DICOM VIEWER FOR MAC · RESEARCH & EDUCATION
DICOM viewer for Mac. Open CT and MRI, then explore in 3D.
Open CT and MRI studies from a folder or DICOMDIR disc on your Mac, without uploading the images. Compare series, explore a 2×2 MPR and 3D layout, play cine runs and edit DICOM tags. Apple silicon and macOS 13 or later; Intel Macs are not supported.
No card required. After the trial: five-minute sessions, or Basic or Professional.
Apple silicon
macOS 13 or later · M-series Macs
MPR + 3D
Explore planes and rotate a volume
Editable metadata
Inspect tags and save supported values
Open DICOM files on your Mac
Install the signed, notarized macOS PKG, then open OmniDICOM DICOM Viewer from Applications. Choose File → Open Folder… or drag a DICOM folder into the viewer. Select a series in the left-hand list and scroll through its images.
When copying a study from a disc, keep its folder structure, including DICOMDIR and image subfolders. A Windows-only viewer supplied on the disc cannot run as a Mac app, but its accompanying DICOM images are a separate part of the study. Files do not always have a .dcm extension.
See CT and MRI in more than one plane
For a suitable volume series, the 2×2 MPR layout brings axial, coronal and sagittal views together with a 3D view. Move through the reslices, adjust window and level, then inspect the volume from another angle.
MPR depends on the source study: a single image or a time sequence is not automatically a reconstructable CT or MRI volume. Geometry, slice spacing and the available images affect the result.
Review motion and edit the details
Play multi-frame angiography and ultrasound sequences, pause on a frame and adjust playback speed. For compatible angiographic series, DSA tools add mask selection and pixel-shift alignment.
The DICOM Meta panel lets you inspect tags and edit supported top-level values. This is useful for correcting research labels or series descriptions. Saving metadata writes to the selected files, so work on a copy when preserving originals matters.
Check compatibility before downloading
The current Mac build requires Apple silicon and macOS 13 or later. Intel Macs are not supported by this installer. A separate installer is available for 64-bit Windows 10 and 11. In Professional, Denoise for CT, MR and X-ray needs macOS 14 or later on a Mac.
Study viewing runs locally. An internet connection is needed to start the trial and for licensing and update services; PACS transfers use the servers you configure. The desktop viewer does not require uploading a study to the OmniDICOM website.
Common questions
Is this a free Mac DICOM viewer?
The download is free and every computer gets a 14-day Professional trial, no card required. After the trial, OmniDICOM keeps opening studies in five-minute sessions and its exports carry a watermark. Basic (US$10 a month per computer) removes those limits; Professional (US$45 a month per computer) adds Denoise, Process and Analyze.
Can I open a .dcm file from Finder?
Yes, from 1.1.5. Right-click a .dcm or .dicom file and choose Open With, then OmniDICOM DICOM Viewer. Installing leaves your default viewer as it is; to make double-clicks open OmniDICOM, choose Get Info, pick it under Open with and click Change All. For a whole CT or MRI study, open its folder.
Can I put the images into PowerPoint slides?
Yes. Copy Image (⌘C) copies the active panel and Copy Layout (Shift+C) copies every visible panel as one labelled picture, drawn at 2400 or 3600 pixels on the long side, ready to paste into PowerPoint slides. Patient identifiers are left out by default. From 1.1.6, Save as PowerPoint (.pptx)… also saves the image or the layout as slides, with the measurements listed beside each picture.
Is there a Windows version?
Yes. The same app, with the same tools and menus, runs on 64-bit Windows 10 and 11, from a signed installer or the Microsoft Store. One licence covers one computer.
Do I need Professional for MPR or 3D?
No. MPR, 3D volume rendering, cine playback, DSA subtraction and metadata editing are included in Basic. Professional adds Denoise (CT, MR and X-ray), Process and Analyze.
Can I use it for diagnosis?
No. OmniDICOM is for research and education. It is not a medical device and is not intended for diagnosis or clinical decision-making.
Watch: how to open CT and MRI on Mac →
START WITH YOUR OWN STUDY
Try the complete viewer.
The 14-day Professional trial starts on first launch with an internet connection. Basic is US$10/month or US$99/year per computer. After the trial, studies keep opening in five-minute sessions and exports carry a watermark until you choose Basic or Professional.
OmniDICOM runs on Mac and Windows computers. Open this page on your computer to download it. Meanwhile, read the how-to guides or watch OmniDICOM at work on YouTube.
macOS 13+ · Apple silicon · signed, notarized PKG
Windows 10/11 · 64-bit · signed EXE