Free Online ICO Converter

An ICO converter builds a real multi-resolution favicon.ico containing 16, 32, and 48 pixel frames from any image.

Your data is processed entirely in your browser and never sent to any server.

Instant results 100% private No signup needed

How to Use This Tool

  1. Upload an image — a square source gives the cleanest icons.
  2. The tool resizes it to 16, 32, and 48 pixel frames.
  3. Each frame is encoded as PNG and packed into one ICO container.
  4. Review the bundled-size previews to confirm they look sharp.
  5. Click Download ICO to save your favicon.ico.

What Is an ICO Converter?

ICO is the Windows icon container used for browser favicons and desktop shortcuts. A single .ico file holds several resolutions so the operating system or browser can pick the sharpest one for each context — a tiny tab versus a large taskbar icon.

Rather than renaming a PNG, this tool writes a proper ICO file. It resizes your source to 16×16, 32×32, and 48×48, encodes each as a PNG frame, then assembles a standards-compliant ICONDIR header and directory entries pointing at the embedded PNGs. PNG-in-ICO has been supported since Windows Vista and works in every modern browser as a favicon.ico.

Resizing, PNG encoding, and the ICO assembly all happen in the browser. Your source image is never uploaded, so brand artwork stays on your machine.

Frequently Asked Questions

What sizes are included in the ICO?
The tool bundles 16x16, 32x32, and 48x48 frames—the classic favicon set that covers browser tabs and bookmarks.
Is this a real ICO file?
Yes. The tool writes a proper ICO container that embeds PNG frames, not just a renamed image, so it works as a favicon.ico.
What's ICO used for?
Favicons (browser tabs), Windows app icons, and shortcut icons. ICO holds multiple resolutions in one file.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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