, or FLAC recording, reduces the constant background hiss, hum, and drone, and returns a cleaned MP3 with no watermark. Upload your audio, reduce the noise, and download a recording that is easier to hear, share, and understand.