Convert PNG to ICO Online
Yes. You can convert PNG images into multi-resolution Windows ICO icon files in your browser without uploading your files. Our hand-written ICO generator embeds 16x16 up to 256x256 pixel sizes with alpha transparency.
Browse files or drag & drop
Files never leave your browser. Zero cloud uploads.
Supports JPG, PNG, WebP, GIF, BMP, AVIF, or SVGYour files are processed in your browser and are not uploaded by our code. You can confirm this in your browser's Network tab. Third-party ad scripts load on the page, outside the tool area, and are not given your files.
How does it work locally?
Upload Source PNG
Select a square PNG image (ideally 256x256 or higher). The image stays strictly in local memory.
Generate Multi-Resolution Layers
The tool scales the icon to 16, 32, 48, 64, 128, and 256 pixel sizes, preserving transparent pixels.
Download .ICO File
Download your compiled favicon.ico or desktop icon file ready for instant deployment.
Tips for Best Results
- Starting with a 256x256 or 512x512 square PNG ensures all downscaled icon resolutions remain sharp.
- Full 32-bit RGBA transparency is maintained across all embedded icon layers.
- The resulting file can be named favicon.ico and placed directly in your website public root directory.
Format Comparison
| Icon Size | Color Depth | Alpha Support | Primary Operating Environment |
|---|---|---|---|
| 16x16 px | 32-bit RGBA | Yes | Browser address bars and classic desktop tabs |
| 32x32 px | 32-bit RGBA | Yes | Standard Windows taskbar and desktop shortcuts |
| 48x48 px | 32-bit RGBA | Yes | Windows file explorer medium icon view |
| 64x64 px | 32-bit RGBA | Yes | High-DPI desktop displays |
| 128x128 px | 32-bit RGBA | Yes | Windows large icon view |
| 256x256 px | 32-bit RGBA | Yes | Retina displays and extra-large application icons |
Limits and Technical Specifications
- Maximum input image size: 40 MB.
- Square aspect ratios are recommended; non-square images will be scaled to square dimensions.
Frequently Asked Questions
What resolutions are included in the ICO file?
Our hand-written ICO generator packs 16x16, 32x32, 48x48, 64x64, 128x128, and 256x256 pixel resolutions into a single file.
Is alpha transparency preserved?
Yes. Modern 32-bit RGBA PNG data is embedded into the icon directory, preserving transparent backgrounds.
Where can I use this ICO file?
The resulting ICO file can be used as a website favicon.ico or as an application icon in Windows.
What source image works best?
A square PNG image with at least 256x256 pixel resolution provides the sharpest downscaled icon sizes.
Are my icons uploaded to any server?
No. The binary ICO file is compiled directly in your browser memory.
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