How to convert PGM to PPM
- Add your .PGM file - drop it in the box above or click to browse.
- Convert it to .PPM in a few seconds.
- Download your new .PPM file.
What to expect
- No color is added: each pixel's R, G, and B values are all set to the original gray level, so the image looks identical to the source.
- File size roughly triples - PPM stores three bytes per pixel for 8-bit images versus one byte in PGM.
- 16-bit PGM (Maxval above 255) converts correctly to 16-bit PPM with both ImageMagick and Netpbm.
Frequently asked questions
Does converting PGM to PPM add color?
No. Each gray value is mapped to an equal R, G, B triplet, so the image remains visually grayscale.
Why is the output PPM file so much larger?
PPM stores three channel values per pixel (RGB), while PGM stores one - for an 8-bit image the PPM is roughly three times larger with no extra visual detail.
Can I convert back from PPM to PGM?
Yes - Netpbm's
ppmtopgm and ImageMagick's magick output.ppm result.pgm both handle the reverse direction.Is Netpbm available on Windows?
Netpbm is not commonly packaged for Windows; use ImageMagick instead with
magick input.pgm output.ppm.
