How to Use the Multi-Size ICO & Favicon Packer
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1
Upload a square high-resolution PNG or SVG logo.
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2
Select included icon resolutions (16x16 for browser tab, 32x32 for desktop taskbar, 48x48 for Windows explorer).
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3
Preview rendered sizes side by side with transparent checkerboard background.
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4
Click "Generate & Download favicon.ico" to receive a real binary ICO file.
Practical Example & Use Case
Common Real-World Scenario
Packaging website logos into an authentic multi-layer favicon.ico that works on all legacy and modern browsers seamlessly.
Technical Notes & Limitations
Browser Engine Architecture
Packs valid ICO header structures and embedded PNG bitmaps completely in client-side binary ArrayBuffers.
Frequently Asked Questions
Is this a real .ico file or just a renamed .png?
It is a genuine Microsoft ICO binary structure containing real directory entries and multi-resolution bitmap payloads.