Question 1

Is this encryption tool free?

Accepted Answer

Yes, completely free with no signup, no ads, and no usage limits.

Question 2

Does my data get sent to any server?

Accepted Answer

No. All encryption and decryption runs entirely in your browser using the Web Crypto API. Your plaintext, keys, and ciphertext never leave your device.

Question 3

What encryption algorithms are supported?

Accepted Answer

Symmetric: AES-256-GCM, AES-256-CTR, ChaCha20-Poly1305. Asymmetric: RSA-OAEP (2048 & 4096-bit), X25519 ECDH, X448 ECDH. Utilities: secp256k1 sign/verify, Base58 encode/decode.

Question 4

What is the difference between V1 and V2 symmetric encryption?

Accepted Answer

V1 derives a key from your password using PBKDF2 (100,000 iterations) and outputs hex. V2 uses the raw key bytes directly (AES-256-GCM) and outputs Base64, making it compatible with server-side encryption using the same key.

Question 5

What is AES-256-GCM and why should I use it?

Accepted Answer

AES-256-GCM is an authenticated encryption algorithm. It simultaneously encrypts your data and produces an authentication tag, meaning any tampering with the ciphertext is detected on decryption. It is used in TLS 1.3, WhatsApp, and iMessage.

Question 6

Can I use this tool to decrypt data encrypted by my server?

Accepted Answer

Yes. Use the V2 mode and enter your server's 64-character hex encryption key. V2 uses the same AES-256-GCM format (Base64: IV + AuthTag + Ciphertext) as the server-side crypto utility.

Encryption Tool