ORF Converter
ORF is Olympus's raw format, written by the OM-D and PEN bodies and by OM System's current range — the name changed when Olympus sold the camera division in 2021, but the format did not. Micro Four Thirds sensors keep the files smaller than full-frame raw, and just as unreadable outside a raw editor.
ORF at a glance
| Full name | Olympus RAW Format |
|---|---|
| Extension | .orf |
| MIME type | image/x-olympus-orf |
| Compression | Lossless |
| Transparency | No |
| Animation | No |
| Colours | 12-bit per channel |
| Browser support | None — RAW editors only |
| Typical use | Olympus and OM System Micro Four Thirds cameras |
| Introduced | 2002 |
Convert ORF to another format
ORF questions
How do I open an ORF file?
OM System Workspace, formerly Olympus Workspace, is the free option. Lightroom, Camera Raw, Capture One, darktable and RawTherapee all read ORF as well. Nothing outside a raw editor will display it, so converting is the answer for sharing.
Are ORF files smaller than full-frame raw files?
Usually, because Micro Four Thirds sensors have fewer pixels over a smaller area. An ORF from a 20-megapixel OM-D body typically lands around 17 to 22 MB against 40 MB or more for a high-resolution full-frame raw.
Did ORF change when Olympus became OM System?
No. Olympus sold the camera division in 2021 and the brand on the body changed, but the format did not: an OM-1 writes ORF exactly as an OM-D E-M1 did, and the same software reads both.
Do ORF files keep the in-camera art filters?
The filter is recorded as a setting rather than applied to the sensor data, so a raw editor shows the unfiltered frame by default. Only the camera JPG has the effect baked in — which is the point of shooting raw if you might want it removed.