How to Convert ICO to G3 — Quick & Free
Fast, instant ICO to G3 (FAX) conversion. No signup required. Just drop your .ico file and get .g3 in seconds.
Batch Settings
您是否曾遇到这样的情况：手头有一个精美的ICO图标文件，却发现它无法在某些旧设备或特定应用中正常显示？尤其是在处理一些早期游戏资源、老式系统界面或需要兼容性极强的图形时，ICO格式的局限性就显现出来了。G3格式，作为ITU-T Group 3传真标准的一部分，虽然听起来有些“复古”，但在某些特定场景下，它凭借其高效的单色图像编码和出色的兼容性，依然是不可或缺的选择。将ICO转换为G3，不仅仅是格式上的简单转变，更是为您的图形资产拓展了应用边界，确保它们能在更广泛的环境中被识别和使用。无论您是需要为老旧系统准备图标，还是在带宽有限的环境下传输极简图形，这个转换工具都能帮您轻松实现。
- 老旧游戏图标兼容
- 传真机图形发送
- 低带宽设备显示
在中国大陆、台湾及新加坡，虽然G3格式在日常图像处理中不常见，但它在某些工业控制、早期医疗设备或特定政府机构的传真通信中仍有应用。ICO转G3能确保这些特殊工作流程中的图标显示无障碍。
About ICO to G3 (FAX) Conversion
Short answer: yes, you can convert ICO to G3 online for free, and quality is well preserved with the right settings. Just upload your .ico file to CocoConvert, pick G3 as the output, and click Convert. The whole process takes seconds.
Now for the details. ICO is the icon format used for website favicons and Windows application icons. G3 is a widely used file format. Converting between these two formats lets you convert between formats quickly.
Your ICO file is decoded and re-encoded as G3. Converting ICO to G3 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 ICO to G3 (FAX)
- 1
1. Upload ICO
Drop your .ico file onto the page (or tap "Browse" on mobile). Add multiple files for batch conversion.
- 2
2. Select G3
Choose .g3 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 .g3 file is ready. Download it directly or get all files as a zip archive.
What Happens When You Convert ICO to G3 (FAX)
Your ICO file is decoded and re-encoded as G3.
Your ICO file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in G3 format
The converted file is ready for download
Format Comparison
ICO
.ico file
| Extension | .ico |
| MIME Type | image/x-icon |
| Category | Image |
G3 (FAX)
.g3 file
| Extension | .g3 |
| MIME Type | image/g3fax |
| Category | Image |
Should You Convert ICO to G3 (FAX)?
When to Convert
- ✓When you need a G3 file
Frequently Asked Questions
Is ICO to G3 conversion free?
Yes. CocoConvert offers free ICO to G3 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 ICO to G3 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 ICO file and the converted G3 file are both automatically deleted from our servers within 24 hours. They are never shared, sold, or analysed.
Does converting ICO to G3 lose quality?
Converting ICO to G3 maintains high quality with CocoConvert's optimised encoder settings.
Can I convert G3 back to ICO?
Yes, CocoConvert supports G3 to ICO 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.