Free DICOM Viewer

Yes. Unomed's free DICOM viewer can be used at no cost, with no licence fees and no account. You can open and view DICOM files directly in the browser.

When opened, your files initially stay on your device. Only after you confirm sharing through “View together” does UNOPACS anonymise metadata in the browser and upload images to Unomed servers. Text in image pixels and recognisable faces are not removed automatically. Review the images before uploading and follow your institution’s policies. After 35 minutes, access ends and the study is deleted.

The free online DICOM viewer is intended for viewing, teaching and second opinions. It is not certified as a medical device and is not intended for primary diagnosis. Clinical decisions are subject to your institution's guidelines and the judgement of qualified professionals.

When opening files locally, the viewer supports standard DICOM files and image series from all common modalities: X-ray, CT, MRI, ultrasound, PET, mammography and CBCT from dentistry, oral surgery and implantology. Uncompressed data, RLE, JPEG, JPEG Lossless, JPEG-LS and JPEG 2000 are supported, in 8 and 16 bit, greyscale or colour. If a study cannot be loaded, the cause is usually a vendor-specific format, an incomplete data set or a very large volume series. Shared UNOPACS sessions support suitable CT, MR, CR and DX files; unsuitable files are excluded.

No. Unomed's DICOM viewer runs directly in the browser, with no installation and no registration. You choose DICOM files and start straight away.

DICOM (Digital Imaging and Communications in Medicine) is the standard medical imaging devices use to store and exchange their images. Besides the image itself, a DICOM file contains its metadata: patient, examination, device, acquisition parameters and the position of the slice in space. The files often carry the extension .dcm, but frequently no extension at all, for example on patient CDs.

Copy the contents of the CD to your computer or insert it, and drag the whole folder into the viewer. It finds the DICOM files itself, including in subfolders, and skips DICOMDIR, the bundled Windows viewer and other extras. Alternatively, open the folder with the Open folder button.

Yes. Open and review the study, then choose “View together”. After the anonymised upload, invite others by link. Everyone follows the same image selection, zoom and windowing. Control can be handed to another participant, with no account or installation.

The shared session lasts 35 minutes from preparation and can be ended earlier. The uploaded study is then deleted and the invitation link stops working. Your local original files are kept. Unomed Cloud PACS provides long-term archiving.

Technically yes, but it is not advisable: e-mail is not encrypted well enough for patient data, and studies quickly become too large for an attachment. Unomed Cloud PACS shares studies encrypted via a link, including with recipients who have no Unomed account.

The free viewer does not convert files. For a presentation a screenshot without patient data is usually enough. For exporting whole studies to other formats, a PACS with an export function is the right tool.

No. The free viewer shows slices in two dimensions and scrolls through the stack. Multiplanar reconstruction and 3D are part of the viewer in Unomed Cloud PACS.

Best on desktop and laptop in modern browsers such as Chrome, Edge, Firefox or Safari. On tablets and smartphones, viewing, two-finger zoom and scrolling work; for large CT or MRI series we recommend a device with enough memory and a current browser version.

Common causes are files without image data (reports, structured data), vendor-specific formats or incomplete data sets. If a study comes from a device you use regularly, tell us: we will look at the format.