Opening an X3F File

The X3F file type is primarily associated with Sigma Photo Pro.

X3F	File extension: X3F
	File type:	image file

What is an X3F file?

X3F files mostly belong to Sigma Photo Pro. An X3F file is the raw image format used by Sigma cameras. It stores the unprocessed data from the camera sensor along with embedded metadata for exposure, white balance, and color profiles.
Files in this format hold the data needed for precise post-processing and are typically handled with software designed for raw image editing.
Key details sourced by FilExt.com include:

It contains raw sensor data.

It embeds camera-specific metadata.

It is optimized for detailed image adjustments.

It is best viewed and processed using Sigma Photo Pro.

FilExt.com tip: Using dedicated raw processing software ensures that the full quality and detail of the image is maintained, which is essential for later editing and correction.

How to open X3F files

You need a suitable software like Sigma Photo Pro to open an X3F file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your X3F file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a X3F file directly in the browser:. Just drag the file onto this browser window and drop it.

Online X3F File Viewer

Choose your .x3f file to view this image

or drag and drop it here

Online File Viewer

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How to convert X3F files to JPG, PDF, HTML, DOC, ...

1. Just click the "Choose your .x3f file to view this image" button on this page.
2. Your X3F file will then be displayed in the browser.
3. Now click on "Save as..." at the top of the page.
4. Then click the file format (e.g. PDF, JPG, DOCX, TXT, ...) you want.
5. Your file will be converted and downloaded.

X3F file format:

Each file has a definite file format, that is, how the stored data is arranged in the file. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. If the file extension or signature does not match the file format, errors will occur when opening or editing the file. When there is a problem with a file, the first step to solving it is to determine the file format. In the following you will find our evaluation of the X3F files:

The X3F file extension is not common and is mainly used by one program with a specific format. The two most common formats are as follows:

• 95% of all X3F files belong to Sigma - Foveon X3 raw picture. The contents of these files cannot be read by a human; only a computer program can interpret the data. X3F files are between 4 MB and 54 MB in size. The file type is very old but is also used today. The files contain the following words: FOVb and Auto. Such X3F files store data about sdim, sigma and merrill.

All other X3F files (5%) have different formats. You can get all the details of your X3F file by dragging it onto this page or by clicking the button "Choose your .x3f file to view this image" above.