See any image as a landscape of frequencies. Take its 2D Fourier transform, then blur, sharpen, or isolate features by masking frequencies and inverting.
Image FFT StudioLive
2D Fourier transform & frequency filtering
Original
Log-magnitude spectrum
Low-pass reconstruction
Controls
Image
Filter
Transform an image into its 2D frequency spectrum, mask frequencies by radius, then invert to see the effect. The cyan ring on the spectrum shows the cutoff.
Reading this result: Low-pass keeps only frequencies inside radius 18px of the DC center — the low frequencies that carry the overall shape and smooth tones. Discarding the high frequencies removes fine detail and edges, so the image blurs. 98.8% of the spectral energy survives (most energy lives near DC).
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
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How it works
A real radix-2 FFT runs row-then-column to compute the 2D discrete Fourier transform of a 128×128 image. The magnitude spectrum is fftshift-centered so the DC term sits in the middle, with low frequencies near the center and high frequencies at the edges. Masking frequencies by radius — low-pass keeps the center, high-pass keeps the edges, band-pass keeps a ring — and running the inverse FFT shows how each band contributes: low frequencies carry smooth overall structure, high frequencies carry edges and detail. This is the core of image compression (JPEG), denoising, and filtering.
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Ask the AI about this model
The math, the assumptions, real-world uses, or a code translation — explained for this exact simulation.
Is this 2D Fourier transform image frequency tool really free?▾
Yes. 2D Image FFT 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.