Background Hum Remover for Audio & Video
A low electrical hum buzzing under your recording? StemSplit's AI removes 50/60 Hz mains hum, ground-loop buzz, and HVAC rumble while keeping your voice clear — no plugins, filters, or re-recording.
Start free: Get 5 minutes free when you sign up — your track starts processing immediately!
How do you remove background hum from a recording?
To remove background hum from a recording, upload your audio or video to an AI hum remover, let it cut the steady low-frequency drone and its harmonics, and download the clean file. AI tools work in the browser in one click; in editing software you can apply a notch or hum-removal filter at 50 Hz or 60 Hz. Most background hum is mains hum from electrical power, ground loops, or nearby gear, so a steady hum cleans up very well — while loud buzz layered with crackle can be reduced but may not be fully recovered.
How to remove background hum with StemSplit
Three steps, no audio-editing experience needed:
- 1Upload your fileDrag in any audio or video file: interviews, podcasts, music takes, voiceovers, or screen recordings with a steady electrical hum underneath.
- 2Let AI remove the humStemSplit detects the steady mains hum and its harmonics and reduces them while keeping the natural tone of the voice.
- 3Download clean audioCompare before and after and download your hum-free file. No plugins, filters, or re-recording.
Depending on your gear, there are four common ways to fix background hum:
1. AI hum remover (fastest)
Browser tools like StemSplit isolate the voice and strip the electrical hum automatically — ideal for quick, clean results with no editing skills.
2. Notch / hum filter in editing software
In Adobe Premiere Pro or Audition, apply the DeHummer or a notch filter set to 50 Hz or 60 Hz plus harmonics; in DaVinci Resolve or Final Cut Pro, enable Voice Isolation and raise the strength until the hum is gone.
3. Noise reduction in a DAW
In Audacity or Pro Tools, sample a silent section that contains only the hum and apply noise reduction, or notch out 50/60 Hz and its multiples with an EQ — a solid fix when no AI tool is on hand.
4. Fix it at the source
If you can re-record, track down the ground loop and use balanced cables (see the tips below): preventing hum is always easier than removing it.
What causes background hum?
Background hum is a steady low-frequency tone — usually 50 Hz or 60 Hz mains hum — that leaks into a recording from electrical power, ground loops between devices, cheap or unbalanced cables, dimmers and fluorescent lights, or nearby HVAC and computer fans. Because it sits at a fixed pitch with predictable harmonics, a clean hum is easy to target; but when it's mixed with crackle or buzz from failing gear, the underlying voice signal is harder to fully restore.
How to prevent background hum when recording
A few changes stop background hum before it starts:
- Use balanced XLR or TRS cables and keep them short and away from power cables to reject electrical interference.
- Plug your gear into the same outlet or power strip, and use a ground-lift adapter or DI box to break ground loops.
- Keep your mic and cables away from dimmers, fluorescent lights, power bricks, and computer monitors.
- Switch off air conditioning, fans, and noisy appliances while recording to cut HVAC rumble.
Background hum remover FAQ
Common questions about removing hum from audio.
Can AI really remove background hum from a recording?
Yes. StemSplit's AI separates the voice from background sounds, including steady electrical hum, then rebuilds a clean voice track. A constant 50/60 Hz hum cleans up very well; loud buzz mixed with crackle can be reduced but not always fully recovered.
Can background hum be removed completely?
A steady, moderate mains hum can be reduced so much that it becomes inaudible. Severe buzz layered with crackle from failing cables or gear can be improved but not fully removed, because the original voice signal underneath is damaged. For the best result, also follow the prevention tips when you re-record.
What's the difference between 50 Hz and 60 Hz hum?
Mains hum sits at the local power frequency — 60 Hz in North America and 50 Hz across most of Europe, Asia, and Africa — plus harmonics above it. StemSplit's AI targets the hum regardless of frequency, so you don't need to know which one your recording has.
Is the hum remover free?
You get 5 free minutes when you sign up, no card required. After that StemSplit is pay-per-minute with no subscription, so you only pay for what you clean.
What file formats are supported?
StemSplit supports MP3, WAV, FLAC, M4A, OGG, WEBM, and MP4. Audio is processed at studio sample rates and exported as a high-quality file.
Remove background hum from your recording
Upload any audio or video and cut the hum in seconds. 5 free minutes when you sign up, no card required.