Excel Security Checklist Before Sharing — 7 Things to Review [2026]

Before you share an Excel workbook, spend two minutes on this quick review. It prevents leaks and improves recipient experience.

1) Classification and intent

• Need confidentiality? Encrypt with a password to open.
• Only want to prevent edits? Use sheet/workbook protection.

2) Visible and hidden content

• Hidden or “very hidden” sheets: decide to keep or remove.
• Hidden cells or formats that mask data.
• Defined names pointing to sensitive ranges.

3) External links and sources

• Links to other files or URLs: break or update.
• Queries/Power Query: validate credentials and scope.

4) Macros and automation

• Remove unnecessary macros; sign and document required ones.
• Inform recipients about logic that impacts results.

5) Metadata and properties

• “File → Info → Inspect Document”: clean properties, comments, personal info, and hidden content.

6) Appropriate protection

• Apply sheet and workbook protection with editing exceptions if needed.
• For sensitive data, use encryption (password to open). Do not share the key over unsecured chat/email.

7) User experience

• Provide brief instructions (a “README” sheet or notes).
• Consider exporting to PDF for read‑only consumption when applicable.

8) Sharing and permissions

• Prefer permissioned, expiring links (OneDrive/SharePoint) over attachments.
• Least privilege: only who needs it, for as long as needed.

9) Final verification

• Open as a guest or on another device to validate.
• Test passwords and permissions before sending.

More resources: /en/excel-protection-vs-encryption and /en/excel-workbook-protection.

Guided workflow (quick)

1. Clean: File → Info → Check for Issues → Inspect Document → Remove suggested sensitive items.
2. Protect:
   • Editing only: Review → Protect Sheet/Workbook (configure exceptions).
   • Confidentiality: File → Info → Protect Workbook → Encrypt with Password.
3. Permissions: share via OneDrive/SharePoint with expiration and least privilege.
4. Verify: open as guest/other device; validate prompts, links, and macros.

Delivery options

• Read‑only consumption: export to PDF.
• Dynamic collaboration: permissioned link with version control in M365.
• Restricted environments: IRM/Sensitivity labels if supported by your organization.