PNM is a generic term for PBM, PGM, and PPM formats from the Netpbm family.
VIFF (Visualization Image File Format) is an image format developed by Khoros for scientific visualization.
FreeFileConvert uses tuned encoding for PNM to VIFF conversions, preserving clarity while trimming file size. Finished images open instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload PNM files from desktop or tablet, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized VIFF results on any device you rely on.
Process up to 5 files sized 1024 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent VIFF images with dependable progress tracking.
PNM files use simple ASCII or binary format for portable image storage.
VIFF supports multiple bands, data types, and machine-independent binary format.
Upload your image file in the PNM format from your device.
Select VIFF as the output format and click Convert. Adjust optional settings if needed.
Download the converted image file. Each file stays available for up to 5 downloads.