What it does
Adds real film grain, fine or heavy, in color or black and white, with presets for classic stocks like 35mm, 16mm, and Super 8.
Grain is what the picture is made of, not something sprinkled over the top. Film records light in millions of light-sensitive crystals, and development turns the exposed ones into opaque specks. How visible they are depends on the stock and, above all, on magnification: Super 8, 16mm, and 35mm can share the same emulsion, but the smaller the frame, the more it must be enlarged to fill a screen, so the same grain reads several times coarser. Faster film means bigger crystals, and pushing film in development exaggerates them further. That is why gauge and stock are the natural vocabulary for grain, and why the differences between them are real, not branding.
The phrase "film grain overlay" usually means a video file, a scan of developed film played over footage with a blend mode. Overlays carry authentic texture, but they are indifferent to the image underneath: they loop, they sit at one scale, and they add the same veil to a shadow as to a highlight. Real grain is tone-dependent. It rides the midtones hardest, thins out toward the ends of the curve, and leaves true black and paper white clean, because there is nothing there to be grainy. Synthesized grain is generated fresh for every frame from the image itself, so it behaves that way by construction, with no seam and no repeat.
The rest is character. Grain size works like enlarging the plate: coarser grain is the same texture magnified, not a different pattern. Color grain is its own subject, because color film records three layers that do not misbehave equally; the blue-sensitive record is the noisiest and the red the cleanest, so convincing color grain drifts apart per channel only slightly, and full rainbow speckle instantly reads as digital. And grain should be the sharpest element in the frame: on real film the image goes soft before the grain does, which is why softening the picture slightly underneath sharp grain reads as film, while sharp footage under mushy grain reads as a filter.
Signature looks
35mm print
Fine, tight grain breathing in the midtones, barely there until the light falls. The texture of a projected feature.
Super 8 diary
Coarse, lively grain over a softened image, the small frame blown up far past its comfort. Home-movie warmth built in.
Pushed Tri-X
Black-and-white grain with real bite, contrast climbing, shadows gritty. The reportage look of film shot in bad light on purpose.
Try it on your own footage
This effect runs live in the Modulate editor, free with no signup — or start from the free tool page for a guided setup.
Common questions
What is film grain, physically?
Film grain is the visible clumping of the particles that record the image: silver halide crystals that development turns into opaque silver in black-and-white film, and the dye clouds that replace them in color film. Because each frame has its own random arrangement, grain moves frame to frame, the constant boil that makes footage feel alive.
Is a film grain overlay the same as a grain effect?
No. An overlay is a recorded video of real grain composited on top of footage, and it treats every pixel the same: shadows, highlights, and blacks all get one uniform veil, and the clip loops. A synthesized grain effect generates the texture inside the image, scaling with tone so midtones carry the most and pure black stays clean, the way grain behaves on actual film.
Why is Super 8 so much grainier than 35mm?
Magnification. The grain in the emulsion is roughly the same size regardless of format, but a Super 8 frame is a fraction of the size of a 35mm frame, so filling the same screen enlarges it, grain and all, several times more. Smaller gauge means bigger apparent grain and a softer image, which is exactly the character people borrow when they want home-movie warmth.
Should film grain be colored or monochrome?
Both exist on real film. Black-and-white stock produces pure luminance grain, while color negative carries slightly different noise in each layer, with the blue record traditionally the worst behaved. The convincing digital version keeps color variation restrained, a gentle per-channel drift rather than full rainbow speckle, which is the fastest tell of fake grain.
How do I add film grain to a video?
Use a grain effect that synthesizes the texture per frame rather than looping an overlay file. Modulate’s Grain effect runs live on images and video in the editor, with film-stock presets like 35mm, 16mm, and Super 8 as starting points, and it stacks naturally with vignette and VHS effects for a full analog treatment.
Related effects
VHS effect
The full worn videotape package: color bleed, static, dropouts, wobble, and tracking errors.
CRT effect
The look of an old tube monitor: glowing phosphor stripes, slight color fringing, and a darkened vignette.
Vignette effect
Fades the image toward a colour at the edges of the frame, with an adjustable size, softness, and shape.
Dither effect
Early computer graphics look: the image is rebuilt from tiny dot patterns and a limited color palette.