How to set password to Xlsb file

Sheetize XLSB Password Setter for .NET provides a simple yet powerful API for applying password protection to an Excel binary workbook while preserving all worksheets, charts, and formatting. This is useful when you need to secure a file before sharing it or integrating it into pipelines that require encrypted Excel files.

Main Features

Apply Password to XLSB

Encrypt an existing XLSB file with a user‑defined password. The protection covers opening the file, and optional restrictions on editing, printing, and structure.

Preserve Formatting & Objects

All cell styles, formulas, tables, charts, and images remain intact after encryption.

Streaming Support

Protect large workbooks in a streaming fashion to keep memory usage low, ideal for batch processing of many files.

Detailed Instructions

XLSB Password‑Protection Workflow

To set a password on an XLSB file with Sheetize, follow these steps:

  1. Initialize the Protector: Create an instance of SpreadsheetLocker.
  2. Configure Options: Set LockerSaveOptions with the desired password and protection flags (e.g., allow editing objects, allow printing).
  3. Define File Paths: Provide the source XLSB path and the destination protected XLSB location.
  4. Execute Protection: Call Process with the prepared load and protection options.

Example – Unlock an XLSB file with a password

using Sheetize;
 var loadOptions = new UnlockerLoadOptions
 {
     InputFile = "Baby_growth_tracker.xlsx",
     Password = "Test"
 };
 var saveOptions = new SaveOptions
 {
     OutputFile = "E:\\",
     
 };
 SpreadsheetUnlocker.Process(loadOptions, saveOptions);

Example – Unlock an XLSB file with a write‑protection password

using Sheetize;

 var loadOptions = new UnlockerLoadOptions
 {
     InputFile = "Baby_growth_tracker.xlsx",
     PasswordOfWriteProtection = "Test"
 };
 var saveOptions = new SaveOptions
 {
     OutputFile = "E:\\",
     
 };
SpreadsheetUnlocker.Process(loadOptions, saveOptions);

Expanded Format Support

  • Sheetize can also apply password protection to CSV, TSV, and HTML exports generated from a workbook (the resulting files are wrapped in a ZIP with encryption).

With these capabilities, Sheetize makes XLSB password protection effortless, whether you need a quick one‑off script or a production‑grade service that secures thousands of spreadsheets daily.

 English