Convert x3f to fax

  1. Download and install the latest version of Filestar.

  2. Right click on one or more X3f file(s) on your desktop and select Convert with Filestar.

  3. Type convert to fax in the search box.

  4. Press Convert.

Or let an AI agent do it: filestarcli -i file.x3f -c "convert to fax" (how).

Let your AI agent convert X3F to FAX

Claude Code, Codex, Cursor and other agents can do this with Filestar. This skill runs in Filestar's cloud and needs a paid Filestar plan.

Install Filestar and add it to your agents:

npm install -g filestar
filestarcli agent install

Then ask your agent:

“Convert the X3F files in my Downloads folder to FAX”

Or run it yourself:

filestarcli -i file.x3f -c "convert to fax"

Runs in Filestar's cloud and needs a Filestar plan.

Can my AI agent convert X3F to FAX?

Yes, with a paid Filestar plan: this skill runs in Filestar's cloud. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.x3f -c "convert to fax".

Using Filestar With AI Agents → · Download SKILL.md

What is the difference between .x3f and .fax?

Extension
.x3f
.fax
Format
Binary
Binary
Category
Camera
Fax
Developer
SIGMA
ITU-T
Description
The X3F file format, also known as the SIGMA X3F Camera RAW File, is a proprietary image format developed by Sigma Corporation for storing raw image data captured by Sigma cameras equipped with the Foveon X3 sensor. Unlike standard JPEGs or TIFFs, X3F files contain unprocessed data from the camera's sensor, offering photographers greater flexibility in image editing.
This format is used to compress TIFF images when sending them via fax machines. This format helps reduce the data transmission time. Group 3 eliminates redundant data during compression in order to reduce file size. The standard 10:1 compression ratio may be increased to the user's preferences, but it can lead to a significant loss of image quality.
MIME Type
image/x-sigma-x3f
application/vnd.fax

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