A free DICOM viewer for Mac, Windows and the browser.
dcmage is a free DICOM viewer that runs as a native app on macOS and Windows 11, from the Mac App Store and the Microsoft Store, and in any modern browser without an install. It opens CT, MR and other DICOM series from your own disk and shows them slice by slice, in synchronized axial, sagittal and coronal planes, or as a 3D volume rendering. The same app edits tags and de-identifies files. It is for research and technical review, not diagnosis.
Three synchronized planes through the volume.
View a series slice by slice, in axial, sagittal and coronal planes with synchronized crosshairs, or as a 3D volume rendering. Move one crosshair and every plane follows. Window/level, zoom and measure in the same view.
- Synchronized crosshairs one click locates the same voxel in every plane.
- Slab projection MIP, MinIP or average across a slab thickness set in millimetres.
- Oblique MPR drag the crosshair to rotate the planes, and reset them to orthogonal in one step.
- 3D volume rendering a GPU ray-cast of the loaded volume that you rotate with the mouse.
- Cine playback play ultrasound or angiography loops at the stored frame rate, from 0.25× to 4×.
- RT dose overlay an RT Dose as a colour wash in Gy over its planning CT or MR, with isodose lines.
- Window/level right-drag to adjust W/L; left-drag to pan; scroll to zoom.
- Measurement tools distance, angle, ROI statistics, pixel probe, labelled arrows and Cobb angle.
How it works
- 01
Open your files
Drop DICOM files or a folder into the web app, or open them in the Mac app. The files are read on your machine.
- 02
Open 3D MPR
Switch to the three-plane layout to view axial, sagittal and coronal reconstructions together, or to the 3D view for a volume rendering.
- 03
Navigate the same location
Move a crosshair in one plane and the other views follow the same voxel.
- 04
Inspect and measure
Adjust window and level, pan and zoom, play multi-frame loops as cine, and measure during technical review.
Checks that still need judgment
- MPR depends on usable image geometry and slice spacing. Incomplete or irregular series may not reconstruct as expected.
- The viewer is for research and technical review, not primary diagnostic interpretation.
- Dedicated Mac viewers such as Horos and OsiriX offer more reading tools, including curved MPR and PET-CT fusion. dcmage puts viewing, tag editing and de-identification in one free app.