Weasis is a standalone and web-based software for visualizing images obtained from medical imaging devices. This free DICOM viewer is used in healthcare by hospitals, health networks, multicenter research trials, and patients.

• General information
• Download binary releases
• Live Demo with different datasets
• Issues (Old Issue Tracker)
• Forum: Google group or GitHub Discussions

Release History

See CHANGELOG

Build Weasis

See How to build Weasis

The master branch requires Java 21+.

Old branches are:

• 3.8.x (Java 8+)
• 2.5.x (Java 8+)
• 2.0.x (Java 6+)
• 1.2.x (Java 6+)

General Features

• Flexible integration with PACS, VNA, RIS, HIS or PHR (see integration documentation)
• Desktop distribution (Windows, macOS, and Linux)
• Responsive user interface working well on high DPI screens
• Web access through weasis protocol
• Multi-language support
• Configuration of preferences on server-side and client-side
• API for building custom plug-ins
• DICOM Send (storeSCU and STOW-RS)
• DICOM Query/Retrieve (C-GET, C-MOVE and WADO-URI) and DICOMWeb (QUERY and RETRIEVE)
• Dicomizer module to convert standard images into DICOM files
• Embedded DICOM viewer in CD/DVD or other portable media

Viewer Features

• Display all kinds of DICOM files (including multi-frame, enhanced, MPEG-2, MPEG-4, MIME Encapsulation, DOC, SR, PR, KOS, AU, RT and ECG)
• Viewer for common image formats (TIFF, BMP, GIF, JPEG, PNG, RAS, HDR, and PNM)
• Image manipulation (pan, zoom, windowing, presets, rotation, flip, scroll, crosshair, filtering...)
• Layouts for comparing series or studies
• Advanced series synchronization options
• Display Presentation States (GSPS) and Key Object Selection
• Create key images (Key Object Selection object) by selection
• Support of Modality LUTs, VOI LUTs, and Presentation LUTs (even non-linear)
• Support of several screens with different calibration, support of HiDPI (High Dots Per Inch) monitors, full-screen mode
• Orthogonal Multi-planar Reconstruction (MPR)
• Maximum Intensity Projection
• Volume rendering with presets
• Display Structured Reports
• Display and search into all DICOM attributes
• Display cross-lines
• Measurement and annotation tools
• Region statistics of pixels (Min, Max, Mean, StDev, Skewness, Kurtosis, Entropy)
• Histogram of modality values
• SUV measurement
• Save measurements and annotations in DICOM PR or XML file
• Import CD/DVD and local DICOM files
• Export DICOM with several options (DICOMDIR, ZIP, ISO image file with Weasis, TIFF, JPEG, PNG...)
• Magnifier glass
• Printing to DICOM and system printers
• Read DICOM image containing float or double data (Parametric Map)
• DICOM ECG Viewer