Spreadsheet security
Security
Protect encrypted workbooks, uploads, generated output, temporary files, and spreadsheet formulas.
Security boundaries
Protect the file before, during, and after spreadsheet processing.
Keep confidentiality, workbook editing restrictions, and application-level validation as separate controls. Choose the guide that matches the boundary you are protecting.
01Input boundaryEncrypted input →02Output boundaryOutput security →03Application boundarySecurity checklist →
Encrypted input
Open Standard or Agile encrypted XLSX workbooks through normal or large-reader APIs without weakening the file-open boundary.
Encrypted and protected output
Create password-to-open XLSX files and apply workbook-structure or worksheet editing restrictions for controlled delivery.
Application security
Validate uploads, constrain package resources, sanitize paths, prevent formula injection, and keep failures safe for production.
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