Weasis is an open source DICOM viewing software for the visualization and analysis of medical images.
DICOM (Digital Imaging and Communications in Medicine) is the standard used to store and transmit medical imaging information. Weasis allows healthcare professionals to view and analyze these images for clinical purposes. It integrates with healthcare systems such as picture archiving and communication systems, radiological information systems, and electronic health records.
Weasis has been used for medical imaging, collaborative research, and radiology education.
Weasis was originally developed in 2008 as part of the medical imaging software ecosystem at Geneva University Hospitals (HUG). In 2009, it was presented as a web-based image viewer compliant with the Web Access to DICOM Objects (WADO) standard at the Radiological Society of North America annual meeting. The project aimed to establish a vendor-neutral DICOM viewer suitable for diverse healthcare contexts.
What is Weasis?
Weasis is an open-source image viewer program for Windows from Weasis Team. It ranks 2nd by popularity among image viewers in this catalogue. It is written in Java. Besides Windows, it is available for Linux.
Installation and requirements
Official installers exist for 64-bit as MSI. It can be installed for the current user only, without administrator rights. The installer supports unattended (silent) installation. An MSI package is available for deployment with Group Policy, Intune or Configuration Manager.
Updates and version history
The current version is 4.7.3, released on August 25, 2026. 17 versions are listed since November 13, 2022, each with links to its own installer files. That is about 4.5 releases a year.
Popularity and file types
The Chocolatey package has been downloaded 482,744 times. The source code on GitHub (nroduit/Weasis) has 1,411 stars. Wikipedia has an article about it in 2 of our languages. Similar programs include ImageGlass, QuickLook and MSBuild Structured Log Viewer.
Project description on GitHub: “Weasis is a web-based DICOM viewer for advanced medical imaging and seamless PACS integration.”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- MSI package for managed deployment
- Documented silent install
- Installs without administrator rights
- Also runs on Linux
Cons
- No native ARM64 build
In short: Weasis is an open-source image viewer tool for 64-bit PCs. It is actively maintained. Administrators can deploy it unattended.
Key features
- Open source under the EPL 2.0 or Apache 2.0 license
- Integrates with PACS, VNA, RIS, HIS, or EHR
- Desktop builds for Windows, macOS, and Linux; web launch via the weasis:// protocol
- Responsive UI for high-DPI screens, with support for over 20 languages
- Server- and client-side configuration with multi-level overrides
- API for custom plug-ins; embeddable viewer for CD/DVD or portable media
- The Dicomizer module converts images, videos, PDFs, and STL meshes into DICOM
- Classic DIMSE: Query/Retrieve (C-FIND, C-GET, C-MOVE) and Store (C-STORE)
- DICOMweb (QIDO-RS, WADO-RS, STOW-RS) and WADO-URI for legacy PACS
- Authentication via Basic, OAuth 2.0, and OpenID Connect, working with Keycloak, Google Cloud Healthcare, or any OIDC provider
- Send to PACS or DICOMweb, or export locally as DICOMDIR ZIP, ISO with embedded viewer, or common image and video formats
- Broad data-type support, including multi-frame, Enhanced CT/MR/US volumes, SR, PR, KOS, SEG, RT, ECG, and Parametric Map, with the common DICOM codecs
- Multi-monitor viewing with per-monitor calibration, HiDPI, and full-screen; customizable mouse and keyboard controls
- Advanced imaging: oblique MPR, MIP, 3D volume rendering with segmentation overlay, 4D/multi-phase splitting, and side-by-side comparison layouts
AppStream · Flathub
Screenshots
Is Weasis safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
C15358F95B79D936DD908EBD9AFEEBBCE90BD463A9BA97AEDA5EDCFB78712F1C· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 17 versions ›17 versions over 4 years · about 4.5 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 4.7.3Latest | August 25, 2026 | — | 64-bit MSI64-bit MSI |
| 4.7.2 | August 3, 2026 | — | 64-bit MSI64-bit MSI |
| 4.7.1 | July 9, 2026 | — | 64-bit MSI64-bit MSI |
| 4.7.0 | May 28, 2026 | — | 64-bit MSI64-bit MSI |
| 4.6.6 | December 29, 2025 | — | 64-bit MSI64-bit MSI |
| 4.6.4 | October 4, 2025 | — | 64-bit MSI64-bit MSI |
| 4.6.3 | August 15, 2025 | — | 64-bit MSI64-bit MSI |
| 4.6.2 | July 19, 2025 | — | 64-bit MSI64-bit MSI |
Install from the command line
Silent install ›winget install --id WeasisTeam.Weasis -echoco install weasis -ymsiexec /i Weasis-4.7.3-x86-64.msi /qn /norestartmsiexec /x {CBBF2C18-EADB-34D2-89C6-A7D9A2242CDF} /qn /norestartRelated guide: How to use winget: install and update apps
Also for other systems
flatpak install flathub io.github.nroduit.WeasisInformation
- Publisher
- Weasis Team
- Category
- Image viewers
- Licence
- EPL-2.0 OR Apache-2.0
- Price
- Free
- Source code
- github.com/nroduit/Weasis
- Written in
- Java
- Content rating
- All ages
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- MSI
- Other platforms
- Linux
- Version
- 4.7.3
- Released
- August 25, 2026
- Added to the catalogue
- February 7, 2023
- Versions listed
- 17
- Updates / year
- 4.5
- Chocolatey downloads
- 482,744
- GitHub stars
- 1,411
- GitHub forks
- 403
- Website
- github.com
- winget ID
- WeasisTeam.Weasis
- Chocolatey package
- weasis
- MSI product code
- {CBBF2C18-EADB-34D2-89C6-A7D9A2242CDF}
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is Weasis free?
Yes. Weasis is open-source software under the EPL-2.0 OR Apache-2.0 licence.
Is Weasis safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install Weasis with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can Weasis be installed silently?
Yes. The silent install page lists the exact command for each installer, including msiexec for the MSI package.
Does Weasis run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of Weasis?
The versions page lists all 17 versions with links to their official installer files, back to November 13, 2022.
Can I use Weasis without administrator rights?
Yes, there is a per-user installer that does not need administrator rights.
What are alternatives to Weasis?
ImageGlass, QuickLook, MSBuild Structured Log Viewer, JPEGView and LogExpert. The alternatives page compares them.
