G3 (Group 3) is a fax image format using ITU-T T.4 compression, the standard for document facsimile transmission.
MNG is an animation extension of PNG, supporting multiple frames with timing and transition effects.
FreeFileConvert uses tuned encoding for G3 to MNG 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 MNG 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 MNG audio with dependable progress tracking.
G3 uses Modified Huffman (MH) run-length encoding optimized for black-and-white documents.
MNG files contain multiple PNG or JNG images with animation control chunks.
Upload your image file in the G3 format from your device, Dropbox, or Google Drive.
Select MNG 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.