PNG to ICO Converter: Core Features and Principles

When generating a favicon for a website or creating a shortcut icon for a Windows desktop, you often need to convert PNG images to ICO format and include multiple standard sizes. This tool instantly converts uploaded PNG images into standard ICO icon files. It automatically bundles six sizes—16x16, 32x32, 48x48, 64x64, 128x128, and 256x256—into a single .ico file, ensuring crisp display across different resolutions and scenarios. The entire conversion process is completed locally in your browser without uploading to a server, making it secure and efficient.

Why Choose Our PNG to ICO Converter?

All-in-One Multi-Size Bundling: Generate a composite ICO file containing 6 standard sizes at once, perfectly tailored for website favicons and Windows desktop shortcut icons.
100% Browser-Based Processing: Your images never leave your device, ensuring complete data privacy with no file size or usage limits.
Zero Learning Curve: Simply upload your PNG image and get instant results. No software installation or account registration required.

How to Use

Prepare a PNG image. A square aspect ratio is recommended for the best icon display.
Click or drag and drop your image into the upload area. PNG files of any resolution are supported.
Click the "Generate ICO" button. Your browser will automatically encode and generate an ICO file containing 16, 32, 48, 64, 128, and 256-pixel sizes.
Download the generated .ico file and use it directly for your website favicon or custom Windows desktop icons.

Frequently Asked Questions (FAQ)

What sizes are included in the generated ICO file?
It will always include six pixel sizes: 16x16, 32x32, 48x48, 64x64, 128x128, and 256x256, ensuring a crisp appearance across all display scenarios.
Does the conversion require an internet connection? Will my images be saved?
The process is handled entirely within your local browser and does not require an active internet connection. Your images are never uploaded to any servers, and all data is immediately cleared after conversion to protect your privacy.

Important Notes

This tool only supports PNG images; other formats like JPG or GIF cannot be used. Uploaded PNG images are never uploaded or stored, as everything is processed locally. If the original image is not square, it will be cropped from the center to a square during conversion to prevent distortion. We recommend cropping your image to a square beforehand for the best results. Because the ICO file contains multiple sizes simultaneously, the resulting file will be larger than the original PNG, which is completely normal. Currently, this tool can only convert one image at a time. If you need multiple icons, please repeat the process.

Technical Notes & Best Practices

The ICO format is a special container file that can hold multiple images of different sizes and color depths. Windows operating systems and modern browsers automatically select the most appropriate size from it for the current display scenario. All sizes within the ICO generated by this tool use 32-bit color (including an Alpha transparency channel), perfectly preserving the transparent edges of your original PNG. For website favicons, we recommend renaming the generated file to favicon.ico, placing it in your website's root directory, and pairing it with the HTML tag <link rel='icon' href='/favicon.ico' sizes='any' /> to ensure maximum compatibility. We recommend using an input PNG with a resolution of at least 256x256 pixels; otherwise, the larger icon sizes may appear blurry.