How to convert PBM to PGM
- Add your .PBM file - drop it in the box above or click to browse.
- Convert it to .PGM in a few seconds.
- Download your new .PGM file.
What to expect
- The conversion is lossless: two-tone pixels map exactly into grayscale values.
- PGM is uncompressed with a byte per pixel, so the file is usually several times larger than the packed PBM.
- Both are niche Netpbm formats; general-purpose apps may need PNG for easy viewing.
Frequently asked questions
Is any detail lost converting PBM to PGM?
No. Both are uncompressed Netpbm rasters, and PGM's grayscale range fully contains PBM's two values, so the black-and-white pixels map exactly into gray levels with no loss.
Why convert PBM to PGM?
PBM stores only 1-bit black and white, while PGM adds grayscale. Converting gives a format that can then hold gray shades, useful before further editing or processing in the Netpbm family.
Where does a PGM open?
GIMP, IrfanView, and XnView open PGM on Windows, Preview or GIMP on macOS, and GIMP or Netpbm tools on Linux; general photo apps may not recognize it.
Will the file get bigger?
Likely yes. PBM packs eight pixels per byte in its binary form, while PGM uses at least one byte per pixel, so the uncompressed PGM is typically several times larger.
