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SimuChar

* Choose an option.

Bitmap Editor for Microcontroller Firmware.

SimuChar is an interactive tool for creating and editing black-and-white bitmaps, with direct export to code formats usable in microcontroller firmware.

Click on any cell to toggle it between black and white. The grid auto-resizes to fill the window.

Control Panel

On the right side you can set:

  • Width / Height: Grid dimensions from 1×1 up to 64×64 pixels.
  • Format: Choose output format for the data panel below:
  • C Code: const uint8_t bitmap[] = { 0xFF, 0x00, ... };
  • Asm: .data / .byte assembly directives.
  • Hex: Space-separated hexadecimal bytes per row.
  • Vertical Encoding: When checked, bytes are column-major (each byte groups 8 vertical pixels). Default is row-major (horizontal) encoding.

Toolbar

  • Load: Import a PNG, BMP, or JPG image — grayscale is converted to black-and-white.
  • Save / Save As: Export the bitmap to a PNG, BMP, or JPG image file.
  • New: Clear the grid to all white pixels (current dimensions are kept).

Data Export Panel

The bottom panel shows the generated code or data in real time. Select a format in the control panel and the output updates automatically. Copy the text for use in your firmware projects.