Audio Bandpass Filter
Apply a bandpass filter to isolate a specific frequency range in audio. Only frequencies near the center frequency pass through, cutting both highs and lows. Perfect for isolating instruments or creating telephone effects.
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Complete Guide: Audio Bandpass Filter
Everything you need to know about using this tool effectively
The Audio Bandpass Filter lets only frequencies near a center frequency pass through, cutting both higher and lower frequencies. This is useful for isolating specific instruments, creating telephone or radio effects, focusing on particular frequency ranges, and cleaning up audio. All processing happens in your browser.
This tool applies a bandpass BiquadFilter via the Web Audio API. It attenuates frequencies both above and below the center frequency, letting only a band of frequencies through. The width of the band is determined by the Q factor.
Telephone and Radio Effects
Set the center frequency around 1000-2000 Hz to simulate the narrow bandwidth of a telephone or old radio. This is a staple effect in film and music production.
Isolating Instruments
Focus on the frequency range of a specific instrument. Bass guitar sits around 60-250 Hz, vocals around 300-3000 Hz, and cymbals above 5000 Hz.
Removing Unwanted Content
If your audio has both low rumble and high hiss, a bandpass filter removes both at once by keeping only the useful middle frequencies.
Sound Design
Sweep the bandpass frequency across time for filter sweep effects, or use it to create thin, focused tones from complex source material.
Upload Your Audio
Drag and drop or click to upload your audio file.
Set the Center Frequency
Choose the frequency you want to keep. Everything significantly above and below this frequency will be attenuated.
Preview and Adjust
Listen to the filtered result. Move the frequency to find the range that captures what you need.
Download
Download the filtered audio for use in your project.
A center frequency of 1000-2000 Hz creates a classic telephone effect
Human speech intelligibility sits mostly between 300-3000 Hz - keep the center in this range for clear voice
Combine with distortion for aggressive filtered sounds used in electronic music
Use bandpass to preview what a specific frequency range sounds like before applying EQ
What is the difference between bandpass and lowpass/highpass?
A low-pass filter removes highs. A high-pass filter removes lows. A bandpass filter does both simultaneously, keeping only a band of frequencies around the center frequency.
What frequency should I use for a telephone effect?
Real telephone bandwidth is roughly 300-3400 Hz. Setting the center frequency to about 1000-1500 Hz with the default Q gives a convincing telephone sound.
What audio formats are supported?
Any format your browser can decode, which typically includes MP3, WAV, OGG, FLAC, AAC, and WebM. The output is downloaded as a WAV file to preserve quality.
Does this upload my files?
No. All processing runs locally in your browser. Your files never leave your device.