Convert to ICO — Free
Files convert instantly in your browser — 100% private, any file size, no account needed.
Drop your ICO file here
or click to browse — any size
Conversion runs entirely in your browser — your file never leaves your device.
How to convert to ICO
Convert your images to ICO format quickly and easily with BoltConverter, a free online tool. Create favicon files or Windows icons directly from your browser.
Our converter uses WebAssembly to process your files entirely on your device. This means your images never leave your computer, ensuring complete privacy and security for your data.
Select Your File
Choose the image file you want to convert to ICO from your device.
Start Conversion
Click the "Convert" button to begin the in-browser conversion process.
Wait Briefly
The tool will process your file locally in your browser.
Download Your ICO
Once complete, download your new ICO file directly to your device.
Frequently asked questions
Is BoltConverter free to use?
Yes, BoltConverter is a completely free online tool for all your conversion needs.
Do my files get uploaded to a server?
No, your files are never uploaded. All conversions happen directly in your browser using WebAssembly, keeping your data private.
Is there a file size limit?
Since files are processed locally in your browser, there is no server-imposed file size limit.
What about the output quality of the ICO file?
BoltConverter is designed to produce high-quality ICO files, maintaining clarity and detail from your original image.
Can I convert multiple files to ICO at once?
Yes, you can convert multiple files to ICO format, either one by one or in a batch, depending on the tool's interface.