How to Convert G3 to SUN — Quick & Free
Fast, instant G3 (FAX) to SUN conversion. No signup required. Just drop your .g3 file and get .sun in seconds.
Batch Settings
还在为那些老旧的G3格式文件发愁吗？尤其是在咱们日常分享、游戏截图或者工作流转中，遇到这种不太兼容的格式，确实让人头疼。别担心，我们理解您的困扰！现在，我们将G3文件轻松转换成更现代、更通用的SUN格式。SUN格式以其高效的压缩和广泛的兼容性，在各种设备上都能流畅显示，让您的图像文件焕发新生。无论是用于移动端展示，还是在各种应用中无缝使用，这次转换都能让您的文件变得更实用、更便捷。
- 微信朋友圈分享
- 游戏截图编辑
- 旧文档图像更新
在大陆和台湾地区，G3格式主要出现在一些老旧的传真或扫描设备中。将其转换为SUN格式，能更好地适应当前主流的图片查看器和编辑软件，方便跨平台使用和分享，尤其是在移动设备上浏览更为流畅。
About G3 (FAX) to SUN Conversion
Short answer: yes, you can convert G3 to SUN online for free, and quality is well preserved with the right settings. Just upload your .g3 file to CocoConvert, pick SUN as the output, and click Convert. The whole process takes seconds.
Now for the details. G3 is a widely used file format. SUN is a widely used file format. Converting between these two formats lets you convert between formats quickly.
Your G3 file is decoded and re-encoded as SUN. Converting G3 to SUN maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert runs entirely online — no software to install, no account to create. Your files are encrypted during upload (TLS), processed on isolated servers in Germany, and permanently deleted after 24 hours. It works in Chrome, Safari, Firefox, Edge, and all mobile browsers.
Need to convert more than one file? Free users can do 5 per hour. Pro gets 100 per hour with files up to 5 GB each.
How to Convert G3 (FAX) to SUN
- 1
1. Upload G3
Drop your .g3 file onto the page (or tap "Browse" on mobile). Add multiple files for batch conversion.
- 2
2. Select SUN
Choose .sun from the output dropdown. Settings are pre-configured for best results.
- 3
3. Convert
One click. The server handles all the heavy lifting using FFmpeg and Sharp.
- 4
4. Download
Your .sun file is ready. Download it directly or get all files as a zip archive.
What Happens When You Convert G3 (FAX) to SUN
Your G3 file is decoded and re-encoded as SUN.
Your G3 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
G3 (FAX)
.g3 file
| Extension | .g3 |
| MIME Type | image/g3fax |
| Category | Image |
SUN
.sun file
| Extension | .sun |
| MIME Type | image/x-sun-raster |
| Category | Image |
Should You Convert G3 (FAX) to SUN?
When to Convert
- ✓When you need a SUN file
Frequently Asked Questions
Is G3 to SUN conversion free?
Yes. CocoConvert offers free G3 to SUN conversion with generous daily limits — 25 minutes of processing time and up to 5 files per hour (250 MB each). Pro plans remove these limits.
How fast is G3 to SUN conversion?
Most files convert in 2–10 seconds depending on size. Large image files may take 30 seconds. Batch jobs process in parallel for maximum speed.
What happens to my files after conversion?
Your uploaded G3 file and the converted SUN file are both automatically deleted from our servers within 24 hours. They are never shared, sold, or analysed.
Does converting G3 to SUN lose quality?
Converting G3 to SUN maintains high quality with CocoConvert's optimised encoder settings.
Can I convert SUN back to G3?
Yes, CocoConvert supports SUN to G3 conversion as well. However, if the original conversion involved lossy compression, converting back won't recover the lost data.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.