Background noise is the fastest way to make good footage feel amateur. Hiss, hum, fan rumble, and room tone bury the voice and pull attention from what is being said. With Supercut you clean up the audio by typing a plain-English prompt, and the whole process runs in your browser, so your recording is never uploaded.
Most unwanted sound falls into two buckets. The first is steady, broadband noise: tape hiss, electrical hum, air conditioning, computer fans, and general room tone. This kind sits under everything at a constant level, and it is the easiest to reduce because software can learn its profile and pull it down. The second bucket is sudden, irregular sound: a door slam, a cough, traffic, a notification ping. Steady noise responds well to cleanup. Irregular noise is harder, and the most reliable fix for a one-off sound is to trim that moment out instead of trying to erase it.
Supercut is a prompt-based editor. You describe the edit in plain English, an AI plans it, and a deterministic engine maps that plan to FFmpeg operations that run locally through WebAssembly. For noise, that means the cleanup happens on your own device. Your video and its audio files are never sent to a server. The AI that plans the edit gets your request, the words said in your clip and its sound levels (both worked out on your device), and a few low-resolution frames only if you turn that on. The result is clearer speech with the constant background layer pulled down, exported as a normal video file.
Cleanup goes further when you stack a few prompts in order. After reducing noise, ask Supercut to normalize the volume so the voice lands at a steady level once the background layer drops. If dead air at the start or end is where the hiss is most obvious, trim those seconds out. And if a single loud event ruins one stretch, cutting that slice is more dependable than fighting the sound itself. Clean, then normalize, then trim, all from plain-English prompts in a row.
Go to Supercut in your browser and add the video with the noisy audio. It loads locally on your device. Your video is never uploaded.
Ask for the cleanup in your own words, for example "clean up the audio and reduce background noise." The AI plans the edit and the engine applies it on your device.
Play it back and listen for clearer speech with the hiss or hum pulled down underneath it. Want more? Follow up with another prompt like "normalize the volume" or "trim the first three seconds."
When it sounds right, export. The cleaned video is rendered locally and saved to your device, with your footage and audio never having left your browser.
Clean up muddy audio and reduce background noise in a video, in your browser. No upload, your footage and audio stay on your device.
Make a quiet video louder or tame loud audio in your browser. Adjust volume in dB without uploading your clip.
Mute a video or strip its soundtrack in your browser. Remove audio without uploading, perfect before adding your own music or voiceover.
No. Audio cleanup runs in your browser through WebAssembly, so your video and its audio files stay on your device. The AI that plans the edit gets your request, the words said in your clip and its sound levels (both worked out on your device), and a few low-resolution frames only if you turn that on.
Steady, constant noise is the best candidate: hiss, electrical hum, air conditioning, fan noise, and general room tone. Sudden one-off sounds are harder, and trimming that moment out is usually the better fix.
Heavy noise reduction can thin out a voice, so Supercut aims for a clearer result without overprocessing. If the voice ends up uneven, follow up with a "normalize the volume" prompt to even it out.
No install, it runs in your browser. Editing is free, and so is your first export, with no account and no watermark. Unlimited exports come with a paid plan, from 4.99 a month billed yearly, 9.99 monthly, or 79 one-time lifetime.
Yes. If the audio is beyond saving, you can ask Supercut to mute or remove the audio, or replace the track with new audio, all from plain-English prompts.