# A DICOM viewer for Windows, nothing to install > Open DICOM files, hospital discs and ZIPs on Windows 10 or 11 in Chrome, Edge or Firefox. Nothing to install, no admin rights, nothing uploaded. Free. Open DICOM files, a hospital disc, a folder or a ZIP in Chrome, Edge or Firefox on Windows. No installer and no admin rights — handy on a work or shared PC — and your scans aren't uploaded. Open your scans here: https://mesdicom.com/dicom-viewer-windows/ — or at https://mesdicom.com/ You can open DICOM files on Windows without installing a viewer. Open this page in Chrome, Edge or Firefox, click **Open a disc or folder…** or **Open files or a ZIP…**, and the images open in the browser tab — free, with nothing uploaded. ## How do I open a hospital disc on Windows? 1. Insert the disc. If Windows starts the disc's own viewer program, close it. 2. Click **Open a disc or folder…**. In the dialog, choose the DVD drive under **This PC**. 3. Don't pick DICOMDIR or the .exe on their own. MesDICOM reads the images on the disc. If the browser won't let you choose the drive itself, open the disc in File Explorer, copy everything on it to a folder, and choose that folder instead. You can also drag the disc's folders from File Explorer onto this page. More: [opening a CT or MRI disc](https://mesdicom.com/open-dicom-cd/). ## Why use a browser instead of a Windows program? - **No installer, no admin rights.** Useful on a work PC, a shared family computer or a library computer. - **You decide what is kept.** A study stays in your library only if you choose **Save to Library**, and **Remove All Studies** in Settings clears them. - **No viewer program from the disc.** The programs on hospital discs are often old, and you don't need them. - **The same on every computer.** The same viewer opens the same disc on Windows, Mac, Linux and ChromeOS. ## What can it do? Scroll through series, adjust brightness and contrast with 30 window presets, zoom, rotate and flip, measure lengths and angles, play cine, see a CT or MR series in three planes and in 3D, read every DICOM tag, and save an image as a PNG. ## How does it compare with Windows DICOM programs? - **MicroDicom** is a Windows program, free for non-commercial use; commercial use needs a paid licence. - **RadiAnt DICOM Viewer** is a commercial Windows program. - **Weasis** is free and open source and runs on Windows, macOS and Linux. These are installed programs with more tools for people who read images every day. MesDICOM on the web is for opening your own scans quickly, without installing anything. MesDICOM is for viewing and reference only — not intended for diagnosis or treatment decisions. ## Questions ### Do I need to install anything? No. MesDICOM runs in Chrome, Edge or Firefox. Nothing is installed, so it works on computers where you can't install software. ### Should I run the viewer program on the hospital disc? You don't need to. MesDICOM reads the images on the disc directly and never runs the program. If it starts by itself, close it. ### Which Windows versions work? Any Windows that runs a recent Chrome, Edge or Firefox, such as Windows 10 and 11. 3D needs WebGL 2, which most computers have. ### Is my data sent anywhere? Your images aren't. Your browser opens and processes them on your PC. Anonymous usage counts can be switched off in Settings. ## Related guides - [Open a CT or MRI disc](https://mesdicom.com/open-dicom-cd/index.html.md): Got your scan on a CD or DVD from the hospital? Open the DICOM images in your browser on Windows or Mac. No viewer program, no upload, free. - [DICOMDIR viewer](https://mesdicom.com/dicomdir-viewer/index.html.md): DICOMDIR is a disc's table of contents, not the images. Choose the whole disc or folder and MesDICOM opens the images it lists. Free, in your browser. - [DICOM viewer for Mac](https://mesdicom.com/dicom-viewer-mac/index.html.md): Open DICOM files, discs and ZIPs on a Mac in Safari, Chrome or Firefox — nothing to install. Plus the MesDICOM Mac app, and how it compares with Horos. Updated October 24, 2026. For viewing and reference only — not intended for diagnosis or treatment decisions.