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Open-source React component edits DOCX, XLSX and PPTX files in the browser without a server

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A developer released an MIT-licensed React component that opens and edits Word, Excel and PowerPoint files directly in the browser. The author built it to avoid running a document server or relying on view-only libraries that struggle with large spreadsheets. According to the post, the engine streams files lazily and parses XML in a Web Worker, so a 300,000-row sheet opens in roughly 300 milliseconds. Editing covers text, tables, formulas, slides and shapes, with optional real-time collaboration that requires a small WebSocket backend. The project is only a few days old, lacks support for charts, pivot tables and some other features, and the author acknowledges it was largely written with AI coding assistance.

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