FilmShader.js
FilmShader
Film grain

Preview requires WebGL2. You can still download the demo.
Image processing demo
Adds tiny moving specks like grain in a film movie. Higher grain strength makes the speckles easier to see.
Official sourceExported assets are free to use commercially and modify.
Film grain

Adds tiny moving specks like grain in a film movie. Higher grain strength makes the speckles easier to see.
Official source