A generator of two-color bitmap images. Every generation is unique: the image is defined by a short seed, and the same link always opens the same image.
- Generative bases. Strange attractors (Clifford, de Jong, Svensson, Bedhead), Gray–Scott reaction-diffusion, flow lines, noise with domain warp (smoke, marble, contour lines, terraces), interference and moiré, heat field, ridges, ringed planets, spirals, Voronoi, superformula.
- Composition. Sometimes two layers (multiply, mask, difference, screen), mirror and kaleidoscope symmetry, full-frame, horizon or soft-fade composition, contour lines and posterization.
- Dithering. Atkinson, Floyd–Steinberg, Jarvis–Judice–Ninke, Stucki, Sierra Lite, Bayer 2/4/8, blue noise (void-and-cluster), IGN, dot and line halftone, threshold. Leave it on "Auto" or pick one manually.
- Quality filter. Variants that are too empty, too solid or structureless are discarded before they're shown.
- Format. 1:1, 4:5, 3:4, 2:3, 9:16, 16:9, 3:2, 21:9, A4 or a custom size up to 8192 px per side; pixel size from 1 to 16.
- Palettes. Eight two-color pairs plus custom colors. The palette changes instantly, without re-rendering.
- Export. PNG at exactly the chosen resolution, and SVG with the ink merged into rectangles.
- Links and history. All settings are stored in the page URL. The last 12 images are available in the history strip.
- Interface in Russian and English.
Hotkeys: Space — new image, ← → — history, P — PNG, S — SVG.
No build step: it's a static site built on ES modules, with the heavy computation running in a Web Worker.
npx serve .
Generator checks (determinism, variety, quality filter, SVG geometry):
node tests/run.js| File | What it does |
|---|---|
gen/rng.js |
seed → random number generator (cyrb128 + sfc32) |
gen/noise.js |
Perlin noise, fBm, ridged, domain warp |
gen/fields.js |
generative bases, coordinates normalized to the frame height |
gen/recipe.js |
seed → recipe: layers, symmetry, composition, tone, dithering |
gen/dither.js |
dithering algorithms |
gen/quality.js |
filter for boring results |
render.worker.js |
rendering in a background thread |
export.js |
PNG and SVG |
app.js, i18n.js |
interface and translations |
MIT with Attribution © 2026 oxolegit. Public use requires a visible link to this repository: https://github.com/oxolegit/bitmap