Image
What is a .css file?
A .css file is a Cascading Style Sheet. This is an image format — a picture, drawing or graphic.
How to open a .css file
- GIMP (free) and IrfanView open a very wide range of image formats, including obsolete ones.
- XnView MP is the best bet for unusual or legacy image types.
- Your operating system's built-in viewer may work for mainstream formats.
The registry records this extension against Cascading Style Sheet, so software from that family is the most likely match.
How to convert a .css file
- Open it in GIMP or XnView and export as .png (lossless) or .jpg (smaller).
MIME type
When a .css file travels over the web, servers label it with this MIME type:
text/cssThe technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .css.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| Cascading Style Sheet | — | text/css | x-fmt/224 |