A PNG to ICO converter rasters the source to 16, 32, 48, and 256 px PNG images and packs them into a real multi-size .ico. Vista-style PNG-in-ICO is used. The file never uploads. The existing emoji favicon tool still makes a single PNG; this page is the icon container.
ICONDIR lists each layer. Each ICONDIRENTRY points at a PNG payload. Width 256 is stored as 0 in the classic 1-byte field. Windows and browsers pick the nearest layer.
Drop a PNG. A multi-size .ico with 16, 32, 48, and 256 px layers is built locally.
Results can be wrong. This calculator is unofficial. Figures can be incomplete, rounded, or not updated. Use them at your own risk and check a tape, datasheet, ball band, or official chart before cutting, mixing, buying, or publishing. Limits of liability are in the terms of service.
Yes. PNG-compressed layers inside an ICO directory.
Rasters an SVG to a transparent PNG at a chosen width in the browser.
Converts pixel dimensions to inches and centimetres at a chosen DPI.
Tap-to-reveal PNG for X and Twitter. Timeline preview versus opened view, brush masks, PNG8.
Publisher notes · reviewed 29 October 2026
16, 32, 48, and 256 px PNG images are packed into ICONDIR. Width 256 is stored as 0 in the classic byte. The emoji favicon tool still emits a single PNG; this page is the container.
PNG payloads keep alpha. Old BMP-only ICO writers are not used.
favicon.ico
Four PNG layers, downloaded locally.
