Show HN: SpreadsheetPreview: Pdf.js for Spreadsheets

Category: library

Tags: xlsx, spreadsheet, web-component, typescript, file-preview

Score: 6.3/10 (Innovation: 6, Technical: 7, Documentation: 6, Utility: 6)

SpreadsheetPreview is a browser-side XLSX workbook renderer packaged as a drop-in component (constructor API + Web Component) with TypeScript types and React/Angular/Vue support. It aims to be 'PDF.js for spreadsheets' by offering high-fidelity, view-only previews with virtual scrolling, frozen panes, and conditional formatting — without requiring Excel or sending files to a server. Interesting because spreadsheet preview in-browser is a genuine pain point with few polished open solutions.

Target audience: frontend devs, product teams embedding spreadsheet previews

Repository: https://spreadsheetpreview.com/

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