Convert PNG to ICO Online
Turn any PNG into a Windows ICO icon directly in your browser. Transparency is preserved, oversized images are scaled to the 256-pixel ceiling, and no software is required.
How to Convert PNG to ICO in Three Steps
Upload your PNG icon, let the tool wrap it as a 32-bit ICO up to 256 pixels, then download the file.
Step 1
Upload PNG
Drop in the PNG you want to turn into an icon file.
Step 2
Auto Scale
Images larger than 256 pixels are resized automatically to fit the ICO limit.
Step 3
Download ICO
Save your .ico file with transparency intact and ready for Windows.
Why Convert PNG to ICO — Build Windows Icons And Favicons In Your Browser
ICO is the container Windows has used for icons since the early nineties: application icons, desktop shortcuts, folder icons and the favicon.ico file that browsers request from your site root. Historically an ICO held raw bitmap data, but modern ICO files are allowed to embed PNG-compressed images instead. That change is what makes a PNG such a natural source, and it is exactly what this converter produces. Embedding PNG rather than raw bitmap data also keeps the finished icon file small, which matters when it ships inside an application bundle.
Under the hood the process is simple and entirely local. Your PNG is drawn onto a canvas and encoded as a PNG at the working size, then wrapped in an ICO header describing a single thirty-two bit image entry. Because the embedded image is a thirty-two bit PNG, the alpha channel is retained, so transparent corners and soft edges survive instead of being filled with a solid color. Browsers and Windows both read PNG-based ICO entries natively, so there is no compatibility penalty for choosing this route.
One limit is imposed by the format rather than by this tool. An ICO entry cannot exceed 256 by 256 pixels, so the converter automatically scales any larger image down proportionally to fit that ceiling. You do not need to resize anything beforehand, but you should know that the output is a single-size ICO rather than a multi-resolution bundle containing separate 16, 32 and 48 pixel renders. Windows scales the single large image for smaller views quite happily in most situations.
A practical recommendation follows from that: start with a square PNG. Non-square sources produce non-square icons, and some renderers display those incorrectly or refuse them outright. Designing at 256 by 256 and letting the operating system scale down works well for most applications. If you need genuinely optimized artwork at each size, because small icons often benefit from simplified detail, generate separate PNGs at each resolution and assemble them with a dedicated multi-size icon tool. Simplified artwork genuinely does read better at sixteen pixels, which is why professional icon sets are usually drawn per size.
Typical uses include Windows application icons, favicon.ico files for websites, desktop and installer shortcuts, and Electron or Tauri app bundles. Because everything runs in your browser, no icon editor needs installing, nothing is uploaded to a server, there is no sign-up, and the .ico file you download carries no watermark. Batch conversion means a full icon set can be produced from a folder of PNGs in one pass.
Transparency Kept
The embedded 32-bit image keeps alpha, so icons sit cleanly on any background.
256 Pixel Ceiling
Larger PNGs are scaled down automatically to respect the ICO size limit.
PNG Inside ICO
Modern ICO files can embed PNG data, and that is exactly what is produced.
Square Recommended
Start with a square PNG so the icon renders correctly at every size.
Runs Locally
The whole conversion happens in your browser with nothing uploaded anywhere.
No Watermark
Your .ico file is clean and unbranded, ready to ship with your app.
FAQ
Frequently Asked Questions
ICO is the format Windows requires for application icons, desktop shortcuts and favicon.ico files. Modern ICO containers can embed PNG-compressed images rather than raw bitmaps, so a transparent PNG makes an ideal source and produces a smaller, cleaner icon file than older bitmap-based approaches.
Yes. The converter embeds a thirty-two bit PNG inside the ICO container, and that embedded image retains its full alpha channel. Transparent corners, rounded edges and soft shadows all survive, so your icon sits cleanly on any background without a visible white or black rectangle.
An ICO entry tops out at 256 by 256 pixels. If your source PNG is larger, the tool scales it down proportionally so it fits within that limit automatically. There is no need to resize the image yourself beforehand, and the aspect ratio is preserved during the downscale.
No, and this is worth knowing before you ship. The output is a single-size ICO containing one image. Windows and most browsers scale that entry well, but if you want artwork optimized at each size, generate separate PNGs and build a multi-resolution icon with a dedicated tool.
Yes, strongly. Icon renderers expect square images, and a non-square ICO may display incorrectly or be rejected outright by some applications. Crop your artwork to a square at 256 by 256 before converting, and you will avoid the most common cause of broken icon rendering.
Yes. Name the file favicon.ico and place it in your site root, or reference it explicitly with a link tag in your HTML. Browsers request favicon.ico automatically from the root directory, and a single 256 pixel entry scales down cleanly for tab and bookmark display.
No. The PNG is drawn onto a canvas and encoded entirely within your browser, then wrapped in an ICO header on your own device. No image data is transmitted anywhere, nothing is retained after you close the tab, and no account is needed.
Yes. There is no registration, no conversion limit, no file size cap beyond your device memory and no premium tier. Generate one favicon or a full set of application icons on identical terms, and every downloaded .ico file is clean with no watermark.
Yes. Add multiple PNG files and each is converted to its own ICO in the same run. Download the files individually or collect the whole set in a single ZIP archive, which is convenient when preparing icons for an application bundle or a favicon package.
Use a square image, ideally 256 by 256 pixels or larger. Anything above 256 pixels is scaled down proportionally to the ICO maximum, and the aspect ratio is preserved, so a square source avoids a stretched icon. Transparent PNGs stay transparent.