Pureico
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ICO · ICNS · Extension icons

Crisp .ico & .icns icons, forged on your device.

A free PNG to ICO converter and favicon generator that also makes macOS .icns files and browser-extension icons from PNG, JPG, SVG or WebP. Nothing is uploaded. Ever.

1 Load your artwork

  • Never uploaded. Your browser does all the work, so images stay on your device.
  • Works offline. Once loaded, Pureico keeps converting without a connection.
  • Free and open source. MIT licensed, with every line public on GitHub.

2 Preview

My Project
Inbox
your-site.com
My Project
Inbox
your-site.com

16 × 16, pixel for pixel

This is exactly what browsers show in a tab. Small details vanish at this size, so bold shapes read best.

3 Output

Formats
ICO sizes

4 Download

Drop an image to begin.

Questions, answered

Everything you need to know about making icons with Pureico.

Are my images uploaded anywhere?

No. Pureico reads and converts your images inside your browser, in a background Web Worker. There is no server that could receive them, and the page’s Content Security Policy blocks it from sending data anywhere. It even works with your internet connection switched off.

Which sizes should a favicon.ico include?

For a website, 16, 32 and 48 px cover browser tabs, bookmarks and Windows shortcuts: that is the Favicon preset. Windows desktop apps also need a 256 px image, which the Desktop app preset adds. Pureico stores the small sizes as classic bitmaps so even old software can read them. With the Favicon preset the file is named favicon.ico, ready for your site’s root folder; with larger sizes it is named icon.ico, the name Electron and Tauri apps look for.

How do I make an .icns file for a macOS app?

Turn on macOS .icns. Pureico packs Apple’s full set, from 16 to 1024 px including Retina sizes, into one file you can use with tools such as electron-builder’s mac.icon setting or PyInstaller’s --icon option for PySide6 and PyQt apps. It is named icon.icns, which electron-builder and Tauri use by default. For the sharpest result, start from a 1024 px image or an SVG.

Can Pureico round the corners of my icon?

Yes. Under Corners, choose Rounded and drag the radius slider (50% makes a circle), or choose macOS for Apple’s app icon shape with its standard margin and a soft shadow. If your logo has a transparent background, turn on Background to place it on a solid tile and set the padding around it.

Can I make icons for a Chrome or Firefox extension?

Yes. Turn on Browser extension PNGs to get 16, 32, 48 and 128 px PNG files plus a Manifest V3 snippet whose paths match the files in your download.

Why does my icon look blurry at 16 px?

A 16 × 16 icon has only 256 pixels, so fine details and thin lines disappear. Simplify the artwork, use bold shapes and strong contrast, and check both the dark and light tab previews before you download.

Can I convert several images at once?

Yes. Drop up to 20 images and Pureico creates a single zip file with a folder for each one.

Is Pureico free?

Yes: no sign-up, no watermarks and no ads. If it saves you time, you can support it on Ko-fi.