Images
What is a DICOM file?
DICOM (Digital Imaging and Communications in Medicine) is the standard image format used by medical scanners like MRI, CT, and X-ray machines. It stores the scan losslessly, so no image quality is lost, and it bundles in patient and equipment metadata alongside the pixels. The catch is that regular photo viewers can't open it without special software.
- Extension
- .dcm
- Type
- Images
- Typically
- Medical scans (MRI, CT, X-ray)
- Transparency
- None
- Metadata
- Carries EXIF
Why DICOM exists
DICOM comes out of hospitals and imaging clinics, not cameras or phones. When you get an MRI, CT, or X-ray, the machine writes the scan as one or more DICOM files, and that's the format radiologists, hospital systems, and imaging software are built around.
Under the hood, a DICOM file is really two things stitched together: the actual image data, stored without any loss in quality, and a large header of metadata describing the scan, the equipment, and often the patient. That metadata is a core part of the format, not an afterthought.
Most people run into DICOM when they're handed a scan on a disc or a download link and need to actually look at it, share it with another doctor, or drop it into a report. Standard image viewers don't recognize the file, so it needs converting to something like a JPG or PNG first.
The trade-offs
Strengths
- Lossless, so the scan keeps its full diagnostic detail
- Carries rich context: equipment settings, scan date, patient info
- The standard format across virtually all medical imaging hardware
Watch-outs
- Won't open in ordinary photo viewers or browsers
- Large file sizes compared to compressed everyday image formats
- Its metadata can include sensitive patient details you may not want to pass along
A note on privacy
A DICOM file's metadata can include patient name, birth date, and other identifying details alongside the scan itself. Uploading it to an online converter sends that medical information to a stranger's server. Converting it on your own computer keeps the scan and everything attached to it on your machine.
Convert a DICOM file
- Convert DICOM to JPG
- Convert DICOM to PNG
- Convert DICOM to WebP
- Convert DICOM to AVIF
- Convert DICOM to GIF
- Convert DICOM to TIFF
- Convert DICOM to BMP
- Convert DICOM to PDF
Questions
How do I open a DICOM file?
You need software built to read DICOM, since regular image viewers won't recognize it. Many people instead convert it to a JPG or PNG so it opens anywhere.
Is DICOM better than JPG?
For medical use, yes: DICOM keeps the scan lossless and carries clinical metadata a JPG can't hold. For everyday viewing and sharing, no: JPG opens on any device without extra software.
Why does my scan come as a DICOM file?
It's the standard output format for MRI, CT, and X-ray machines, so hospitals and imaging centers hand scans over exactly as the equipment saved them.
Can I convert a DICOM file without uploading it?
Yes. A desktop app like Morphjet converts DICOM on your own computer, so the scan and any patient details in it never leave your machine.
Morphjet opens and converts DICOM, one of 2,748 conversions it runs on your own computer. Available now.
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