Digital · DSP

Biquad Filter Designer

Biquad Filter Designer lets you design cascaded biquad audio filters in your browser and export CMSIS-ready C coefficients — float32, Q31, and Q15 — for ARM DSP, with live Bode and Nyquist plots.

How it works

Choose a filter type, set cutoff, Q, and gain, and the designer computes the biquad coefficients and renders the frequency response in real time. Cascade multiple sections for higher-order filters, then copy the generated CMSIS-DSP C structures straight into your firmware. Everything runs locally in the browser — no account, no upload.

FAQ

Is Biquad Filter Designer free?

Yes. Biquad Filter Designer is free to use in your browser, with no account required.

Does Biquad Filter Designer work offline?

Yes. It is an offline-first tool that runs locally in your browser, so it keeps working without an internet connection.

Does Biquad Filter Designer collect my data?

No. There are no accounts, no servers, and no tracking — your data stays on your device.