Convert SF3 to SUN Online
Convert SF3 images to SUN format free, fast, and privately in your browser.
Drag & drop files, or browse
Up to 20 images at once
How to convert SF3 to SUN
Upload your files
Drag & drop or browse up to 20 SF3 files at once.
Browser converts locally
Files convert to SUN in your browser - nothing is uploaded anywhere.
Download results
Save files individually or download everything as a ZIP bundle.
Why use this converter
100% Private - Nothing Uploaded
Your SF3 files never leave your device. All conversion happens locally inside your browser using WebAssembly. Zero server contact.
Batch + ZIP Download
Convert up to 20 SF3 files to SUN at once and download them all as a single ZIP archive in one click.
Lossless Output Quality
SUN is a lossless format - every pixel from your SF3 file is preserved exactly with no compression artifacts.
Instant Conversion
Your SF3 files convert to SUN in seconds using WebAssembly - no waiting, no queues.
Frequently asked questions
4 questionsUpload your SF3 files by dragging them into the drop zone or clicking Browse. Select up to 20 files at once, then click Convert. Your files are processed locally in your browser and ready to download in seconds - no account or internet connection needed after the page loads.