PGX is a raw image format used for JPEG 2000 compliance testing.
G3 (Group 3) is a fax image format using ITU-T T.4 compression, the standard for document facsimile transmission.
FreeFileConvert uses tuned encoding for PGX to G3 conversions, preserving clarity while trimming file size. Finished images open instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload PGX files from desktop or tablet, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized G3 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 G3 images with dependable progress tracking.
PGX files contain uncompressed image data with a simple header for codec verification.
G3 uses Modified Huffman (MH) run-length encoding optimized for black-and-white documents.
Upload your image file in the PGX format from your device.
Select G3 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.