How do I convert JPG to ICO?

Add your JPG file to the upload area above, then press Convert. The ICO file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to ICO reduce quality?

No. ICO is a lossless format, so the conversion preserves exactly what is in your JPG file. Note that it cannot recover detail that was already discarded when the JPG was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 120 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

ImageLosslessRuns in your browser

JPG to ICO Converter

Turn JPG files into ICO in a couple of clicks. The universal lossy photo format. Multi-resolution icon container for favicons and apps. The conversion is lossless — every pixel, sample or byte in the source is preserved.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

JPG files (.jpg, .jpeg, .jpe, .jfif) · up to 120 MB each

or paste files from your clipboard

Ready when you are

Drop a JPG file above and FileTools360 will turn it into ICO — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your JPG files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control dimensions, rotation and metadata removal.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

JPG and ICO explained

JPEG is a lossy image format designed for photographs. It works by discarding detail the human eye is least likely to notice, particularly in colour and in smooth gradients, which is why it compresses photos far better than it compresses text or line art.

ICO is a container that holds several versions of the same icon at different sizes, so the operating system or browser can pick the one that fits. It is capped at 256×256 pixels.

Where JPG files come from: Digital cameras, phone screenshots on Android, and essentially every photo on the pre-2015 web.
Where ICO is used: Website favicons and Windows application icons.

JPG vs ICO

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

JPG compared with ICO
Property	Source	Target
Compression	Lossy	Lossy or lossless
Transparency	No	Yes
Animation	No	No
Introduced	1992	1985
Browser support	Opens everywhere — every browser, OS and device.	Browsers and Windows. Sizes are capped at 256×256.

JPG is stronger at: Opens on literally every device, browser and application ever made. Small files for photographic content. Adjustable quality, so you control the size/fidelity trade-off.
ICO is stronger at: Holds multiple resolutions in one file. The format browsers expect for favicon.ico. Supports transparency.

Why convert JPG to ICO?

People make this switch when they run into the limits of JPG: the image has transparency, sharp edges, text, or you plan to edit and re-save it repeatedly. ICO is the better fit when you are making a favicon or a Windows application icon.

JPG limitations that prompt the switch: No transparency — there is no alpha channel at all. Visible artefacts around sharp edges and text. Every re-save degrades the image further (generation loss).
What you give up: Capped at 256×256. Not a general-purpose image format.

Does converting JPG to ICO reduce quality?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.

Saving a JPEG at 100% quality is still lossy — it is a large file that has been through the same discarding process, not a lossless copy.