Convert PNG to ICO Online
Turn PNG files into ICO directly in your browser using ConverterUp. There is no upload, no waiting in a queue, and no account required — your files stay on your device while WebAssembly does the work locally. Adjust quality and dimensions where supported, then download the result. The output keeps the visual fidelity you'd expect from a desktop app while running entirely in the browser tab.
Convert PNG to ICO nowHow to convert PNG to ICO
Open the converter
Click the button to open the PNG to ICO tool. It loads instantly — no install, no signup.
Drop your PNG file
Drag your PNG file into the upload area or click to browse. The file stays in your browser memory only.
Download ICO
The conversion runs locally and finishes in seconds. Click download to save the ICO file to your device.
PNG vs ICO at a glance
Key technical differences between the two formats, so you know what to expect before converting.
| Feature | PNG | ICO |
|---|---|---|
| Type | Raster image | Raster image |
| Compression | Lossless | Lossless |
| Transparency | Full alpha channel | Full alpha channel |
| Animation | — | No |
| Bit depth | 1–16 bit/channel | — |
| Browser support | All browsers | All browsers |
| Extensions | .png | .ico |
| MIME type | image/png | image/vnd.microsoft.icon |
| Introduced | 1996 · PNG Development Group / W3C | Microsoft |
What changes when you convert PNG to ICO
- Both formats are lossless, so the pixels in the ICO file are identical to the PNG source. Only the container and compression method change.
- An ICO file can bundle several sizes (16×16, 32×32, 48×48 and more) in one file, which is what browsers and Windows expect from a favicon or app icon.
- Transparency is preserved: ICO supports an alpha channel, so transparent backgrounds from PNG stay transparent.
About PNG
PNG (Portable Network Graphics) is a lossless raster format created as a patent-free replacement for GIF. It supports full alpha transparency and up to 16 bits per channel.
- Best for
- Screenshots, logos, UI graphics, diagrams and any image that needs a transparent background or pixel-perfect edges.
- Strengths
- Lossless quality, full transparency, opens everywhere.
- Limitations
- Photos produce large files compared with JPG, WebP or AVIF.
About ICO
ICO is the Windows icon format. One .ico file can hold several images at different sizes, stored as BMP or PNG data, so the system can pick the best one for each context.
- Best for
- Website favicons, Windows application and shortcut icons.
- Strengths
- Multiple sizes in one file, transparency, recognised by every browser as a favicon.
- Limitations
- Not suitable for general images or photos.
Frequently asked questions
Is the PNG to ICO conversion really free?
Yes. ConverterUp is fully free, with no signup, no watermarks, and no daily quota for the PNG to ICO converter. We support the project through unobtrusive ads.
Are my PNG files uploaded to a server?
No. Conversion runs in your browser using WebAssembly. The PNG bytes never leave your device, and we have no upload endpoint at all.
What is the maximum file size?
For PNG input, the soft cap is 50 MB for images and 500 MB for video. Practical performance depends on your device's RAM.
Does converting PNG to ICO reduce quality?
No. Both formats are lossless, so every pixel is preserved exactly.
Does ICO keep the transparent background of my PNG?
Yes. ICO supports a full alpha channel, so transparency from the PNG file is preserved.
Related guide
PNG vs JPG vs WebP: Which Format to Use WhenRelated conversions
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