Image / Icons
Image to ICO Converter
Turn a PNG, JPG, WebP, or SVG into a Windows .ico file holding several sizes, from 16 × 16 to 256 × 256, with transparency kept.
Image to ICO Converter: Each size is drawn from the original with high-quality scaling and stored as a PNG inside one ICO container, which Windows Vista and later and every current browser read. Fit keeps the whole picture with transparent edges; fill crops it to a square. Runs 100% locally in your browser with zero server file uploads.
- Category
- Image tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
Click, drag and drop, or paste · stays on this device
An ICO file holds several sizes of the same icon, and Windows and browsers pick the best one for each place. Each size is stored as a PNG inside the file, which keeps transparency and works in Windows Vista and later and in every current browser. The image never leaves your device.
What an ICO file contains
An ICO is a small directory followed by the images: for each size, its width and height (0 meaning 256), colour depth, and where its data starts. Windows has read PNG data inside ICO files since Vista, which is how this converter keeps full transparency at every size.
For a complete website set, with the PNG sizes and a web manifest, use the favicon converter.
Where each size is used
Browsers show the 16 × 16 icon in tabs and 32 × 32 on high-resolution screens; Windows uses 16, 24, and 32 in lists and the taskbar, 48 for medium desktop icons, and 256 for large ones. Including every size you need lets each place use a sharp image instead of scaling one.
How to use it
- Choose an image, ideally square and at least 256 × 256.
- Pick the sizes to include and whether to fit or fill the square.
- Download the .ico file.
Privacy & limitations
The image is converted in your browser and never uploaded.
Related tools
Frequently asked questions
Which sizes should I include?
For a website favicon, 16, 32, and 48; for a Windows program or shortcut, add 256. The default covers both.
Will transparency survive?
Yes: each size is stored as a PNG with its alpha channel.
Should I use ICO for my website?
Modern browsers also accept PNG and SVG favicons, but a favicon.ico at the site root is still the one every browser and tool looks for; the favicon converter builds the whole set.
Free tool · runs in your browser · no account required