# Excel Field-Level Decryptor

Decrypt specific fields in Excel files using various decryption methods to restore encrypted information

> Canonical page: https://elysiatools.com/en/tools/excel-field-decryptor

- **Category:** Security

- **Keywords:** excel, decryption, field decryption, xlsx, xls, data security, aes, base64, privacy, data restoration, decode

## Overview

The Excel Field-Level Decryptor is a secure utility designed to restore encrypted or obfuscated data within your spreadsheet files. It supports multiple decryption methods, including AES, Base64, and Caesar cipher, allowing you to target specific columns or entire worksheets for quick and accurate data recovery.

## Inputs

- **Encrypted Excel File** (file)
- **Decryption Method** (select)
- **Fields to Decrypt (optional)** (text): Specify which Excel columns to decrypt. If empty, all fields will be decrypted by default.
- **Decryption Key (for AES)** (text): Only required for AES decryption method. Use to same key that was used for encryption.
- **Caesar Cipher Shift Amount** (number): Number of positions to shift back for Caesar cipher decipher (1-25)
- **Worksheet Index** (number): Index of worksheet to process (0 for first worksheet, 1 for second, etc.)
- **First Row Contains Headers** (checkbox): Treat first row as column headers
- **Output Format** (select)
- **Output Only Decrypted Data** (checkbox): Skip detailed analysis and only output decrypted data

## When to use

- Recovering sensitive information that was previously obfuscated for privacy or transport.
- Standardizing data exports where specific fields were encoded using common algorithms.
- Restoring access to encrypted spreadsheet content when you possess the necessary keys or shift values.

## How it works

- Upload your Excel file and select the appropriate decryption method from the available options.
- Specify the target columns or fields if you only need to decrypt a subset of your data.
- Provide the required decryption key or shift amount if using AES or Caesar cipher methods.
- Choose your preferred output format and download the restored spreadsheet.

## Use cases

- Decoding Base64-encoded contact information exported from legacy CRM systems.
- Restoring sensitive financial figures protected by AES encryption for secure internal sharing.
- Reversing Caesar-shifted text fields in datasets used for data analysis and reporting.

## Frequently asked questions

### Which file formats are supported?

The tool supports standard Excel formats, including .xlsx and .xls files.

### Do I need a key for all decryption methods?

No, a key is only required for AES decryption. Other methods like Base64 or Caesar cipher use different parameters.

### Can I decrypt only specific columns?

Yes, you can enter comma-separated field names in the 'Fields to Decrypt' option to target specific data.

### What happens if I don't know the decryption method?

You can select the 'Auto-Detect Method' option, and the tool will attempt to identify and apply the correct decryption logic.

### Is my data secure during the process?

The tool processes your file locally or via secure server-side operations to ensure your data remains private and is not stored permanently.

## Related tools

- [Excel Field-Level Encryptor](https://elysiatools.com/en/tools/excel-field-encryptor): Encrypt specific fields in Excel files using various encryption methods to protect sensitive information
- [Excel to CSV Converter](https://elysiatools.com/en/tools/excel-to-csv): Convert Excel file to CSV format, extracting data from the first worksheet
- [Excel to HTML Table Converter](https://elysiatools.com/en/tools/excel-to-html): Convert Excel file to HTML table format, extracting data from the first worksheet
- [Excel to JSON Converter](https://elysiatools.com/en/tools/excel-to-json): Convert Excel file to JSON format, extracting data from the first worksheet
- [Excel to Markdown Converter](https://elysiatools.com/en/tools/excel-to-markdown): Convert Excel file to Markdown table format, extracting data from the first worksheet
- [Excel to XML Converter](https://elysiatools.com/en/tools/excel-to-xml): Convert Excel file to XML format, extracting data from the first worksheet
- [Excel to .xlsx Converter](https://elysiatools.com/en/tools/excel-version-converter): Convert .xls files to .xlsx format. Note: Only supports converting old .xls files to new .xlsx format.
- [XLSX Conditional Formatting Rule](https://elysiatools.com/en/tools/xlsx-conditional-formatting-rule): Batch-apply conditional formatting rules such as threshold highlights, data bars, and color scales to Excel worksheets

## Samples

- [XLS Samples](https://elysiatools.com/en/samples/xls-samples): Sample legacy Excel (XLS) files for binary spreadsheet parsing and import tests
- [XLSX Samples](https://elysiatools.com/en/samples/xlsx-samples): Sample XLSX spreadsheets for worksheet parsing and data extraction testing
- [Nginx Log Parser Samples](https://elysiatools.com/en/samples/nginx-log-samples): Comprehensive Nginx log samples for testing log-parser tool, including access logs and error logs with various formats and scenarios
- [Text Case Format Samples](https://elysiatools.com/en/samples/text-case-formats): Examples of different text case formats: camelCase, snake_case, kebab-case, PascalCase, and more

## Related content

- [Document Encryption and Permissions Workflow](https://elysiatools.com/en/hubs/document-encryption-permissions-workflows): Protect files and selected data fields, open encrypted PDFs with authorized credentials, set or remove permissions, and verify reversible output and reader compatibility.