CodesBeautify

Random Bitmap Generator

Build a grid of random zeros and ones, thirty two bits wide, ready to paste into code or use as noise data.

Bitmap rows16 generated
00111000010100101000001010110110
00100101001011100111111001011100
01010000100010011011001110000101
10101110111001111101111000010111
01011001101000111010000101110101
11011110110101100110011010110111
00100000110111001111010011000010
10110111011111000001100010000001
10001100000101000010100111001010
00110000011110100101100000100000
01110010111010011111001001001110
00100001111011111111000001011100
10100100111011010011001001000101
11100000111011101101010100000111
01010010011011110101110100110001
11011000101000111110101011011001
Runs locally in your browser

About the Random Bitmap Generator

A bitmap in the simplest sense is a rectangle of on and off pixels. This generator produces that rectangle as text: every row is thirty two independent bits, and the row count decides the height, so sixteen rows give you a 32 by 16 monochrome field of pure noise.

Rendered in a monospaced font the grid looks like static, which is exactly what you want when testing an image pipeline, checking that a compression routine handles incompressible input, or demonstrating why random data does not shrink. Programmers also use a block like this to seed cellular automata, to prime a dithering experiment, or to fill a sprite sheet placeholder during prototyping.

Choose the grid layout to keep one row per line, or the single stream layout to get one long run of bits with spaces between rows, which suits pasting into an array literal. Duplicate rows are permitted by default because a truly random field should be allowed to repeat, and at thirty two bits wide a collision is astronomically unlikely anyway. To turn a row into hexadecimal, drop it into the Number Base Converter, and use the Random Byte Generator when you want the same noise expressed as hex bytes.

How to use

  1. Set Rows to the height you want, keeping in mind each row is 32 bits wide.
  2. Pick the grid layout for a visual block, or the single stream layout for code.
  3. Press Generate, then copy the block or download it as a text file.

Common questions

How wide is the bitmap?
Every row is 32 bits, so the width is fixed and only the number of rows changes.
Is this an image file?
No, it is text. View it in a monospaced font to see the noise pattern, or feed the bits into your own renderer.
Why would I need random bits like this?
They are useful for compression tests, cellular automata seeds, dithering experiments and placeholder sprite data.
Can I get more than 200 rows?
Two hundred is the per press limit. Press Generate again and append the next block if you need a taller field.