High-Pass Filter Audio
Pick an audio file, set a cutoff frequency, and cut low-frequency rumble/hum in your browser — nothing is uploaded.
About this tool
High-Pass Filter Audio removes low-frequency content from a recording. A high-pass filter (also called a low-cut) lets everything above a chosen cutoff frequency pass through while attenuating everything below it — so rumble, mains hum, HVAC drone, table thumps, plosives, and mic handling noise fall away while speech and most instruments stay intact. Pick an audio file, set the cutoff and how steeply it rolls off, choose an output format, and download the result. Everything runs locally in your browser with a WebAssembly build of ffmpeg: your audio is never uploaded to a server.
It only reduces low-frequency energy. Broadband hiss, mid/high noise, or one-off sounds (a cough, a door slam) need a different tool — try the denoiser for steady hiss/hum across the whole spectrum.
Controls
- Cutoff frequency (Hz) — the corner frequency. Everything below it is cut, everything above passes. 80 Hz is the standard rumble cut that clears low-end junk without thinning a voice; bump it to 100–120 Hz for stubborn hum, or higher to thin the low end on purpose. Range 10–2000 Hz, default 80.
- Rolloff (steepness) — how sharply the filter cuts below the cutoff, in dB/octave. 6 is the gentlest and most transparent, 12 (default) is the natural choice for voice, 24 tightens the low end more, and 48 is a steep brick-wall cut that can start to thin the sound. Gentler slopes sound more natural; steeper slopes clear more low-end but can make voices sound thin.
- Output format — mp3 (192 kbps, default), wav, ogg, flac, or m4a.
Worked example
Upload a spoken-word recording interview.wav with a constant air-conditioner
rumble, set cutoff 100, rolloff 24 dB/oct, and choose wav. The tool
runs highpass=f=100:p=2,highpass=f=100:p=2 and returns
interview-highpass.wav — the same speech with the low drone gone. Want a smaller
file for the web? Switch the format to mp3 and you get
interview-highpass.mp3 at 192 kbps instead.
FAQ
What is a high-pass filter, and when should I use one?
A high-pass filter passes frequencies above a set cutoff and attenuates those below it — the opposite of a low-pass. Reach for it whenever a recording has low-frequency junk you want gone: room rumble, air-conditioner or traffic drone, 50/60 Hz mains hum, desk thumps, footsteps, or the boominess of a close-mic'd voice. It's the single most common first move when cleaning up voice, podcast, and field audio.
What cutoff frequency should I pick?
Start at 80 Hz — that clears most rumble without touching a voice, which lives well above it. If low hum or drone remains, raise the cutoff in 10 Hz steps toward 100–120 Hz. For overhead/cymbal or bright-instrument tracks, a cutoff around 120 Hz trims rumble without dulling the tone. Keep it low (below ~120 Hz) on material with real bass — a kick drum, bass guitar, or full music mix — so you don't hollow out the low end you want to keep.
What does the rolloff / steepness setting do?
Rolloff is how sharply the filter attenuates frequencies below the cutoff, in dB per octave. 6 dB/oct is a gentle 1-pole slope that's very transparent; 12 dB/oct (the default) is a natural-sounding 2-pole slope good for voice; 24 and 48 dB/oct cascade more stages for a tighter, steeper cut. Steeper slopes remove more low-end right below the cutoff but can start to sound thin or unnatural — gentle slopes are safer on music, steeper ones are handy for aggressive rumble control on speech.
Will this remove hiss or background chatter?
No. A high-pass only touches low frequencies. Steady broadband hiss (tape hiss, mic self-noise) and mid/high noise pass straight through, and it can't remove one-off events like coughs, clicks, or speech in the background. For steady hiss/hum across the whole spectrum, use a spectral denoiser instead; this tool is specifically for low-frequency rumble, hum, and handling noise.
Is my audio uploaded anywhere? What are the limits?
No. Processing happens entirely in your browser via a WebAssembly ffmpeg build — the file never leaves your device. Practical limits: input up to about 10 MB, output up to about 10 MB. Input can be any common audio format (mp3, wav, m4a, ogg, flac); output is mp3, wav, ogg, flac, or m4a. Very long or high-bitrate files may hit the size cap — trim or compress first.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool audio-highpass-filter 'url=https://example.com/input' 'cutoff=80' 'rolloff=12' 'format=mp3'New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/audio-highpass-filter/?url=https://example.com/input&cutoff=80&rolloff=12&format=mp3Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.