High ISO noise simulation.

Film grain comes from silver halide crystals: organic, slightly clumped, uneven in size. Digital noise is per-pixel randomness with no structure. The tool simulates film grain, which most people find more pleasing than sensor noise.

Pushing, underexposing and overdeveloping, makes grain much heavier. Monochrome grain at 40 to 60 with black and white on gives pushed Tri-X; film grain at 35 to 50 in color gives pushed color negative.

Roughly: ISO 400 at 8 to 12 percent, 800 at 15 to 20, 1600 at 25 to 35, 3200 and above at 40 to 60. Film is not linear, so adjust to the picture.

Yes. Photojournalism has always accepted grain as the mark of difficult light. Monochrome grain at 20 to 35 gives that gritty, honest texture.

Film grain at 25 to 40 percent in color. The colored specks read like pushed color film under stage lights, with high contrast and deep shadows.

Color-matched grain at 20 to 35: it textures the frame while keeping the neon and shadow palette intact. Higher amounts make the street grittier.

Film grain scatters random colored specks, like expired color film. Monochrome grain is gray only, the silver halide look. Color-matched grain nudges each speck a little away from the pixel's own color, so it blends. Sampled grain reuses colors found elsewhere in the photo, and tinted grain uses one color you pick.

The amount is the share of pixels that get a speck. 8 to 15 percent adds texture you feel more than see; 20 to 40 is visible film character; above 50 it reads as damaged or experimental film.

Each pattern is random, and no two frames of real film share one either. Click New pattern until the specks fall where they suit the photo; the same amount and style keep a series consistent even though every pattern differs.

No. The file is decoded, drawn and re-encoded by your browser's canvas, and the page makes no request with it. You can load the page, go offline and keep working; nothing is stored either.

No. The "High ISO noise simulation" tool is free and opens without a sign-in, an account or an install.

Nothing. The "High ISO noise simulation" tool holds your input in the page's memory, so closing or reloading the tab clears it, and it saves nothing in this browser.

Up to 100 MB per file, the limit the tool states under its drop area. A larger file is refused with a plain message instead of being decoded.

No, it takes one file at a time. If you drop or choose several, only the first is used; run the tool again for the next one.

The edit is written as a PNG because PNG stores every pixel exactly, with a full alpha channel, so the result can be edited again without a second round of loss.

No. The browser decodes the image and the tool writes a new file from its pixels, so camera EXIF, GPS position and text chunks in the original are not copied into the result. Keep the original file if you need them.

No. The result has the same width and height in pixels as the source.

Closest to the "High ISO noise simulation" tool: Photo grain generator, Cinematic color grading, JPEG mood color editor, Add grain to a JPG. Each opens on its own page, free and in the browser.

The "High ISO noise simulation" tool is one of 44 in its group. The group's page, /tools/jpg, lists them all.

The tool is free. Its interface is built from shadcn.io's own components (Button, Input, Slider and the rest of the registry under /ui), which come in React, Vue, Svelte and Solid. Pro adds the blocks and templates for the product around it.