BMP vs PNM — Differences, File Size & When to Use Each

BMP vs PNM

Ein detaillierter Vergleich von BMP Image und Portable Anymap — Dateigröße, Qualität, Kompatibilität und welches je nach Workflow zu wählen ist.

BMP → PNM umwandeln PNM → BMP umwandeln

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.

Über BMP-Dateien

PNM

Portable Anymap

Raster & Vector Images

PNM (Portable Anymap) is a family of simple image formats comprising PBM, PGM, and PPM. These formats store pixel data in straightforward ASCII or binary layouts, making them easy to generate and parse programmatically.

Über PNM-Dateien

Vorteilsvergleich

BMP Vorteile

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.

PNM Vorteile

Stupidly simple — a 50-line parser handles every variant.
ASCII variant is human-readable and diff-able.
Universal Unix tooling support.
40+ years of stability.
Wildcard extension covers three related formats.

Einschränkungen

BMP Einschränkungen

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.

PNM Einschränkungen

No compression — files are huge.
No color profile, metadata, or transparency.
Strictly a pipeline intermediate, not a delivery format.

Technische Spezifikationen

Spezifikation	BMP	PNM
MIME type	image/bmp	image/x-portable-anymap
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	—	.pnm (umbrella), .pbm, .pgm, .ppm
Variants	—	P1-P6 (ASCII or binary × bitmap/graymap/pixmap)
Toolkit	—	Netpbm
Creator	—	Jef Poskanzer (1988)

Typische Dateigrößen

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

PNM

512×512 grayscale (binary) ~256 KB
1920×1080 RGB (binary) ~6 MB

Bereit zum Umwandeln?

Wandle zwischen BMP und PNM online um, kostenlos und ohne Installation. Verschlüsselter Upload, automatische Löschung in 60 Minuten.

BMP zu PNM umwandeln PNM zu BMP umwandeln

Häufig gestellte Fragen

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.

BMP (Bitmap) is a raster image formato developed by Microsoft para Windows. It stores images com no compressão by default, resulting in large tamanho do arquivos mas pixel-perfect quality. It has been part of Windows since version 1.0.

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

BMP arquivos abrir in Windows Paint, Photos, macOS Preview, GIMP, Photoshop, e virtually any image viewer. All Windows aplicativos support BMP natively.

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.

PNG is melhor que BMP in almost every scenario since it fornece sem perdas compressão (smaller files), transparência support, e wider cross-platform use. BMP is mainly relevant para legacy Windows aplicativos.