Weasis

Free medical DICOM viewer

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About

An open-source DICOM viewer for standalone and web use, built for medical image visualization in PACS and DICOM workflows — from routine reading to AI-assisted review and quantitative imaging. It is used by hospitals, health networks, multicenter research trials, and patients. General features: Connectivity and interoperability: Viewer features: - Open source under the EPL 2.0 or Apache 2.0 license - Integrates with PACS, VNA, RIS, HIS, or EHR - weasis://Desktop builds for Windows, macOS, and Linux; web launch via theprotocol - 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 - DicomizerThemodule 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 - EnhancedBroad data-type support, including multi-frame,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 - Measurement and annotation, including length, area, angle (Cobb), pixel-region statistics, histograms, and SUV for PET/nuclear imaging - Dedicated viewers for ECG waveforms, structured reports (SR), audio (AU), and radiotherapy (RT structure set, dose, DVH)

Additional information

Project

Developer: Nicolas Roduit
License: EPL-2.0 OR Apache-2.0 (free software)What this license lets you do
Homepage: nroduit.github.io
From the project: Report a bug Source code Help translate Documentation FAQ

Install

Available via: Flatpak · Snap (4) · Arch Linux · Nixpkgs
All 7 packagings
Flathub (Flatpak), Snap Store, Snap Store (Candidate build), Snap Store (Beta build), Snap Store (Nightly build), AUR (Bin build), Nixpkgs
Flatpak sandbox: Wide access
Runs in a sandbox, but a broad part of it is open — typical for tools that need to manage your files or system. It shows what the app is able to do, not what it does.
What it can access
Reads and changes all your files
Can access all devices, including cameras and USB
Reads and changes files in /tmp
Uses the internet
Plays and records audio
Uses the older X11 display system, which doesn't isolate windows from each other

About this data

Sources: 7 independent sources agree
Catalog data as of: October 12, 2026

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How each source lists it (7)

Source	Name	Version	Built by	License	Description
Flathub (Flatpak)	Weasis	4.7.3	Official build	EPL-2.0 OR Apache-2.0	Free medical DICOM viewer
Snap Store	weasis	4.7.3	—	Apache-2.0 OR EPL-2.0	A free/libre/open medical DICOM viewer
Snap Store (Candidate build)	weasis	4.7.3	—	Apache-2.0 OR EPL-2.0	A free/libre/open medical DICOM viewer
Snap Store (Beta build)	weasis	4.7.3	—	Apache-2.0 OR EPL-2.0	A free/libre/open medical DICOM viewer
Snap Store (Nightly build)	weasis	4.7.3	—	Apache-2.0 OR EPL-2.0	A free/libre/open medical DICOM viewer
AUR (Bin build)	weasis-bin	4.7.3-1	Community repack	EPL-2.0	Weasis is a free medical DICOM viewer used in healthcare by hospitals, health networks, multicenter research trials, and patients.
Nixpkgs	weasis	4.7.3	Distribution build	Apache-2.0 AND EPL-2.0	Multipurpose standalone and web-based DICOM viewer with a highly modular architecture