Yu Wang

CTO at Flyfish | Building File Viewer

About

CTO at Flyfish with 10+ years in web and enterprise software. I built and maintain File Viewer, an open-source toolkit for previewing Office, PDF, CAD, and more in the browser. I care about privacy, offline deployment, and software that works.

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File Viewer

GitHub

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Maker History

File ViewerPreview Office, PDF, CAD and more in the browser
Jul 2026

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Joined Product HuntJuly 13th, 2026

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2mo ago

File Viewer - Preview Office, PDF, CAD and more in the browser

Uploading a private DOCX just to preview it is awful. File Viewer keeps the work in the browser. It maps 206 extensions to 24 lazy preview pipelines for Office, PDF/OFD, CAD, archives, email, diagrams, 3D, media and data. Use it with plain JavaScript, Web Components, React, Vue, Svelte or jQuery. Workers, WASM, fonts and other assets can stay on your own server. It is Apache-2.0. Office fidelity and huge files are still the hard parts.