Online Hum Remover (50/60 Hz).
Detect and remove steady electrical hum plus selected harmonics with narrow measured notches β while your recording stays on this device.
RESTORATION MAP
Mains Harmonic Notches
Separate the damaged event from healthy context. A repair is safest when the affected span is narrow, the surrounding signal is trustworthy and the difference audition contains mostly the defect.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
- Hummed recording
Start with the right material
Electrical buzz from power supplies, ground loops, lights or recording chains when the interference stays on a stable 50/60 Hz harmonic series.
- Notch hum harmonics
Understand the transformation
A bounded full-file scan compares energy around 50 Hz and 60 Hz, then stable O(n) biquad notches process the chosen fundamental and harmonic count per channel with adjustable Q, attenuation and wet/dry mix.
- Hum-reduced output
Verify the usable result
Original, processed and removed-signal previews, WAV/MP3 export and a receipt for the selected fundamental, treated frequencies, measured before/after energy and exact output dimensions.
Where this workflow stops
This targets steady tonal mains hum, not broadband hiss, changing buzz, room echo or clipping. Narrow notches also remove wanted musical energy at the treated frequencies, so verify the preview and measured result.
Make the final decision by ear
- Review every detected event near drums, consonants and other sharp attacks.
- Use Difference audition to hear what the repair removes or invents.
- Prefer several small repairs over one aggressive global pass.
- Input
- One decoded mono or stereo recording with steady tonal 50 Hz or 60 Hz mains hum.
- Controls
- Auto, 50 Hz or 60 Hz base; 1β8 harmonics; notch Q; attenuation; and wet/dry mix.
- Output
- Processed and removed-signal previews, measured per-frequency evidence, and local WAV or MP3.
How to remove 50 Hz or 60 Hz hum from audio online
- Load audio. Select a mono or stereo audio file. It is decoded locally in this browser.
- Detect or choose mains frequency. Use Auto to compare 50 Hz and 60 Hz families across the full file, or choose 50 Hz or 60 Hz manually.
- Set harmonic filters. Choose one through eight harmonics, Q, attenuation and wet/dry mix, then process the complete file.
- Verify and export. Compare original, processed and removed-signal previews, inspect measured frequency reduction, then export WAV or MP3.
Quick answer: this browser hum remover compares the 50 Hz and 60 Hz mains families across the complete decoded file. It then runs one stable constant-coefficient biquad notch per selected harmonic and channel. The output keeps the exact decoded frame count, sample rate, channel count and duration.
50 Hz versus 60 Hz mains hum
Electrical coupling from power supplies, grounding problems, lighting, cables and equipment can leave a steady tone in a recording. The base frequency often follows local mains power: 50 Hz in much of Europe, Africa, Asia and Australia; 60 Hz in North America and parts of South America and Asia. Geography is only a clueβthe recording itself is the evidence.
Auto mode measures sinusoidal energy at the first eight integer multiples of both candidates across the full file, then chooses the stronger family. The receipt keeps both family scores and the chosen fundamental. Manual mode is useful when a bass note overlaps a test frequency, interference drifts, or you already know the source.
What harmonic count, Q and attenuation mean
- Harmonics
- At 50 Hz the first four treated frequencies are 50, 100, 150 and 200 Hz; at 60 Hz they are 60, 120, 180 and 240 Hz. Add higher notches only when needed.
- Q / width
- Higher Q creates a narrower notch around each exact center. Lower Q removes a wider neighborhood and is more tolerant of drift, but can alter more useful sound.
- Attenuation
- Sets the target depth mixed at each notch stage, from 0 to 60 dB. Finite files, filter settling and nearby content mean measured reduction can differ from the control.
- Wet / dry
- Blends the complete notch chain with the original. At 100% wet you hear the filtered render; lower values retain more of the source.
Measured receipt instead of a cleanup claim
For every treated center, AudioWrench measures the sinusoidal component before and after processing across all channels. The receipt reports amplitude in dBFS, linear tone energy and measured reduction, plus total treated-bin energy, both 50 Hz and 60 Hz detection scores, the exact settings, frame dimensions and bounded work estimate.
The Removed signal is original minus processed. It shows everything changed by the notch chain and wet/dry blend; it is not a separated βnoise stemβ and it can contain useful musical content that occupied a treated frequency.
When this tool will not solve the noise
- Broadband hiss or wind: use Noise Remover; a bank of narrow mains notches does not model broadband noise.
- Noise between phrases: a Noise Gate may mute quiet gaps, but it does not repair noise under speech or music.
- Changing whine or drifting buzz: fixed 50/60 Hz harmonic centers cannot follow arbitrary moving tones.
- Clipped or missing detail: notch filtering cannot reconstruct waveform information already destroyed at recording time.
- Musical overlap: bass notes and fundamentals can occupy the same frequencies. Compare previews and use fewer, narrower or shallower notches when timbre suffers.
Local processing, privacy and memory limits
The selected file stays in this browser for decoding, full-file detection, filtering, measurement, preview and export. No account is required. The processor refuses unsafe output plus removed-signal allocations above a 256 MiB mobile or 512 MiB desktop working limit; the input dropzone also applies the site-wide compressed-file size guard.
Normal page assets and the same-origin MP3 encoder can still be requested as described in the privacy notice. WAV is a new 16-bit PCM file. MP3 is a new local lossy encode, so neither export preserves original container metadata bit-for-bit.
Online Hum Remover (50/60 Hz): quick answer and technical limits
Quick answer: A local mains-hum remover that detects or accepts a 50 Hz or 60 Hz fundamental and attenuates selected harmonic multiples with narrow notch filters.
- Best for
- Electrical buzz from power supplies, ground loops, lights or recording chains when the interference stays on a stable 50/60 Hz harmonic series.
- How it works
- A bounded full-file scan compares energy around 50 Hz and 60 Hz, then stable O(n) biquad notches process the chosen fundamental and harmonic count per channel with adjustable Q, attenuation and wet/dry mix.
- What you get
- Original, processed and removed-signal previews, WAV/MP3 export and a receipt for the selected fundamental, treated frequencies, measured before/after energy and exact output dimensions.
Know before you use it: This targets steady tonal mains hum, not broadband hiss, changing buzz, room echo or clipping. Narrow notches also remove wanted musical energy at the treated frequencies, so verify the preview and measured result.
Privacy: Selected audio is processed in this browser and is not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice. Privacy details β