G3 (Group 3) is a fax image format using ITU-T T.4 compression, the standard for document facsimile transmission.
PFM is a floating-point extension of the PGM format for HDR images.
FreeFileConvert uses tuned encoding for G3 to PFM conversions, preserving clarity while trimming file size. Finished audio streams instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload G3 files from desktop, tablet, or cloud storage, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized PFM results on any device you rely on.
Process up to 5 files sized 1000 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent PFM audio with dependable progress tracking.
G3 uses Modified Huffman (MH) run-length encoding optimized for black-and-white documents.
PFM files store grayscale or RGB images with 32-bit floating-point values.
Upload your image file in the G3 format from your device, Dropbox, or Google Drive.
Select PFM 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.