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BMP vs XPM

BMP vs XPM

A detailed comparison of BMP Image and X PixMap — file size, quality, compatibility, and which format to choose for your workflow.

Convert BMP → XPM Convert XPM → BMP
BMP

BMP Image

Raster & Vector Images

BMP is an uncompressed raster image format native to Windows. Files are large but preserve exact pixel data with no compression artifacts. Rarely used on the web due to file size.

About BMP files
XPM

X PixMap

Raster & Vector Images

XPM (X PixMap) is a color image format for the X Window System that stores pixel data as ASCII text with a color palette. Unlike XBM, it supports full color and transparency through a simple text-based representation.

About XPM files

Strengths Comparison

BMP Strengths

  • Dead-simple format — trivially easy to read and write.
  • Lossless and uncompressed — perfect bit-exact pixel storage.
  • Universally supported in Windows applications since 1985.
  • Supports 1, 4, 8, 16, 24, and 32-bit color depths.

XPM Strengths

  • Valid C source — directly embeddable in code.
  • Text-editable in any editor.
  • Transparency via "None" color value.
  • Stable since 1989 with no breaking changes.

Limitations

BMP Limitations

  • Enormous file sizes — no meaningful compression in typical use.
  • Not a web format — browsers support it but nobody serves BMPs over HTTP.
  • No metadata support (no EXIF, no ICC profile in practice).
  • Multiple header versions mean "a BMP" is ambiguous — parsers must handle several variants.

XPM Limitations

  • Enormous file sizes vs compressed formats.
  • Only useful within X11 / legacy Unix GUI ecosystem.
  • Limited color palette in classic form (256 colors max practical).
  • Superseded by PNG and SVG for modern UI.

Technical Specifications

Specification BMP XPM
MIME type image/bmp image/x-xpixmap
Extensions .bmp, .dib —
Compression None (typical); RLE 4/8 bit (rare) —
Color depths 1, 4, 8, 16, 24, 32 bits per pixel —
Byte order Little-endian —
Extension — .xpm
Encoding — ASCII text (valid C source)
Native environment — X Window System (X11)
Predecessor — .xbm (X Bitmap, 1-bit)

Typical File Sizes

BMP

  • Small icon (32×32) 4 KB
  • Screenshot (1920×1080) ~6 MB
  • 4K image (3840×2160) ~25 MB
  • Scanned A4 at 300 dpi ~25 MB

XPM

  • Small icon (32×32, 16 colors) 2-5 KB
  • Toolbar button set 10-50 KB

Ready to convert?

Convert between BMP and XPM online, free, and without installing anything. Encrypted upload, automatic deletion after 2 hours.

Convert BMP to XPM Convert XPM to BMP

Frequently Asked Questions

BMP (Bitmap) is a raster image format developed by Microsoft for Windows. It stores images with no compression by default, resulting in large file sizes but pixel-perfect quality. It has been part of Windows since version 1.0.

XPM (X PixMap) is an image format used to store raster graphics — a two-dimensional grid of pixels describing a picture. It is part of the raster & vector images family and designed around a specific trade-off between file size, visual fidelity, and feature support (transparency, colour depth, compression type). Photographers, web designers, and content creators choose XPM when its particular strengths match the publishing target.

BMP files open in Windows Paint, Photos, macOS Preview, GIMP, Photoshop, and virtually any image viewer. All Windows applications support BMP natively.

Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) open XPM natively. On mobile, iOS Photos and Google Photos display XPM in the gallery when supported by the OS. If the format is rare or new, convert to JPG or PNG first — both are universally readable — using our XPM to JPG or XPM to PNG converter.

PNG is better than BMP in almost every scenario since it provides lossless compression (smaller files), transparency support, and wider cross-platform use. BMP is mainly relevant for legacy Windows applications.

Upload the XPM to KaijuConverter and pick a target format (JPG, PNG, WebP, HEIC, TIFF, BMP, SVG, PDF). The conversion runs in the browser via ImageMagick and returns a download in seconds. No account or installation required; both input and output delete automatically within two hours.