Favicon Generator
Favicon Generator creates a deterministic six-size favicon.ico locally from one square PNG without uploading it.
Purpose and limits
What this tool does
Create one multi-entry favicon.ico for common browser and desktop icon sizes.
- Input
- One square local PNG up to 20 MiB, 4,096 px per side and 16.7 MP.
- Result
- One local favicon.ico with PNG entries at 16, 32, 48, 64, 128 and 256 pixels.
How to use it
- Choose a square local PNG; it remains in this browser tab.
- Review the fixed six-size output and privacy notes.
- Create and download favicon.ico after checking the local result summary.
Limitations
- The source must be a structurally valid square PNG; malformed chunks, CRCs and oversized images are rejected.
- PNG compression bytes can differ between browser engines, while repeated output within one engine is deterministic.
- Output is normalized through an sRGB canvas; physical mobile-device support is not claimed.