Office preview looks easy until a customer uploads a real contract.

The open-source File Viewer is great for broad, browser-side preview. It is not enough for every business file. Old DOC/XLS/PPT files, exact pagination, complicated tables, and huge spreadsheets can turn a clean demo into a terrible production bug.

Flyfish Office Preview is the commercial path for those cases. It embeds DOC, DOCX, PPT, PPTX, XLS, and XLSX preview in SaaS products, OA systems, knowledge bases, contract tools, archives, and private intranets.

Teams get complete source delivery, commercial or enterprise licensing, private deployment guidance, integration support, and one year of version updates on the commercial plan.

The product is already used in telecom, university, and industrial-internet work shown on the product page.

Demo: https://demo.flyfish.group/

We do not claim perfect fidelity. We built this for the point where a general open-source renderer is no longer good enough and the release needs a clear owner.