GIF to BMP: why turn a GIF into a bitmap?
GIF and BMP are both old formats, but they are used differently today. GIFs are everywhere online, while BMP survives in places that need the simplest possible image file: embedded devices, small LCD and e-paper displays, industrial equipment, engraving and cutting software, and older Windows programs. This GIF to BMP converter bridges the two and writes an uncompressed 24-bit bitmap that such systems can read.
How the conversion works
- Your browser decodes the GIF. For animated GIFs, the first frame is used.
- The pixels are drawn onto a canvas.
- Transparent pixels are blended with the background color you choose.
- The result is written as a Windows BMP: 24 bits per pixel, no compression, bottom-up rows padded to four bytes, 72 DPI.
Palette vs true color
A GIF stores at most 256 colors in a palette, and each pixel is an index into that palette. The BMP produced here stores every pixel directly as a red, green and blue value (true color). The image looks identical, but the file uses three bytes per pixel. A 320 × 240 display image becomes about 230 KB, and a 1024 × 768 image about 2.4 MB. Some very constrained devices prefer 8-bit palette BMPs; if yours does, reduce the colors afterwards with your device's image tool.
Transparency
GIF transparency is binary: a pixel is either shown or not. Those invisible pixels need a real color in a 24-bit bitmap, so choose the background of the target display or material. For a black OLED screen use black; for engraving, white usually represents areas that should not be burned.
Typical uses
- Boot or status images for Arduino, ESP32 and Raspberry Pi projects that load BMP files from storage.
- Icons and sprites for retro games, emulators and modding tools.
- Artwork for vinyl cutters, laser engravers and embroidery software that import bitmaps.
- Images for legacy Windows applications that predate GIF support in their import dialogs.
Need a specific resolution? Resize with the image resizer, which can also output BMP. For a compact lossless file instead, use the GIF to PNG converter; to convert other bitmaps back, see BMP to PNG.
Everything happens in your browser with the canvas API: the image is never uploaded, and the converted file is created on your device.
If the device still will not show the image
Embedded software is often much stricter than a desktop image viewer. When a converted file opens on your computer but not on the target hardware, check these points:
- Exact dimensions. Many display drivers expect the bitmap to match the screen resolution, such as 128 × 64 or 320 × 240, and ignore or crop anything else. Resize before converting.
- Color depth. Some small displays only accept 1-bit monochrome or 16-bit (RGB565) data. A 24-bit BMP is the common input for the conversion tools those projects use, but it may not load directly.
- File size and name. A 24-bit bitmap grows quickly; make sure it fits the storage, and keep file names short if the device uses an 8.3 FAT naming scheme.