Tools / File Converter / ICO to JPEG 2000 Converter

ICO to JPEG 2000 Converter

Convert ICO files to JPEG 2000. Batch, free and without uploading.

This tool converts ICO files to JPEG 2000. ICO is the format for Windows icons and website favicons. It holds the same icon at several sizes, such as 16, 32, 48 and 256 pixels, in one file.

JPEG 2000 is used in archives, digital cinema and medical imaging. JPEG 2000 is lossy, and you choose the quality with the slider. For photos, 80–90% makes the file much smaller with a loss you won’t notice. JPEG 2000 has no transparency, so transparent areas in your ICO are filled with white or a colour you pick.

Conversion happens inside your browser; your files are never sent to a server.

How to use

1. Drag and drop your ICO files, paste them from the clipboard, fetch one from a link, or use "Choose files".
2. Set the quality and, if you like, a maximum size.
3. Press "Convert" and download the JPEG 2000 files one by one or as a ZIP.

Frequently asked questions

Will converting to JPEG 2000 reduce quality?

JPEG 2000 is lossy, but at 85–90% quality the difference isn’t visible. Lower quality means a smaller file.

How many files can I convert at once?

There is no limit. Select hundreds of files together and download the results as one ZIP.

Are my files uploaded anywhere?

No. Your ICO files are converted to JPEG 2000 inside your browser and never sent to a server.