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Excel Field-Level Encryptor

Encrypt specific fields in Excel files using various encryption methods to protect sensitive information

Click to upload file or drag and drop file here

Maximum file size: 0MB Supported formats: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel

Specify which Excel columns to encrypt. If empty, all fields will be encrypted by default.

Only required for AES encryption method. Use a strong, secure key.

Number of positions to shift for Caesar cipher (1-25)

Index of worksheet to process (0 for first worksheet, 1 for second, etc.)

Treat first row as column headers

Skip detailed analysis and only output encrypted data

Key Facts

Category
Security
Input Types
file, select, text, number, checkbox
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The Excel Field-Level Encryptor is a secure utility designed to protect sensitive data within your spreadsheets by applying various encryption and obfuscation methods to specific columns or entire datasets.

When to Use

  • •When preparing sensitive customer or employee data for sharing with third parties.
  • •When you need to mask personally identifiable information (PII) to comply with GDPR or internal privacy policies.
  • •When you want to secure specific columns like SSNs, emails, or phone numbers while keeping other spreadsheet data readable.

How It Works

  • •Upload your Excel file and specify the worksheet index you wish to process.
  • •Select your preferred encryption method, such as AES for high security or Base64 for simple encoding.
  • •Define the specific fields or columns you want to encrypt, or leave blank to secure the entire sheet.
  • •Choose your output format and download the processed file with your data protected.

Use Cases

Masking sensitive contact details in marketing lead lists before team distribution.
Securing payroll data columns in Excel reports before uploading to cloud storage.
Anonymizing research datasets by hashing or encrypting unique identifiers.

Examples

1. Protecting Customer PII

Data Analyst
Background
An analyst needs to share a customer feedback report with an external agency but must hide email addresses and phone numbers.
Problem
The file contains sensitive contact information that cannot be exposed in plain text.
How to Use
Upload the file, select 'AES Encryption', enter a strong key, and specify 'Email,Phone' in the fields to encrypt.
Example Config
encryptionMethod: aes, selectedFields: Email,Phone, encryptionKey: [YourSecureKey]
Outcome
The resulting Excel file contains the original data, but the Email and Phone columns are fully encrypted and unreadable without the key.

2. Obfuscating Internal IDs

Database Administrator
Background
A developer needs to provide a sample dataset to a vendor but wants to prevent the vendor from identifying real user accounts.
Problem
User IDs and internal account numbers are sensitive and should not be shared in clear text.
How to Use
Upload the dataset, select 'Base64 Encoding' or 'Caesar Cipher', and process the entire sheet.
Example Config
encryptionMethod: base64, hasHeader: true
Outcome
The user IDs are transformed into encoded strings, preventing unauthorized identification while maintaining the structure of the data for testing.

Try with Samples

xml, xlsx, xls
XLSX Samples
Sample XLSX spreadsheets for worksheet parsing and data extraction testing
preferred input family xlsx,xls
xlsx, xls
Copyright-Free AAC Audio Samples
High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression
preferred input family xlsx
xlsx
Copyright-Free OGG Vorbis Audio Samples
Open-source OGG Vorbis audio samples for testing and development, featuring excellent compression with nature sounds and meditation music
preferred input family xlsx
xlsx
Text Case Format Samples
Examples of different text case formats: camelCase, snake_case, kebab-case, PascalCase, and more
matched family xml
xml

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FAQ

Is my data stored on your servers?

No, your files are processed in memory and are not stored or retained after the operation is complete.

Which encryption method is the most secure?

AES encryption is the industry standard for secure data protection and is recommended for sensitive information.

Can I encrypt only specific columns?

Yes, you can specify individual column names in the 'Fields to Encrypt' option to target only the sensitive data.

What happens if I forget my AES encryption key?

If you use AES, the encryption is irreversible without the key. Please ensure you save your key securely.

Does this tool support both .xls and .xlsx files?

Yes, the tool supports both modern .xlsx and legacy .xls spreadsheet formats.

API Documentation

Request Endpoint

POST /en/api/tools/excel-field-encryptor

Request Parameters

Parameter Name Type Required Description
excelFile file (Upload required) Yes -
encryptionMethod select Yes -
selectedFields text No Specify which Excel columns to encrypt. If empty, all fields will be encrypted by default.
encryptionKey text No Only required for AES encryption method. Use a strong, secure key.
caesarShift number No Number of positions to shift for Caesar cipher (1-25)
worksheetIndex number No Index of worksheet to process (0 for first worksheet, 1 for second, etc.)
hasHeader checkbox No Treat first row as column headers
outputFormat select Yes -
encryptedOnly checkbox No Skip detailed analysis and only output encrypted data

File type parameters need to be uploaded first via POST /upload/excel-field-encryptor to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-excel-field-encryptor": {
      "name": "excel-field-encryptor",
      "description": "Encrypt specific fields in Excel files using various encryption methods to protect sensitive information",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=excel-field-encryptor",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]