X3F is the RAW image format used by Sigma cameras with Foveon X3 sensors.
OTB is a bitmap format for mobile devices, used for operator logos and graphics sent via SMS.
FreeFileConvert uses tuned encoding for X3F to OTB conversions, preserving clarity while trimming file size. Finished audio streams instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload X3F files from desktop, tablet, or cloud storage, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized OTB 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 OTB audio with dependable progress tracking.
X3F files contain three-layer sensor data from Sigma Foveon sensors.
OTB images are small monochrome bitmaps optimized for mobile transmission.
Upload your image file in the X3F format from your device, Dropbox, or Google Drive.
Select OTB 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.