Flyfish File Viewer is an Apache-2.0, browser-native, offline-first file preview toolkit for private and internal web apps. It maps 206 extensions across 24 pipelines—Office, PDF/OFD, CAD, archives, email, diagrams, 3D, media and data—without mandatory server-side conversion. Use modular components, presets or full packages across Vanilla JS/Web Components, React, Vue, Svelte and jQuery. Workers, WASM and assets can be self-hosted; read-only fidelity varies by format.
