Convert PNG to ICO Online — Create Favicons Instantly

Turn any PNG into a multi-size ICO favicon file.

How It Works

  1. 1Upload a PNG image by dragging it into the drop zone or clicking to browse.
  2. 2Choose which icon sizes to include (16, 32, 48, 64, 128, 256 px).
  3. 3Click Download to save the multi-resolution .ico file.

About PNG to ICO

ICO files are the standard format for website favicons — the small icon shown in browser tabs, bookmarks, and Windows shortcuts. While modern browsers accept PNG favicons, the ICO format remains essential for compatibility with older browsers, Windows desktop shortcuts, and certain platforms that specifically require .ico files. This tool converts your PNG image into a proper ICO file containing multiple sizes (16x16, 32x32, and 48x48) packed into a single file, following the ICO format specification. The tool automatically resizes your source image to each required dimension using high-quality resampling, so you only need to upload one image. For best results, start with a square PNG at 48x48 pixels or larger. Common use cases include creating favicons for websites, generating icons for Windows applications, and preparing shortcut icons for desktop tools.

From the blog

Frequently Asked Questions

What is an ICO file?

ICO (Icon) is a file format that contains one or more images at multiple sizes and color depths. It's the standard format for website favicons (the small icon in browser tabs) and Windows desktop icons.

What sizes are included in the ICO file?

The generated ICO file contains three sizes: 16×16 (browser tab), 32×32 (browser tab on high-DPI), and 48×48 (Windows shortcut). These cover all standard favicon use cases.

Where do I install the favicon on my site?

Drop the .ico file at the root of your domain as /favicon.ico — browsers request it automatically. For full coverage, also add <link rel="icon" href="/favicon.ico" sizes="any"> to your HTML <head>.

Is my file uploaded to a server?

No. Transmute processes everything locally in your browser using JavaScript and the Canvas API. Your files never leave your device — there is no server, no upload, no cloud processing.

Related Tools

Favicon Generator

Generate a complete favicon set from one image — ICO, Apple Touch, Android, and PWA manifest icons. Download as a ready-to-deploy ZIP.

SVG to PNG

Convert SVG vectors to PNG raster images at any resolution. Set custom dimensions for retina, social media, or print-ready exports.

Image Resizer

Resize images to exact dimensions or social media presets (Instagram, Twitter, LinkedIn). Lanczos3 resampling preserves sharpness.

Image Compressor

Compress JPG, PNG, and WebP images by quality or to a target file size in KB. Smart binary search picks the best quality automatically.