OTB is a bitmap format for mobile devices, used for operator logos and graphics sent via SMS.
Sun Raster is an image format from Sun Microsystems workstations.
FreeFileConvert uses tuned encoding for OTB to SUN conversions, preserving clarity while trimming file size. Finished audio streams instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload OTB files from desktop, tablet, or cloud storage, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized SUN 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 SUN audio with dependable progress tracking.
OTB images are small monochrome bitmaps optimized for mobile transmission.
Sun Raster files can contain 1, 8, 24, or 32-bit images with optional RLE compression.
Upload your image file in the OTB format from your device, Dropbox, or Google Drive.
Select SUN 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.