SFW is a proprietary image format from Seattle FilmWorks photo processing.
HRZ is an image format for slow-scan television (SSTV), used by amateur radio operators to transmit images over radio.
FreeFileConvert uses tuned encoding for SFW to HRZ conversions, preserving clarity while trimming file size. Finished images open instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload SFW files from desktop or tablet, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized HRZ results on any device you rely on.
Process up to 5 files sized 1024 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent HRZ images with dependable progress tracking.
SFW files contain images from Seattle FilmWorks digital photo service.
HRZ files contain low-resolution images optimized for transmission over narrow-bandwidth radio channels.
Upload your image file in the SFW format from your device.
Select HRZ 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.