Encryption & Decryption
Encrypt and decrypt text with AES-256-GCM, AES-256-CBC, or ChaCha20-Poly1305 and PBKDF2 using your secret password.
How to Use Encryption & Decryption
Choose Encrypt or Decrypt
Select whether you want to lock plaintext with a password or unlock encrypted text.
Select Algorithm & Enter Passphrase
Pick AES-256-GCM (AEAD), AES-256-CBC (OpenSSL), or ChaCha20-Poly1305 (WireGuard) and enter your password.
Get Protected Ciphertext
Copy the compact encrypted payload (swu1_...) or JSON to send securely via email or chat.
Key Benefits
- Multi-algorithm support: AES-256-GCM (AEAD), AES-256-CBC (OpenSSL), and ChaCha20-Poly1305 (RFC 8439)
- PBKDF2 key derivation with 100,000 iterations of SHA-256 and unique random salt
- Automatic algorithm detection on paste in Decryption mode
- Compact single-string payload format (swu1_...) with tamper detection
Browser & Hardware Notes
- There is NO password recovery mechanism; if you lose your passphrase, the data cannot be decrypted.
Frequently Asked Questions about Encryption & Decryption
How Encryption & Decryption Operates Privately on Your Device
Unlike traditional cloud services that transmit your confidential files across the open internet to remote servers, SafeWebUtil operates on a strict zero-upload client-side architecture. Every transformation performed by Encryption & Decryption executes exclusively within your browser's secure memory sandbox.
Native Web Crypto API (SubtleCrypto)
All cryptographic hashing, signing, and encryption routines strictly execute through browser-native Constant-Time primitives, immune to timing side-channel attacks.
Authenticated Military-Grade Ciphers
Utilizes AES-256-GCM authenticated encryption and PBKDF2 with high iteration counts to ensure data confidentiality and cryptographic tamper resistance.
Zero Ingestion & Ephemeral Memory
Plaintext passwords, JWT tokens, and symmetric keys reside exclusively in temporary JavaScript memory and are zeroized as soon as the tab is closed.
Engineering Insights & Performance Best Practices for Encryption & Decryption
Cryptographic algorithms execute via constant-time Web Crypto primitives. Confidential JWT tokens, private passwords, and symmetric encryption keys never leave your machine.
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