What Most People Miss About Excel Protection Password Recovery

Yes, you can regain access to a password-protected Excel file when you can’t remember the protection password. But if you assume Excel stores that password like a login—and try resetting it via File > Info—you’ll hit a dead end.

The Problem

You open Q3_Sales_Report_Final_v2.xlsx, double-click Sheet1—and get this: "The password you entered is incorrect." You’ve tried "Q32024", "SalesAdmin", "password123", and your birthday. Nothing works. The file was last modified by Priya Mehta on 2024-06-18. You’re not the original author, but you inherited the workbook—and now you need to update cells in B5:B12 (regional totals) and refresh the pivot table anchored at F2. Worse, the workbook structure is locked too. Right-clicking any tab shows "Unprotect Sheet..." grayed out. You check Review > Protect Workbook—it says "Structure protected". No recovery option appears anywhere. Here’s what’s actually happening behind the scenes: Excel doesn’t encrypt sheet-level protection. It uses a trivial 16-bit hash (not even salted). That means the password isn’t stored securely—it’s *obfuscated*, not encrypted. So while you can’t ‘recover’ the original password, you *can* generate a working one that matches the same hash.

Sheet	Protected?	Locked Cells	Last Modified
Summary	Yes	A1:E20 (including formulas in D2:D15)	2024-06-18
Raw_Data	Yes	A2:G104 (all rows except header)	2024-06-17
Dashboard	Yes	B3:C8, E4:E12 (KPI inputs)	2024-06-15
Archive_2023	No	—	2024-01-12
Notes	Yes	A1:A100 (project comments)	2024-06-10

The Solution

This method works for sheet protection only (not workbook encryption with a .xlsx password). It exploits Excel’s weak hash algorithm using a VBA macro you paste directly into the file. No downloads. No external tools. And no risk of corruption—because you never touch the original data.

Press Alt + F11 to open the Visual Basic Editor.
In the Project Explorer (left pane), double-click the target sheet (e.g., Sheet1 (Summary)).

Paste this exact code into the white editor window:

Sub UnprotectSheet()
Dim i As Integer, j As Integer, k As Integer
Dim l As Integer, m As Integer, n As Integer
Dim i1 As Integer, i2 As Integer, i3 As Integer
Dim i4 As Integer, i5 As Integer, i6 As Integer
For i = 65 To 66: For j = 65 To 66: For k = 65 To 66
For l = 65 To 66: For m = 65 To 66: For n = 65 To 66
For i1 = 65 To 66: For i2 = 65 To 66: For i3 = 65 To 66
For i4 = 65 To 66: For i5 = 65 To 66: For i6 = 65 To 66
ActiveSheet.Unprotect Chr(i) & Chr(j) & Chr(k) & Chr(l) & Chr(m) & Chr(n) & Chr(i1) & Chr(i2) & Chr(i3) & Chr(i4) & Chr(i5) & Chr(i6)
If Not ActiveSheet.ProtectContents Then Exit Sub
Next: Next: Next: Next: Next: Next
Next: Next: Next: Next: Next: Next
End Sub

Press F5 to run it. In under 2 seconds, the sheet unlocks. You’ll see "Unprotect Sheet" become clickable again in the Review tab.

What makes this elegant is its simplicity: it brute-forces only 2 characters (A–B) across 12 positions—just 4,096 combinations—not the full ASCII set. That’s why it runs instantly. Excel’s hash collision space is so narrow that AA, AB, or BB almost always satisfies the hash—even if the real password was AcmeCorpQ3!.

Step	Action	Result	Shortcut
1	Open VBA Editor	Blank module appears for active sheet	`Alt`+`F11`
2	Paste macro	Code appears in editor window	Ctrl+V
3	Run macro	Sheet unprotects instantly	`F5`
4	Verify	Select cell B7 → edit allowed → formula bar active	F2 (to edit)

Going Further

If the macro fails (rare—but possible with older .xls files or custom hash variants), try these alternatives:

XML extraction (for .xlsx only): Rename the file to report.zip, open xl/worksheets/sheet1.xml, and search for sheetProtection. Delete that entire tag—including <sheetProtection... through />. Save, rename back to .xlsx. Excel will load the sheet unprotected.
Workbook structure unlock: If Review > Protect Workbook is active, go to File > Info > Protect Workbook > Encrypt with Password—then clear the field and click OK. This *only* works if no encryption password was set (just structure lock).
Auto-recover trick: Close Excel without saving. Reopen and choose Recover Unsaved Workbooks from the Backstage. Sometimes the pre-protection version appears in C:\Users\[user]\AppData\Roaming\Microsoft\Excel\.

Surprising tip: If the file opens in Google Sheets, right-click any sheet tab → Unprotect sheet. Google Sheets ignores Excel’s sheet protection entirely—and preserves all formulas and formatting. Export as .xlsx afterward.

When NOT to Use This

Don’t reach for the VBA macro if:

You’re dealing with a file-level encryption password (set via File > Info > Protect Workbook > Encrypt with Password). That password uses AES-128 and cannot be bypassed without brute-force tools—and even then, success depends on password strength.
The file was saved in Excel 97–2003 (.xls) format with strong password protection enabled. Those use a different hash and require expanded character ranges (A–Z, a–z, 0–9) — making the macro above ineffective unless modified.
You’re in a regulated environment (e.g., SOX, HIPAA) where tampering with protection violates audit policy—even if you own the file. In those cases, document the incident and request formal password reset from IT.
The workbook contains VBA project protection (Tools > VBAProject Properties > Protection). That’s a separate 256-bit key and requires hex editing or dedicated tools like Passware Kit.

Also: never run macros from untrusted sources. The code above is safe—it only calls ActiveSheet.Unprotect and exits immediately upon success.

Keyboard Shortcuts

These shortcuts speed up diagnosis and recovery:

Shortcut	Function	Use Case
`Alt`+`F11`	Open VBA Editor	Fastest way to inject recovery code
`Ctrl`+`Home`	Go to top-left cell (A1)	Quickly verify if sheet is truly locked (cell won’t highlight)
`Alt`+`R`, `P`	Toggle Protect Sheet	Opens dialog even if grayed out—reveals current state
`F12`	Save As	Always save unlocked copy with _UNLOCKED suffix before editing
`Ctrl`+`Shift`+`U`	Toggle formula view (A1 vs R1C1)	Helps spot protected ranges hiding formulas in plain sight