X3F (RAW) to OTB Converter
Convert your x3f files to otb online & free
Sigma Camera RAW Picture File
How to convert X3F to OTB
Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.
Choose "to otb"
Choose otb or any other format you need as a result (more than 200 formats supported)
Download your otb
Let the file convert and you can download your otb file right afterwards