Text Decryption Tool

Why Use Our Text Decryption Tool?

Our free text decryption tool seamlessly decrypts AES-256 encrypted text that was encrypted using our encryption tool or any compatible AES-256 encryption system. Recover your original text securely and instantly in your browser.

Key Features

• AES-256 Decryption: Industry-standard decryption for maximum security
• Password-Based Decryption: Decrypt using the same password used for encryption
• Custom Key Support: Use a 256-bit custom key for decryption
• Multiple Modes: Support for both GCM and CBC decryption modes
• Format Auto-Detection: Automatically detect Base64 or Hex encoding
• JSON File Import: Load encrypted data directly from JSON files
• Error Handling: Clear error messages for incorrect passwords or corrupted data
• Copy & Download: Save decrypted text easily
• 100% Client-Side: All decryption happens locally - your data never leaves your device

Common Use Cases

1. Recover Encrypted Messages

Decrypt private messages or confidential communications that were encrypted for secure transmission. Perfect for retrieving sensitive information shared through unsecured channels.

2. Access Protected Notes

Decrypt your encrypted notes, journal entries, or personal documents. Keep your private information secure in cloud storage and decrypt only when needed.

3. Retrieve Passwords and Keys

Safely decrypt stored passwords, API keys, or authentication tokens that were encrypted for security. Access credentials when you need them without exposing them in plain text.

4. Decrypt Business Data

Recover encrypted business information, financial records, or confidential client data. Maintain data security while ensuring authorized access when required.

5. Test Decryption Workflows

Verify your encryption/decryption implementations by testing with known encrypted data. Ensure your systems correctly handle AES-256 encrypted content.

How to Decrypt Text

Method 1: Load from JSON File (Easiest)

1. Click "Choose JSON File" and select the encrypted JSON file from our encryption tool
2. The tool automatically fills in the encrypted text, IV, salt, mode, and format
3. Enter the password or custom key you used for encryption
4. Click "Decrypt Text"
5. View, copy, or download your decrypted text

Method 2: Manual Entry

1. Paste the encrypted text in the first field
2. Enter the IV (Initialization Vector)
3. For password-based: Enter the salt and password
4. For custom key: Check "Use Custom Decryption Key" and enter the 64-character hex key
5. Select the encryption mode (GCM or CBC) that was used
6. Select the input format (Base64 or Hex)
7. Click "Decrypt Text"

Understanding Decryption Requirements

1. Encrypted Text

The ciphertext - your original text in encrypted form. This is the output from the encryption tool. It appears as a long string of random-looking characters in either Base64 or hexadecimal format.

2. Initialization Vector (IV)

A random value that was used during encryption. The IV ensures that encrypting the same text twice produces different ciphertext. It's not secret but is absolutely required for decryption. Without the correct IV, decryption will fail.

3. Salt (Password-Based Only)

For password-based encryption, the salt was used to derive the encryption key from your password. You need the exact same salt to derive the same key for decryption. If you used a custom key instead of a password, you don't need the salt.

4. Password or Encryption Key

The secret used to encrypt the data. This MUST be exactly the same as what was used during encryption:

• Password-based: Enter the exact same password (case-sensitive)
• Custom key: Enter the exact same 64-character hexadecimal key

5. Encryption Mode

Select the same mode that was used for encryption:

• GCM: Authenticated encryption mode
• CBC: Standard encryption mode

Using the wrong mode will cause decryption to fail or produce garbage output.

6. Input Format

Select the format that was used for the encrypted output:

• Base64: Shorter, uses A-Z, a-z, 0-9, +, /, =
• Hex: Longer, uses only 0-9, a-f

Troubleshooting Decryption Errors

"Decryption failed: Incorrect password, key, or corrupted data"

This error occurs when:

• The password is wrong (check for typos, case sensitivity)
• The encryption key is incorrect or incomplete
• The IV is wrong or incomplete
• The salt is wrong (for password-based decryption)
• The encryption mode doesn't match
• The encrypted data has been corrupted or modified

"Please enter the IV (Initialization Vector)"

The IV field is empty. You must provide the IV that was generated during encryption. Check your encrypted data JSON file or the IV output from the encryption tool.

"Custom key must be 64 hexadecimal characters"

If using a custom key, it must be exactly 64 hexadecimal characters (0-9, a-f). This represents a 256-bit key. Ensure you've copied the complete key.

Security Best Practices

Format Auto-Detection

Our tool automatically detects whether your encrypted data is in Base64 or Hexadecimal format when you paste it. This feature makes decryption easier by eliminating the need to remember the output format used during encryption.

• Base64 Detection: Identifies data containing A-Z, a-z, 0-9, +, /, and = characters
• Hex Detection: Identifies data containing only 0-9 and a-f characters
• Manual Override: You can still manually select the format if needed

Privacy & Security

Your privacy is our priority:

• 100% Client-Side: All decryption happens in your browser using the Web Crypto API
• No Server Communication: Your encrypted data, passwords, and keys never leave your device
• No Data Collection: We don't collect, store, or log any of your data
• No Tracking: We don't track what you decrypt or when
• Secure Implementation: Uses the browser's native cryptography APIs
• Open Standards: Compatible with standard AES-256 implementations

Compatibility

Our decryption tool is compatible with:

• Text encrypted using our encryption tool
• Any AES-256-GCM or AES-256-CBC encrypted data
• Data encrypted with PBKDF2 key derivation (100,000 iterations, SHA-256)
• Standard AES-256 implementations in other tools and programming languages

Technical Specifications

Frequently Asked Questions

Premium Features

Upgrade to premium for advanced decryption capabilities:

RSA Decryption

Decrypt data that was encrypted with RSA public key encryption using your private key. Perfect for secure key exchange and receiving encrypted messages.

File Decryption

Decrypt entire files including documents, images, videos, and archives. Supports large files with progress tracking and batch decryption.