How it works
Median filter for grain
The Median mode replaces each pixel with the median value of its neighbours — this is specifically effective at removing salt-and-pepper grain and ISO noise without blurring edges as much as a blur filter would.
Gaussian for smooth haze
The Gaussian mode applies a weighted blur that's softer than median. Best for images with a uniform hazy noise layer — like old scanned photos or slightly foggy images.
Passes = how deep it goes
More passes means the filter runs multiple times over the image. Use 1–2 for mild noise to keep detail. Use 3–4 only for heavy grain where some softness is acceptable.
100% browser, no upload
Everything runs on the Canvas API. Your image never leaves your device — no server, no storage, no account. Works offline once loaded.