PNG to ICO Converter

What Is the PNG to ICO Converter?

This tool converts a PNG image to Windows Icon entirely in your browser -- the file is decoded, redrawn onto a canvas, and re-encoded as ICO without ever being uploaded to a server. PNG is the single most common source format people already have when they need a favicon or app icon, so this fills what was otherwise a gap next to this site's JPG/WebP/GIF/BMP/SVG/AVIF-to-ICO converters.

How to Use This Tool

Click the upload area and choose a PNG file. The converted preview appears immediately; click Download to save it as a real .ico file.

Need to go the other way? Use the ICO to PNG tab above, or open the ICO to PNG converter directly.

Why Convert PNG to ICO

The most common reason to convert PNG to ICO is building a favicon or a Windows app icon -- most platforms that ask for a favicon file specifically want a real .ico, not a renamed PNG. This tool embeds your image as a single PNG-in-ICO entry (the same approach browsers themselves accept for a site favicon) rather than the old multi-resolution ICO bundles image editors sometimes produce. The image is never resized: it keeps its original pixel dimensions, and the ICO directory size fields are written as 0, which the ICO format treats as 256, so resize your source first if you need a specific icon size.

What the Tool Actually Produces

Your browser decodes the PNG, the tool draws it onto a canvas of the same pixel dimensions, and the canvas is saved as PNG again and wrapped in a minimal ICO container holding one image. There is no multi-size bundle, and only images larger than 256 pixels on a side are scaled down. A 512 by 512 PNG results in an ICO whose single image is 512 by 512. Transparency survives, because both PNG and the PNG-in-ICO container support it and no background is painted.

A technical detail: the icon directory entry records the real width and height of the image (256 is stored as zero, as the format defines). Modern browsers read the embedded PNG itself and cope, but some older Windows programs trust the directory value. A square source near 256 by 256 pixels gives the sharpest result.

Preparing the PNG

• Start square. The tool does not pad or crop, so a wide or tall PNG becomes a wide or tall icon, which most places will distort or letterbox.
• Design for tiny sizes. In a browser tab an icon may be shown at 16 or 32 pixels. Keep the artwork bold, with few thin lines and little text.
• Mind the size. Around 256 by 256 pixels is a sensible target. A 2000 pixel source makes a needlessly heavy icon file that gains you nothing when displayed tiny.
• Test on light and dark. A transparent background looks fine on one browser theme and can vanish on another if your artwork is dark or pale.

A Worked Example

Say your logo is a 256 by 256 PNG of 8 KB and your website builder only accepts a favicon with the .ico extension. Upload the PNG, check the preview and the reported 256 by 256 dimensions, and download the file. The size badge will show a figure close to the original, since the PNG bytes are simply wrapped with a small header of about 22 bytes. This is illustrative; your actual numbers come from the size badge in the tool.

Limits and Aftercare

• Single image only. Icon editors often bundle several sizes in one file. This tool does not, so scaling to tab or taskbar size is left to the browser or operating system.
• Animated PNGs give a still. Only one frame is drawn to the canvas.
• Favicons are cached hard. After uploading the new file, use a hard refresh or a private window to confirm it changed.
• Not just for websites. The same file works as a Windows shortcut icon, although shortcuts look best from a sharp, reasonably large source.

Frequently Asked Questions