Converting JPG to ICO gives you a larger file with identical content. It runs in your browser: nothing is uploaded, there is no queue and no size limit.
What changes when you convert JPG to ICO
- ICO is lossless, but it cannot restore what JPG already threw away. The file will be larger, often much larger, with exactly the same picture in it.
- ICO does not carry metadata: EXIF, GPS, camera settings and tags are dropped. That is a privacy feature as often as it is a loss.
When to convert, and when not to
Convert to ICO for favicons and Windows app icons. Windows icon and favicon container, several sizes in one file.
Keep JPG for photographs shared with anyone. The universal photo format. Lossy, no transparency, opens everywhere.
Do not convert to ICO hoping to improve quality: the detail JPG discarded is gone. Convert only when a tool insists on ICO.
How to convert JPG to ICO
- Drop your JPG file on the converter above, or click to choose. Several at once is fine.
- Check the options if you need them: resize, width (px), height (px), with both set, scale (%), never enlarge beyond the original.
- Click Convert, then Download. Nothing was sent anywhere, your browser did the work.
Questions
Is my JPG file uploaded?
No. The conversion runs in your browser with WebAssembly. There is no upload endpoint on this site. You can open your browser's Network tab, or go offline after the page loads, and it still works.
Is there a file size limit?
No fixed one. The limit is your device's memory: a large images file on a phone is slower than on a laptop, but nothing is rejected for being big.
Is it free?
Yes, without an account, without a daily cap and without a watermark. Your device does the computing, so there is no server bill to pass on.
Will the quality drop?
No. ICO is lossless: the images content is stored exactly.
Can I convert several files at once?
Yes. Drop them all; each is converted in turn and you can download them one by one or as a single ZIP.
Which engine does the conversion?
Image engine (jSquash: mozjpeg, oxipng, libwebp, libavif, libjxl), compiled to WebAssembly and running in your browser, on all your CPU cores when the browser allows it. First use downloads about 1.5 MB, cached afterwards.