DICOM file viewer online — open .dcm studies in your browser

DCM file viewer: what opens .dcm files?

.dcm files are usually one slice or object in a larger DICOM study. A proper viewer loads the whole study so you can scroll series. DICOM Reader accepts the entire folder (all related files), not a single screenshot, so CT, MRI, and X-ray series display the way they were acquired.

What is a DICOM file?

DICOM (Digital Imaging and Communications in Medicine) is the universal standard format for medical imaging. When a hospital or clinic gives you images on a CD, USB drive, or patient portal download, they are almost always DICOM files — typically a folder of files ending in .dcm, or files with no extension at all that open with specialized software.

DICOM files contain not just the image pixels, but also embedded metadata: patient details, imaging parameters, the modality (CT, MRI, X-ray, etc.), acquisition date, and more. DICOM Reader uses all of this context when generating your report.

Supported imaging modalities

DICOM Reader accepts any standard DICOM study. Commonly uploaded modality types include:

If your study is a standards-compliant DICOM study, DICOM Reader can read it.

What makes DICOM Reader different from other DICOM viewers?

Standard DICOM viewers let you scroll through images. DICOM Reader does that and generates an AI report — so instead of squinting at grayscale images and trying to figure out what you're looking at, you get:

• Plain-English findings — what the AI observed, organized by region, in language you can follow
• Overall impressions — a concise summary of the most notable observations from the study
• Frame-level citations — every finding links back to the exact DICOM frame where it was seen
• Follow-up chat — ask any question about your results and get answers grounded in your actual images
• No software to install — everything runs in your browser; your account saves reports for later

Free DICOM viewer vs credits for AI reports

Many people look for a free DICOM viewer to open discs or downloads. DICOM Reader lets you sign up without a credit card and start in the product; exact free-tier limits and when AI analysis uses credits are on Pricing. There is no subscription for the standard bundle — you buy report credits when you need them.

How this fits next to other DICOM viewers

Desktop tools (for example MicroDicom, Weasis, Horos) and browser viewers are built mainly for scrolling and measuring images. DICOM Reader is a patient-focused web app for plain-English, AI-assisted informational summaries with citations and chat — a different job. For a full map of the landscape, see DICOM viewers compared.

Understand your official report, not just the images

Opening the scan is only half the job. If you also want help with jargon from your radiology report or questions before your visit, use the Understand my scan hub and AI radiology report overview.

How to open your DICOM files

Getting DICOM files is easier than most people expect:

From a CD or DVD: Insert the disc, open it in Finder (Mac) or File Explorer (Windows), and look for a folder of image files or a folder named "DICOM" or "IMAGES". Upload that entire folder to DICOM Reader.

From a patient portal: Many hospital portals let you download your imaging studies as a ZIP file. Unzip it, then drag the DICOM folder into DICOM Reader.

From a USB drive: Copy the DICOM folder to your computer or upload it directly from the drive.

Once uploaded, the AI processes every frame automatically. You do not need to configure anything.

Common questions