Deep Zoom Images
Built on OpenSeaDragon for smooth pan/zoom on gigapixel images. Supports DZI tiles and standard image formats.
osdlabel
Web-based image annotation library with rich drawing controls, customizable contexts, and built-in serialization. Powered by OpenSeaDragon for deep zoom tiled images, Fabric.js for canvas rendering, and SolidJS for reactive UI.
Features
Section titled “Features”5 Drawing Tools
Rectangle, circle, line, point, and freehand path tools with full post-creation editing — select, move, resize, rotate.
Multi-Image Grid
View and annotate multiple images simultaneously in a configurable grid layout with filmstrip navigation.
Annotation Contexts
Define per-context tool constraints with count limits, per-image or global scoping, and image-level filtering.
Type-Safe
Strict TypeScript with branded ID types, discriminated union geometries, and full readonly data
model.
Serialization
Round-trip JSON serialization with validation. Export and import annotation documents with a single function call.
Quick Install
Section titled “Quick Install”npm i osdlabelpnpm add osdlabelyarn add osdlabelbun add osdlabeldeno add osdlabelLicense
Section titled “License”BSD 3-Clause