G3 (Group 3) is a fax image format using ITU-T T.4 compression, the standard for document facsimile transmission.
PNM is a generic term for PBM, PGM, and PPM formats from the Netpbm family.
FreeFileConvert uses tuned encoding for G3 to PNM conversions, preserving clarity while trimming file size. Finished images open instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload G3 files from desktop or tablet, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized PNM 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 PNM images with dependable progress tracking.
G3 uses Modified Huffman (MH) run-length encoding optimized for black-and-white documents.
PNM files use simple ASCII or binary format for portable image storage.
Upload your image file in the G3 format from your device.
Select PNM 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.