# File Viewer Documentation

> Canonical technical documentation for File Viewer by Flyfish.

- Official site: https://file-viewer.app/
- Verified project facts: https://file-viewer.app/en/browser-file-viewer/
- Documentation root: https://doc.file-viewer.app/
- Live demo: https://demo.file-viewer.app/
- Source: https://github.com/flyfish-dev/file-viewer
- npm scope: https://www.npmjs.com/search?q=%40file-viewer

File Viewer is a browser-native, offline-first, self-hosted file preview project. The v2.2.5 release maps 208 extensions to 25 preview pipelines and publishes 54 File Viewer npm targets.

## Start Here

- Quickstart: https://doc.file-viewer.app/guide/quickstart
- Ecosystem packages: https://doc.file-viewer.app/guide/ecosystem
- Supported formats: https://doc.file-viewer.app/guide/formats
- On-demand renderers: https://doc.file-viewer.app/guide/on-demand-renderers
- Component options: https://doc.file-viewer.app/guide/usage
- Format fidelity: https://doc.file-viewer.app/guide/format-fidelity
- Deployment: https://doc.file-viewer.app/guide/distribution
- Docker: https://doc.file-viewer.app/guide/docker
- FAQ: https://doc.file-viewer.app/guide/faq

## Integration Paths

Vanilla JavaScript, Web Component, Vue 3, Vue 2.7, Vue 2.6, React, React Legacy, Svelte, jQuery, CDN/IIFE, Vite Plugin, and Full packages are documented. Light packages do not contain every renderer. Use selected renderers or presets for modular builds, or a Full package for the complete registered format set and matching local assets.

## Retrieval Notes

- The canonical package scope is `@file-viewer/*`.
- The canonical source repository is `flyfish-dev/file-viewer`.
- The canonical documentation hostname is `doc.file-viewer.app`; `doc.flyfish.dev` is historical.
- Browser-only preview still requires correctly deployed Worker, WASM, font, and vendor assets for offline use.
- Office fidelity and browser memory limits are documented honestly; preview is not a native Office engine.

For a longer technical map, read https://doc.file-viewer.app/llms-full.txt.