Best Free DICOM Viewers

IrfanView is a fast, compact and innovative FREEWARE (for non-commercial use) graphic viewer for Windows XP, Vista, 7, 8 and 10. It is designed to be simple for beginners and powerful for professionals. IrfanView seeks to create unique, new and interesting features, unlike some other graphic viewers, whose whole "creativity" is based on feature cloning, stealing of ideas and whole dialogs from ACDSee and/or IrfanView! IrfanView was the first Windows graphic viewer worldwide with Multiple (animated) GIF support. One of the first graphic viewers worldwide with Multipage TIF support. The first graphic viewer worldwide with Multiple ICO support. Lossless JPG rotation, crop and EXIF date change (also in batch mode). Slideshow (save slideshow as EXE/SCR or burn it to CD). Batch conversion (with advanced image processing of all files). Support for embedded color profiles in JPG/TIF files. No registry changes without user action/permission!

Horos is a free, open source medical image viewer for macOS designed to support the medical imaging community with a fully functional, 64-bit DICOM viewer. Built on OsiriX 5.8, Horos is intended for research, education, and non-diagnostic medical imaging use. It supports a wide range of DICOM files and includes powerful tools such as 2D/3D multi-planar reconstruction, surface and volume rendering, and maximum intensity projection. Horos enables users to view, import, and export studies, measure anatomical structures, annotate images, and apply filters or adjustments for better visualization. It also offers anonymization tools, DICOM Query/Retrieve from PACS servers, and support for plugins and scripting for advanced customization. The interface is intuitive and adaptable for both novice and experienced users, with integration options for teaching files and educational workflows.

MILLENSYS Dicom Viewer "MiViewer" is a very easy to use general Dicom viewer software to view multi-modality images and cine-loops using the same software. MiViewer can load images from any media storage to view a Dicom study with all the tools needed from case navigation to image viewing. For Multi-Frame (Cine-loops) MiViewer can view multiple loops and play/stop navigate in the loop. "MiViewer" is considered a simple viewer for daily operations. MiViewer is a single file DICOM viewer MiViewer is a single file application that requires no setup , just click on miviewer.exe and it works, this makes it easy to run MiViewer in any Windows environment at home or at work, no need to call system administrators to allow you to setup applications.

3D Slicer is a free, open source software platform designed for the visualization, processing, segmentation, registration, and analysis of medical, biomedical, and other 3D images and meshes. It also facilitates the planning and navigation of image-guided procedures. Serving as a desktop application, 3D Slicer addresses advanced image computing challenges with a focus on clinical and biomedical applications. Additionally, it functions as a development platform, enabling the rapid creation and deployment of custom solutions for both research and commercial products. The platform boasts a robust community of knowledgeable users and developers collaborating to advance medical computing. 3D Slicer is distributed under a BSD-style license, imposing no restrictions on its use in academic or commercial projects. However, it is not FDA-approved, and users are responsible for ensuring compliance with applicable regulations.

​IMAIOS DICOM Viewer (IDV) is a free online DICOM viewer that allows users to browse medical images directly from their computer, CD, or DVD, delivering lightning-fast 2D rendering. No particular computer skills are required; simply drag and drop your images to the loading files area to display them on the DICOM viewer. A web browser is all it takes to run IDV, whether you are at your workstation or another station, ensuring no waste of time. Your files are not uploaded to our network; your computer handles everything, guaranteeing the security of patients' medical information. Fast and user-friendly, the following features are available: scroll through a series of images, adjust brightness and contrast, zoom, pan image, measure an angle or distance in cm between two points of the image, and preset windowing settings for CT. Accessible to everyone on IMAIOS and on our app IDV, our DICOM viewer is free for personal and non-commercial use.

​The Open Health Imaging Foundation (OHIF) Viewer is an open source, web-based medical imaging platform designed to serve as a foundational framework for developing complex imaging applications. It is optimized for the rapid loading of extensive radiology studies by pre-fetching metadata and streaming imaging pixel data as required. It utilizes Cornerstone3D for efficient decoding, rendering, and annotation of medical images. Out-of-the-box compatibility with DICOMWeb-compliant image archives is provided, alongside a data source API for integration with archives using proprietary API formats. OHIF's plugin architecture facilitates the creation of task-specific workflow modes that can leverage existing core functionalities. The user interface, built with React.js and Tailwind CSS, is both aesthetically pleasing and designed for extensibility, with UI components available in a reusable component library.

