OTB to G4 Converter
Convert your otb files to g4 online & free
Group 4 FAX
How to convert OTB to G4
Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.
Choose "to g4"
Choose g4 or any other format you need as a result (more than 200 formats supported)
Download your g4
Let the file convert and you can download your g4 file right afterwards