Source: https://openmyscan.com/en/dicom-viewer // Free DICOM viewer for patients. Online, no download # Free Online DICOM Viewer — No Download, No Upload Open any DICOM folder in your browser. MRI, CT, X-ray, and ultrasound are all supported. Files stay on your device. - Free forever - No upload, no install - Viewer needs a 1200px-wide window ## What is DICOM? DICOM (Digital Imaging and Communications in Medicine) is the file format every hospital, clinic, and imaging centre uses to store medical scans. When you receive a CD, USB stick, or download from your hospital, the files inside are almost always DICOM, even if the filenames don't say so. Unlike a regular photo, a DICOM file isn't just a picture. It contains the actual scan slice plus technical information about the scan: which body part, which scanner, slice thickness, patient identifiers, and dozens more details. Standard photo apps like Preview on Mac or Photos on Windows can't read DICOM files. You need a viewer that understands the format. That's what OpenMyScan does. Drop your DICOM folder above. Loading time depends on the study, file encoding and your device. ## How OpenMyScan works Loading time depends on the study size, file encoding and your device. No account or installation is needed. 1. ### Step 1 — Drop your scan folder Drag the folder your hospital gave you into the dropzone above. Or click “Choose folder” to browse to it. Look for a folder named DICOM, IMAGES, or your patient ID. The files inside usually have no extension or end in .dcm. 2. ### Step 2 — Your browser reads it locally OpenMyScan parses the DICOM files directly on your computer. Nothing uploads. No server sees your scan. The whole study lives in your browser tab's memory. 3. ### Step 3 — Scroll, zoom, adjust Use the slice slider or left/right arrow keys to move through slices. Zoom in on details. Adjust brightness and contrast from the sidebar. Switch between sequences if your study has multiple. ## Why most DICOM online viewers upload — and why this one doesn't Most DICOM online viewers upload your scan to a server before showing it to you. OpenMyScan doesn't. Your files are read directly by your browser, in memory, on your device. Closing the tab releases the loaded study from memory. Local previews and settings can remain; clear this site’s browser data to remove them completely. This matters because medical scans are sensitive. They contain your name, your medical record number, and details about your health. Uploading them to a stranger's server, even briefly, is a privacy decision worth thinking about. We built OpenMyScan around the assumption that you shouldn't have to. The technology to read DICOM files in the browser has existed for years; we just made it patient-friendly. ## Questions people actually ask ### What modalities does OpenMyScan support? MRI, CT, X-ray, ultrasound, mammography, PET, and other DICOM-compliant scans. If your hospital exported it as DICOM, OpenMyScan can read it. ### Does it work on Mac, Windows, and Linux? Use a current Chrome, Safari, Edge, or Firefox on a laptop or desktop with a browser window at least 1200 pixels wide. Browser and DICOM encoding support can vary. There is nothing to install. ### Can I view my scan on my phone? The viewer requires a browser window at least 1200 pixels wide. Use a laptop or desktop, or a tablet only if its browser window meets that width. An iPad at 1180 pixels in landscape is still too narrow. Guides work on smaller screens. ### How big a scan can I open? We've tested with studies up to several thousand slices. Larger studies take longer to load but should work on any modern computer with a few gigabytes of free RAM. ### Is OpenMyScan a diagnostic tool? No. OpenMyScan is a viewer for images you already own. It is not FDA- or CE-cleared, and it is not a substitute for medical advice. Always discuss your scan results with your doctor. ### What happens to my files when I close the browser tab? Nothing leaves your device, and nothing is uploaded. The scan itself only ever lived in your browser's memory, and closing the tab releases it. One thing does stay behind on your own computer: a small preview image of each series, so the sidebar loads instantly next time. You can remove those any time with "Clear thumbnail cache" in Settings. ### Is OpenMyScan really free? Yes. The viewer is free forever, no account needed. Saving slices as images, sharing scans, and comparing two scans are all included. No subscription, no paywall. ## Popular guides [Convert DICOM to JPG Turn any slice into a standard JPG image.](https://openmyscan.com/en/tools/dicom-to-jpg) [Hospital scan CD: how to open it Step-by-step for opening a hospital CD.](https://openmyscan.com/en/guides/hospital-gave-me-scan-cd-how-to-open) [What is a DICOM file? Plain-English explanation of the format.](https://openmyscan.com/en/guides/what-is-dicom-format) [Free MRI viewer Open MRI studies with sequence support.](https://openmyscan.com/en/mri-viewer) OpenMyScan is a viewer for images you already own. It is not a diagnostic tool, is not FDA- or CE-cleared, and does not replace professional medical advice. Always consult your doctor.