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FB2 at a glance
FB2
FB2 became especially visible in Eastern European ebook ecosystems, where community standards and open library habits shaped ebook distribution differently from Kindle or EPUB-first markets.
ICO at a glance
ICO
ICO grew with the Windows desktop experience, where applications needed icons that scaled across shell views, toolbars, shortcuts, and later higher-DPI environments.
Format comparison
| Feature | FB2 | ICO |
|---|---|---|
| File type | Ebook | Image |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2004 | 1985 |
| Inventor | Russian eBook community | Microsoft |
| Status | active | active |
| Primary use cases |
|
|
When to use each format
When to use FB2
- Your source file is already in FB2.
- Preserve source expectations before exporting to ICO.
- FB2 is commonly used in ebook workflows.
When to use ICO
- Your target workflow expects ICO.
- Improve delivery compatibility with ICO.
- ICO is commonly used in image workflows.
FAQs
Why convert FB2 to ICO?
Convert to ICO when preparing Windows application icons, installer assets, or other desktop-interface graphics that require native icon packaging.
It is useful when multiple icon sizes must travel in a single platform-friendly file.
What changes when converting FB2 to ICO?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting FB2 to ICO?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.