Files with the .ORF extension contain raw, uncompressed images captured by the sensor of an Olympus-brand digital camera. The form of the ORF file format can depend on the model of the camera, which is why not all software supports all types of ORF files – thus, before installing the chosen software, one should always check, whether the correct camera model is, indeed, supported.

Since they contain raw images, ORF files allow for a delayed “generation” of images – which allows the user to edit parameters such as exposure, white balance, and temperature using the right editing software for post-production.