Filters keep the frequencies you want and reject the rest. Set the cutoff and order and watch the Bode magnitude curve roll off.
Active Filter (Bode Plot)Live
shaping a frequency response
Controls
Presets
A filter passes some frequencies and blocks others. The cutoff fc = 1/(2πRC) is where the response falls 3 dB; beyond it the magnitude rolls off at 20 dB per decade per order — steeper filters cut harder. Educational tool.
Reading this result: The −3 dB cutoff sits at 1.0 kHz, where the low-pass response begins to roll off. Order 2 sets the steepness at 40 dB/decade — a gentle slope that eases into the stopband with minimal ringing. Raising the order steepens the roll-off while adding phase lag around the cutoff.
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
★ Sign in to save this setupSave your tuned setup, or drop this simulation into your own site, docs, or course page.
How it works
A filter passes a band of frequencies and attenuates the rest. The cutoff fc = 1/(2πRC) marks the −3 dB point; beyond it the magnitude falls at 20 dB per decade per filter order, so higher-order filters cut more sharply at the cost of complexity. Educational tool.
✦
Ask the AI about this model
The math, the assumptions, real-world uses, or a code translation — explained for this exact simulation.
Is this active filter bode plot tool really free?▾
Yes. Active Filter (Bode Plot) runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.
Do I need to install anything?▾
No. Everything runs client-side in a modern browser — no downloads, no license, no account required to start.
Can I save or share my simulation?▾
Create a free account to save projects, and use a shareable embed or minted DOI to publish a live, interactive version anywhere.
How accurate are the results?▾
The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.