​Weasis is a free, open source DICOM viewer designed for both standalone and web-based use, featuring a highly modular architecture. It is widely utilized in healthcare settings, including hospitals, health networks, multicenter research trials, and by patients. As cross-platform software, Weasis offers flexible integration with PACS, RIS, HIS, or EHR systems. The viewer leverages the OpenCV library to deliver high-performance and high-quality medical imaging renderings. From version 4 onwards, Weasis features a responsive user interface aligned with operating system options, offering an enhanced experience on high-resolution screens. Key features include support for a wide range of DICOM files, such as multi-frame, enhanced, MPEG-2, MPEG-4, and more. Users can import DICOM files via DICOM Query/Retrieve (C-GET, C-MOVE, and WADO-URI) and DICOMWeb (QUERY and RETRIEVE), as well as import and export DICOM CD/DVD with DICOMDIR.

Sante DICOM Viewer is a powerful medical image viewer, anonymizer, converter, PACS client, mini PACS server, and DICOM CD/DVD burner for Windows. It supports all DICOM modalities and all manufacturers and offers all the needed features for viewing and processing DICOM files. These features include zoom, pan, rotate, brightness, contrast, inversion, and measurement tools such as distance, angle, and area. It supports 2D and 3D multi-planar reconstruction, surface and volume rendering, and maximum intensity projection. The viewer can read DICOM files from local disks, removable media, or network locations, and it also supports Query/Retrieve from PACS servers. Users can export images to JPEG, BMP, or AVI, create DICOM CDs with an embedded viewer, and anonymize DICOM files for privacy. It allows printing on Windows printers and DICOM printers and includes advanced tools like cine loop, fusion of studies, SUV calculations in PET studies, and customizable toolbars.

Mango Viewer (Multi-image Analysis GUI) is a viewer for medical research images designed to support a wide range of file formats, including DICOM, NIfTI, ANALYZE, and more. It provides extensive tools for navigating and analyzing medical imaging data, including multi-planar viewing (axial, sagittal, coronal), surface rendering, and region of interest definition and analysis. Mango offers a simple and intuitive user interface that supports scripting and batch processing to automate repetitive tasks. It includes features like image overlay, image fusion, 4D data visualization, and dynamic contrast-enhanced imaging analysis. ROI tools support statistics extraction such as volume, mean, and standard deviation, and ROIs can be drawn manually or generated algorithmically. Mango supports multi-image handling for comparative studies and integrates plugins for extended functionality, such as brain mapping, tractography, and perfusion analysis. It is platform-independent.

3DimViewer is a lightweight, open source software application designed for the visualization of medical DICOM images. Built using modern 3D graphics technologies, it allows for fast and interactive 3D visualization of medical data. It supports multiplanar reconstruction (MPR), volume rendering, and 3D surface rendering, making it useful for a variety of clinical and research applications. 3DimViewer includes basic tools for image navigation, such as zoom, pan, window/level adjustments, and measuring distances. It allows users to inspect DICOM metadata and provides a simple, user-friendly interface. It can read DICOM image data from local disks or removable media and does not require installation, as it is distributed as a standalone executable for Windows and macOS. 3DimViewer is intended to be an accessible tool for students, researchers, and professionals who need a fast and simple way to view 3D medical imaging data.

Pro Surgical 3D is a free, FDA-cleared DICOM viewer developed by Stratovan for viewing and interacting with patient-specific medical data. It enables users to load DICOM images and generate high-quality 3D visualizations for surgical planning and diagnostic review. The software supports advanced 3D surface rendering, volume rendering, and multi-planar reformatting, providing accurate anatomical models that enhance clinical insight. Users can rotate, zoom, and pan 3D models, as well as perform measurements and annotations directly on the visualization. Pro Surgical 3D is designed to improve patient outcomes through better preoperative planning by allowing precise analysis of complex anatomical structures. It is compatible with various imaging modalities such as CT and MRI and supports loading DICOM files from local drives. Pro Surgical 3D also includes intuitive tools for threshold adjustment and cropping to isolate regions of interest.

