SheetJS Data Preview Live Demo
(Base64 text works back to IE6; drag and drop works back to IE10)

Source Code Repo
Issues?  Something look weird?  Click here and report an issue
Output Format: 
 CSV
 JSON
 FORMULAE
 HTML
 XLSX




 Drop a spreadsheet file anywhere in the page to see sheet data 

... or paste a base64-encoding here


Advanced Demo Options:
Use Web Workers when available: 
Always use UTF8 for CSV / text: