Random Bitmap Generator

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What this tool does

Generates a random bitmap pattern of colored or greyscale squares, directly in your browser. Set the grid size and square size, choose Greyscale or Color mode and Binary (on/off) or Full (0-255) values, then generate one image or a whole batch at once, reproducibly, using a Seed number.

How It Works

The tool builds an image out of Grid Width times Grid Height squares, each Square px pixels wide and tall. A seeded pseudo-random number generator (the same seed always produces the exact same sequence of numbers) is stepped once per square, in order, to decide that square's color: in Binary mode, the next random number is compared against the Density percentage to decide on or off; in Full mode, the next random number (or three, one per channel, in Color mode) is scaled directly into a 0-255 value. Every pixel inside a given square is filled with that one color, producing the blocky mosaic look. When Quantity is greater than 1, each additional image reuses the same settings but starts from the next seed number, so the batch is fully reproducible image by image, and can be downloaded together as a ZIP file.

Problems it solves

• Creating placeholder or noise-texture images for design mockups, testing, or backgrounds.
• Generating a batch of unique but reproducible pattern images at once for a project.
• Recreating the exact same random pattern later by reusing the same seed and settings.

Frequently asked questions