ICO Icon Generator - Free Online PNG to ICO Converter

Drag and drop an image here, or click to select a file

Supports PNG, JPG, GIF, BMP, WebP and more — max 10MB

Original Image

Square Image (Transparent)

Select ICO output size:

16×16

32×32

48×48

64×64

128×128

256×256

Download Square PNG (Transparent) Download ICO File

Processing image...

Key Features

Completely Free

No payment, no registration, no usage limits. All features are free for everyone to use immediately.

Browser-Based, Privacy Safe

All image processing happens entirely in your browser. Files are never uploaded to any server. Your images never leave your device.

Multiple Sizes Supported

Supports standard ICO sizes: 16×16, 32×32, 48×48, 64×64, 128×128, and 256×256 — covering all use cases.

Transparent Background

Automatically preserves transparent backgrounds when converting to square format. Both ICO and PNG outputs support full alpha transparency.

Auto Center Crop

Automatically centers and crops any aspect ratio image into a perfect square, keeping the content intact for clean, professional icons.

Instant Preview

After uploading, instantly see a side-by-side preview of the original and processed square image before downloading.

How to Use the ICO Icon Generator

Upload Your Image

Click "Choose Image" or drag and drop your image into the upload area. Supports PNG, JPG, GIF, BMP, WebP and other common formats. Max file size is 10MB.

Preview the Result

The tool automatically converts your image to a square with a transparent background. A checkerboard pattern shows the transparent areas so you can verify the result.

Choose ICO Size

Select the ICO size from 16×16 to 256×256. Favicons typically use 16×16 or 32×32. For application icons, 48×48 or larger is recommended.

Download ICO or PNG

Click "Download ICO File" to get the standard ICO format, or "Download Square PNG" to get the transparent square image for further editing.

Frequently Asked Questions

What is the ICO format?

ICO (Icon) is the icon format used by Windows, with the file extension .ico. It can contain multiple image sizes so the operating system can automatically pick the most appropriate size for each display context. ICO is also widely used for website favicons (the small icon shown in browser tabs).

What are the common uses of ICO files?

ICO files are mainly used for: website favicons (shown in browser tabs and bookmarks), Windows desktop and application icons, custom Windows folder icons, and executable (.exe) program icons.

What image formats can I upload?

This tool supports all image formats that browsers can display, including PNG, JPG/JPEG, GIF, BMP, WebP, SVG, and more. PNG is recommended as the source image for the best transparent background results.

What is the maximum image size supported?

This tool supports image files up to 10MB. There is no strict resolution limit, but using a source image of at least 256×256 is recommended so your ICO retains sharp detail when scaled down.

Is this tool free? Are there usage limits?

Completely free with no usage limits. No account registration or email address required. You can use this tool as many times as you like.

Will my images be uploaded to a server? Is it safe?

No. All image processing is done entirely in your browser using the HTML5 Canvas API and FileReader API. Your images are never sent to any server. When you close the tab, all data is immediately cleared.

How do I create an ICO file with multiple sizes?

Currently this tool generates a single-size ICO per download. If you need a multi-size ICO (standard favicons often include 16×16 and 32×32), you can download each size separately and combine them with an ICO merge tool, or simply use 32×32 which satisfies most requirements.

Will the converted image lose quality?

The conversion uses a high-quality bilinear interpolation scaling algorithm to preserve maximum detail when resizing. For best results, use a source image of at least 256×256 pixels to avoid quality loss from upscaling.

Free Online ICO Icon Generator