Image format

PPM

Portable Pixmap: simple uncompressed raster samples for image-processing pipelines.

Convert PPM to

Choose a target format for your PPM images.

JPEGJPEGPPM → JPEG PNGPNGPPM → PNG WebPWebPPPM → WebP AVIFAVIFPPM → AVIF HEICHEICPPM → HEIC HEIFHEIFPPM → HEIF

All 21 conversions

GIFGIFPPM → GIFWith caveat TIFFTIFFPPM → TIFF BMPBMPPPM → BMP ICOICOPPM → ICO JPEG XLJPEG XLPPM → JPEG XL JPEG 2000JPEG 2000PPM → JPEG 2000 QOIQOIPPM → QOI TGATGAPPM → TGA PCXPCXPPM → PCX PGMPGMPPM → PGMWith caveat PBMPBMPPM → PBMWith caveat PAMPAMPPM → PAM HDRHDRPPM → HDR EXREXRPPM → EXR PDFPDFPPM → PDF

Marked paths may need steps such as flattening, rasterization, tone mapping or animation loss.

Convert to PPM

Choose a source format to convert to PPM.

JPEGJPEGJPEG → PPM PNGPNGPNG → PPM WebPWebPWebP → PPM AVIFAVIFAVIF → PPM HEICHEICHEIC → PPM HEIFHEIFHEIF → PPM

All 36 conversions

GIFGIFGIF → PPMWith caveat TIFFTIFFTIFF → PPM BMPBMPBMP → PPM SVGSVGSVG → PPM ICOICOICO → PPM JPEG XLJPEG XLJPEG XL → PPM JPEG 2000JPEG 2000JPEG 2000 → PPM QOIQOIQOI → PPM TGATGATGA → PPM PCXPCXPCX → PPM PGMPGMPGM → PPM PBMPBMPBM → PPM PAMPAMPAM → PPM HDRHDRHDR → PPMWith caveat EXREXREXR → PPMWith caveat PSDPSDPSD → PPMWith caveat PDFPDFPDF → PPMWith caveat DNGDNGDNG → PPM Canon CR2Canon CR2Canon CR2 → PPM Canon CR3Canon CR3Canon CR3 → PPM Canon CRWCanon CRWCanon CRW → PPM Nikon NEFNikon NEFNikon NEF → PPM Sony ARWSony ARWSony ARW → PPM Fujifilm RAFFujifilm RAFFujifilm RAF → PPM Olympus ORFOlympus ORFOlympus ORF → PPM Panasonic RW2Panasonic RW2Panasonic RW2 → PPM Pentax PEFPentax PEFPentax PEF → PPM Sigma X3FSigma X3FSigma X3F → PPM Kodak RAWKodak RAWKodak RAW → PPM Hasselblad 3FRHasselblad 3FRHasselblad 3FR → PPM

Marked paths may need steps such as flattening, rasterization, tone mapping or animation loss.

About PPM

Portable Pixmap

PPM is Netpbm’s simple RGB raster interchange format. Each pixel has red, green and blue samples with a declared maximum value. A short header defines dimensions and precision, making the layout convenient for programs that need direct access to colour samples rather than a complex image container.

P3 stores textual numbers; P6 stores binary samples. Binary samples use one byte when maxval is below 256 and two bytes, most significant first, otherwise, up to 65535. PPM has no alpha or compression. The specification describes nonlinear RGB samples; alternate linear or sRGB conventions require explicit workflow agreement.

Use PPM for colour-image processing, debugging and simple pipeline interchange. It makes pixels easy to inspect but files can be large and lack rich metadata. Confirm maxval and colour interpretation before importing scientific or rendered values; treating linear data as display-encoded colour changes the result.

Key capabilities

Compression: Uncompressed
Transparency: No
Animation: No
Extensions: .ppm
MIME type: image/x-portable-pixmap · Unregistered Netpbm convention
Metadata: Header, Comments
Best for: RGB processing & debugging
Colour depth: maxval up to 65535

Netpbm stores these samples without compression. Reducing colour, thresholding or changing maxval can still lose information before storage; text and binary representations change the layout, not its image meaning.

History of PPM

This format belongs to the documented Pbmplus/Netpbm evolution. The history distinguishes the original bitmap idea, later channel models and library development.

1980s
A simple interchange language
Jef Poskanzer invents PBM to exchange bitmaps using a representation simple enough for text-only email. Its aim is robust interchange between otherwise incompatible graphics tools.
1988
Pbmplus and colour formats
Poskanzer distributes Pbmplus in 1988 and adds PGM and PPM by the end of that year. The toolkit extends the original bitmap exchange to grayscale and RGB images.
1993
Netpbm replaces Pbmplus
Netpbm begins as a new release of the unmaintained Pbmplus package, with fixes and improvements contributed over the network. The format family remains a bridge among graphics tools.
2000-04
Two-byte samples
The maintained Netpbm distribution documents two-byte samples up to a maxval of 65535 and a defined byte order for PGM and PPM. This resolves ambiguity between earlier extensions.

PPM compared

Different formats, different trade-offs. Choose for the image and the workflow.

PGM

PPM vs PGM

PGM stores one grayscale sample per pixel. It is suitable for grayscale processing and masks; exporting a colour image requires a deliberate luminance conversion and removes colour information.

PBM

PPM vs PBM

PBM stores only black and white, one bit per pixel in its binary form. It fits bitonal masks and line art; tonal images need thresholding or dithering, so gradients cannot remain as continuous gray levels.

PAM

PPM vs PAM

PAM extends Netpbm with explicit tuple types and depths, including RGB_ALPHA and GRAYSCALE_ALPHA. It suits channel-aware processing, but receiving tools must agree on the tuple meaning and it remains uncompressed.

PNG

PPM vs PNG

PNG preserves decoded pixels losslessly and can carry alpha. It is useful for transparent graphics and screenshots; it does not preserve editable document layers or camera sensor data, and photographic files can be large.

PPM FAQ

What does this format store?

How does compression affect quality?

Are P3 and P6 different image types?

They are text and binary representations of PPM RGB samples. Switching representation does not add alpha or compress the image; a decoder must interpret maxval and the corresponding sample width.

What should I check before opening the file?

Check the magic number, sample precision and tuple or channel meaning. Many simple readers accept only one binary image and 8-bit samples even though the specifications permit more.

What changes when I export to another format?

Preserve maxval and colour interpretation when creating the rendered output. Grayscale and bitonal targets remove information deliberately; alpha requires an alpha-bearing tuple or a separate mask. Optional comments may not transfer.

When is this format useful?

Sources

PPM