ONIS Viewer is a complete DICOM viewer and PACS workstation designed for medical imaging professionals seeking high performance and scalability. It supports a full range of DICOM formats and includes tools for image review, analysis, and diagnosis. ONIS offers essential functions such as window leveling, zoom, pan, rotation, and measurements, as well as advanced features like multi-planar reconstruction, 3D volume rendering, and cine loop playback. It provides robust annotation tools, comparison of multiple studies, and synchronized scrolling across series. ONIS is designed to integrate easily into existing workflows, supporting DICOM Query/Retrieve, DICOM Store, and DICOM Print services. It also features a built-in database with search functionality, allowing users to manage patient data efficiently. ONIS includes user authentication, logging, and access control to ensure data security and privacy.

ORPALIS DICOM Viewer is a free and lightweight application developed for browsing and viewing DICOM medical images. It allows users to open DICOM files from various imaging modalities such as CT scans, MRIs, and ultrasound images. Designed with simplicity in mind, the viewer provides essential tools for navigating medical images, including zoom, pan, and window leveling. It supports both monochrome and color images, multi-frame images, and offers drag-and-drop functionality for ease of use. It is intuitive and user-friendly, aimed at facilitating quick access to medical images without the need for complex setup or configuration. ORPALIS DICOM Viewer is based on GdPicture.NET technologies and demonstrates high performance and rendering accuracy. It is intended for non-diagnostic purposes and allows healthcare professionals, students, and developers to explore DICOM files with basic image manipulation tools.

​Miele-LXIV is a 64-bit DICOM viewer and workstation developed by Alex Bettarini. The macOS version, written in Objective-C and built with Xcode, is available as a free download. The Windows and Linux versions are complete rewrites in C++ using CMake and wxWidgets, currently featuring about 25% of the macOS functionality. The Windows version requires OpenGL (Core profile), and users can request a free evaluation version by contacting the developer. The Linux version, built with gcc, also necessitates OpenGL drivers (Core profile) and has been tested on Ubuntu 24.04 and Linux Mint 22.1. Miele-LXIV is a DICOM workstation, viewer and more. The project started in November 2014 as a fork of the popular open source 32-bit project OsiriX, but it has been modified to become a 64-bit application and to remove many of the limitations of the 32-bit version.

​Pacsbin is a personal cloud PACS solution that empowers users to take control of their medical images through a user-friendly, zero-footprint web viewer accessible via modern browsers. It allows for simple drag-and-drop uploads of DICOM files, which are automatically anonymized and compressed without quality loss. Users can annotate, share, post, and embed images effortlessly, eliminating the need for VPNs or retrieving archived images. It supports one-click PACS export, enabling swift and secure case management. Designed for mobility, Pacsbin ensures that cases are accessible anywhere, with the ability to download anonymized, full-quality DICOM files at any time. Automatic anonymization strips sensitive information from DICOM headers and removes scanned documents, enhancing privacy and compliance. Sharing studies is straightforward, allowing users to generate links to share cases across various platforms, whether for collaborative review or educational purposes.

DWV (DICOM Web Viewer) is a lightweight, open source DICOM viewer written in JavaScript and HTML5, designed to run in modern web browsers without the need for additional plugins or installations. It enables users to view and interact with DICOM medical images using standard web technologies. DWV supports features such as window/level adjustment, zoom, pan, image measurements (distance, angle), and DICOM tag inspection. It is compatible with multiple image layouts and supports multi-frame and multi-series DICOM files. The viewer provides basic annotation tools and the ability to load files from local storage or URLs. It offers support for drag-and-drop functionality and has an extensible architecture that allows developers to integrate it into custom web applications. DWV is actively maintained on GitHub and supports responsive design for various screen sizes, making it accessible on desktops, tablets, and mobile devices.