Convert PNG to ICO Online Free

Q: How do I make a favicon from a PNG?

Drop your PNG into the converter at the top of this page and it converts to ICO automatically. The result is a favicon-ready ICO file. For best results start from a square image of 256x256 pixels or larger.

Q: What size will my ICO file be?

Browsers cap ICO dimensions at 256x256 pixels, so AllConvert automatically scales larger images down while keeping the aspect ratio. Smaller images are kept at their original size.

Q: Is the PNG to ICO conversion really free and private?

Yes. The conversion runs entirely in your browser using JavaScript — your image is never uploaded to any server, and there is no signup or fee.

Need a favicon for your website? AllConvert turns any PNG into an ICO file in seconds, right in your browser. No file upload, no account, no software to install.

Why convert PNG to ICO?

ICO is the classic icon format that browsers, Windows and many applications expect. The most common reason to create one is a website favicon — the small icon that appears in browser tabs, bookmarks and search results. While modern browsers accept PNG favicons, ICO remains the most universally compatible choice and works everywhere, including older browsers and Windows desktop shortcuts.

What happens during the conversion?

AllConvert renders your PNG onto a canvas and packages it as an ICO file. Browsers cap ICO dimensions at 256×256 pixels, so larger images are automatically scaled down while keeping their aspect ratio. For the sharpest result, start from a square image that is 256×256 or larger — a square source avoids any letterboxing and gives you a crisp icon at every size.

Tips for a great favicon

Keep the design simple: favicons are displayed as small as 16×16 pixels, so fine detail and thin text disappear. Bold shapes, strong contrast and a transparent or solid background work best. Once you have your ICO, drop it in your site root as favicon.ico or reference it with a <link rel='icon'> tag.

How to convert

Drop your PNG into the converter box at the top of this page, or click the box to choose a file.
The ICO is generated on the spot, on your device — nothing gets uploaded.
Click the download button that appears to save your new favicon.

The whole conversion runs in your browser tab — nothing uploaded, nothing installed — and works the same on desktop and mobile.

Need another format? Try the full converter

Why 256×256 is the ceiling

The .ico format was built to bundle several resolutions of the same icon in one file — traditionally 16×16, 32×32 and 48×48 side by side — so Windows could pick whichever size fit the context: a title bar, a desktop shortcut, a taskbar button. The 256×256 cap traces back to the format's original header, which stores each icon's width and height in a single byte apiece; a byte can only hold 0-255, and 0 is used as a stand-in for 256, so there's no way to describe anything bigger. Modern browsers scale a single-resolution ICO down just fine for a tab icon, which is why a straightforward PNG-to-ICO conversion works for favicon use.

Frequently asked questions

How do I make a favicon from a PNG?
Drop your PNG into the converter on this page and it converts to ICO automatically. Start from a square image at 256×256 or larger for the sharpest result.

What size will my ICO file be?
Browsers cap ICO dimensions at 256×256 pixels, so larger source images get scaled down automatically while keeping their aspect ratio. Smaller images stay at their original size.

Is the PNG to ICO conversion really free and private?
Yes. It runs entirely in your browser's JavaScript — nothing is uploaded, and there's no signup or fee involved.