Fast, local viewing for whole-slide images
EOV is a modern, lightweight desktop viewer for pathology slides. Immediately open and inspect SVS, TIF, NDPI, MRXS, and other WSI formats directly from disk — no servers, no cloud, no setup.
Built for the work
A focused set of tools for viewing, navigating, and inspecting whole-slide images.
Fast Local Viewing
Open and inspect slides directly from disk. No servers, no uploads, no waiting. GPU acceleration when available, with a capable software fallback.
Drag-and-Drop Interface
Easily open slides by dragging and dropping them into the viewer, whether it's from your file explorer or an image that is already open.
Smooth Pan & Zoom
Navigate deep-zoom pyramids with responsive, multi-level tile rendering. Fluid interactions even with large slides.
Tabs & Panes
Open multiple slides in tabs. Split into panes for side-by-side comparison. Create panes by dragging and droppings tabs and files.
Minimap Navigation
An always-visible overview for fast orientation within large slides. Click or drag to pan anywhere on the slide with ease.
ROI & Measurement
Mark regions of interest and measure distances directly on the slide. Physical scale is automatically detected and accounted for when available.
Screenshots
Multi-Pane Layout
View and compare slides side by side in synchronized panes, each with independent zoom and navigation.
Measurement & ROI Marking
Mark regions and measure distances precisely, directly on the slide at any zoom level.
Built for
EOV is a small utility with a surgical focus: a fast, reliable, and user-friendly desktop viewer for whole-slide images. It is designed to fit into existing workflows and complement more robust, institution-scale tools. When you have a WSI file locally on your machine and just want to view it, EOV is here to help.
Researchers
Inspect whole-slide images on your workstation without extraneous infrastructure.
Developers
Build and debug pathology tooling with a fast, standalone viewer on your desktop.
Pathology-adjacent teams
Review slides without standing up servers or navigating complex deployments.
Anyone with WSI files
Open your slides. That's it! No accounts, no setup, no friction.
Supported formats
EOV opens pyramid-based whole-slide image files via OpenSlide. If OpenSlide supports a format on your system, EOV can load it.
Get EOV
Prebuilt binaries are available from GitHub Releases. Download, extract, run. Both x86 and ARM builds are available for all platforms. Run it anywhere!
Linux
AppImage and Flatpak
Windows
Portable zip
macOS
Pending
Open source. Permissively licensed.
EOV is open-source and part of the broader Eosin ecosystem. It is intentionally narrow in scope — a desktop viewer that complements heavier tooling. No "license file" friction, no telemetry, and no barriers to use or contribution. Just fast, local viewing for whole-slide images, built by and for the community.