X3F vs SUN — Comparison & Free Converter
Fast, instant X3F (SIGMA) to SUN conversion. No signup required. Just drop your .x3f file and get .sun in seconds.
Batch Settings
About X3F (SIGMA) to SUN Conversion
X3F or SUN — which format should you use? The answer depends on your needs. Here's a quick breakdown.
X3F is a widely used file format. It has common platform support. SUN is a widely used file format. It has common platform support.
So when should you convert X3F to SUN? This conversion is ideal when you When you need a SUN file. This conversion helps you convert between formats quickly.
Converting X3F to SUN maintains high quality with CocoConvert's optimised encoder settings.
If you've decided SUN is the right choice, CocoConvert makes the conversion effortless. Upload your .x3f file, pick SUN, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert X3F (SIGMA) to SUN
- 1
Choose your X3F file
Upload your .x3f file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to SUN
Select .sun from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large image files.
- 4
Get your SUN file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert X3F (SIGMA) to SUN
Your X3F file is decoded and re-encoded as SUN.
Your X3F file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in SUN format
The converted file is ready for download
Format Comparison
X3F (Sigma)
.x3f file
| Extension | .x3f |
| MIME Type | image/x-sigma-x3f |
| Category | Image |
SUN
.sun file
| Extension | .sun |
| MIME Type | image/x-sun-raster |
| Category | Image |
Should You Convert X3F (SIGMA) to SUN?
When to Convert
- ✓When you need a SUN file
Frequently Asked Questions
Should I use X3F or SUN?
It depends on your goal. X3F preserves full quality. SUN preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is SUN higher quality than X3F?
Not necessarily. Converting X3F to SUN maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert X3F to SUN on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for X3F to SUN?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for X3F to SUN?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.