Can I convert X3F to ICO on iPhone, Android, Mac or Windows?

Yes. ConvertPixels works in Safari, Chrome, Edge and Firefox on any device, so you can convert X3F to ICO on your phone or computer without installing an app.

Is there a free X3F to ICO converter with no sign-up?

Yes, this one. Converting X3F to ICO on ConvertPixels is free, with no sign-up, no watermark and no daily cap. Convert up to 30 files per batch, each up to 50 MB.

Can I convert X3F to ICO without losing quality?

Yes. ICO is a lossless format, so your converted file is pixel-for-pixel the same as the X3F. (It can't add back detail the original never had.)

Can I batch convert X3F to ICO?

Yes. Add up to 30 X3F files and convert them in one batch. You can even choose a different output format for individual files, then download them separately or together as a ZIP.

Is it safe to upload X3F files to ConvertPixels?

Yes. Uploads use an encrypted connection and are processed automatically - nobody views them. Your originals are deleted straight after conversion and the results within an hour, or instantly if you click "Delete from server now".

Convert

X3F to ICO Converter

Convert X3F images to ICO online in seconds - free, with no sign-up and no watermark. Batch convert up to 30 files and download them together as a ZIP.

Free
No sign-up
No watermark
Private by design

Choose filesor drag and drop files hereUp to 30 files · 50 MB each

Image Converter

How to use it

1
Drop your X3F files onto the converter
2
Press Convert to turn them into ICO
3
Download your ICO images one by one or as a ZIP

X3F to ICO

Why convert X3F to ICO?

The main difference: X3F is an unprocessed sensor data format, while ICO is a lossless format. ICO can have a transparent background, X3F can't.

Develop RAW into a ready-to-use photo

A X3F file holds the raw readings from the camera sensor, not a finished picture. Converting it to ICO applies the camera's colors and gives you a normal photo you can share, print or post right away.

Supports transparent backgrounds

ICO can hold a transparent background. Convert your image first, then cut out the background or place it on top of other designs.

Create a favicon or app icon

ICO is the icon format every browser and Windows understands. Convert a square X3F to get a favicon for your site or an icon for a desktop shortcut.

X3F vs ICO: what's the difference?

Property	X3F	ICO
Compression type	Unprocessed sensor data	Lossless (exact pixels, larger files)
Transparent background	No	Yes
Animation	No	No
Where it opens	None (needs a RAW editor)	All browsers as a site icon
Used for	Straight-from-camera photos for editing	Website favicons and Windows icons

What is an X3F (camera RAW) file?

X3F is the camera RAW format of Sigma - Sigma cameras with the Foveon sensor. Instead of a finished photo, a RAW file stores the unprocessed data straight from the camera's sensor.

That gives photographers maximum room to adjust exposure, white balance and color afterwards, but RAW files are large (often 20-60 MB) and need special software to view. Converting to JPG produces a normal photo you can share right away.

How to open an X3F (camera RAW) file

Sigma Photo Pro opens X3F files, and Adobe Lightroom, Photoshop (Camera Raw), Capture One, darktable and RawTherapee support them too. Mac Photos and Preview open most RAW formats; on Windows, the free Raw Image Extension adds support to the Photos app. Without any of these, convert X3F to JPG online.

Extension: .x3f
Made by: Sigma cameras
Contains: Unprocessed sensor data
Best for: Editing straight-from-camera photos

What is an ICO file?

ICO is the icon format of Microsoft Windows and the classic format for website favicons - the little image in a browser tab. One ICO file can hold several sizes (16 × 16, 32 × 32, 48 × 48 and more), so the icon looks sharp everywhere.

ICO supports transparency, so icons can have rounded or irregular shapes. Modern sites often add PNG and SVG favicons too, but favicon.ico is still the universal fallback.

How to open an ICO file

Windows shows ICO files in File Explorer and opens them in Photos; Mac Preview opens them too. GIMP and online editors can edit them. To make one, convert a square PNG - or use the Favicon Generator for a complete set.

Extension: .ico
Sizes: Several in one file (16-256 px)
Transparency: Yes
Best for: Favicons, Windows icons