How to convert BMP to PNM
- Add your .BMP file - drop it in the box above or click to browse.
- Convert it to .PNM in a few seconds.
- Download your new .PNM file.
What to expect
- Both formats are uncompressed raster, so the conversion is lossless with no re-encode.
- File size stays similar to the BMP; PNM offers no compression.
- The color type maps to a PNM sub-format (PPM for color, PGM for grayscale, PBM for bitonal).
Frequently asked questions
Is any quality lost converting BMP to PNM?
No. PNM (PBM/PGM/PPM) stores raw uncompressed pixels, like BMP, so the conversion is lossless and every pixel value is preserved. It simply rewrites the image in a simpler container.
Why convert BMP to PNM?
PNM is an extremely simple, uncompressed format that image-processing tools and scripts (via ImageMagick, GIMP, Netpbm) handle easily. Converting is handy for pipelines that expect that plain raster layout.
Where does the PNM open?
PNM opens in GIMP, IrfanView, and XnView on any platform. Because the format is so plain, it is also trivial for custom scripts and command-line tools to read and write.
Will the file be smaller than the BMP?
Generally no. Both formats are uncompressed, so a PNM is roughly the same size as the BMP; PNM's value is simplicity, not compression. For smaller files, a compressed format like PNG is the better target.
Programs that convert BMP: Picture Resize Free Online Images Converter · Ability Photopaint · XnConvert
