FreeNo uploadNo sign-upBatch
JPG to ICO Converter
Create a multi-size favicon.ico or Windows icon from JPG.
Drop JPG files here
batch and mixed formats welcome
- Private by design. Converted inside your browser.
- Instant. No upload queue, no waiting.
- Unlimited. Convert hundreds of files, download as ZIP.
How to convert JPG to ICO
Add your JPG files
Drop them on the converter, click Choose files or paste from the clipboard. You can add as many as you like.
Adjust the settings
Choose which sizes to include. All six are selected by default; sizes larger than your image are skipped.
Download your ICO files
Each file converts automatically. Save files one by one or all at once as a ZIP.
Why convert JPG to ICO?
JPG is the most widely supported photo format. It uses adjustable lossy compression, so photos stay small enough to share, upload and email.
An ICO file bundles several icon sizes, so browsers and Windows can pick the sharpest one for tabs, bookmarks and shortcuts.
JPG vs ICO
| JPGJPEG image | ICOWindows icon | |
|---|---|---|
| Type | Raster photo | Icon container with several sizes |
| Compression | Lossy, adjustable quality | PNG or BMP inside |
| Transparency | Not supported | Supported |
| Animation | Not supported | Not supported |
| Support | Every device, browser, app and website | Browsers (favicon), Windows |
| Best for | Photos you need to share, upload or print | Favicons and Windows icons |
Frequently asked questions
Which sizes should a favicon.ico contain?
16, 32 and 48 px cover browser tabs and Windows shortcuts. Adding 64, 128 and 256 px keeps the icon sharp in large Windows views.
Can I convert many JPG files at once?
Yes. Add as many files as you like; each one converts automatically and you can download them all as a ZIP.
Are my files uploaded to a server?
No. formatmath converts files with code that runs inside your browser. Your files are never uploaded, stored or seen by us.
Is it free?
Yes. There is no watermark and no daily limit. An account is optional and only keeps a history of your conversions.