Does this tool send my data anywhere?

No. All encryption and decryption happens inside your browser using the Web Crypto API. Nothing is sent to any server, logged, or stored by this website.

What algorithm is used?

AES-256-GCM (Advanced Encryption Standard, 256-bit key, Galois/Counter Mode). The passphrase is derived into a key using PBKDF2-SHA-256 with a random 128-bit salt and 310,000 iterations.

What does the encrypted output look like?

The output is a Base64-encoded string that bundles the salt (16 bytes), IV (12 bytes), and ciphertext together. You only need this single string plus the passphrase to decrypt.

Is AES-256-GCM safe to use?

Yes. AES-256-GCM is the gold standard for symmetric authenticated encryption. It provides both confidentiality and integrity — if the ciphertext is tampered with, decryption fails with an error.

What if I lose my passphrase?

There is no recovery mechanism. If you forget the passphrase, the encrypted data cannot be decrypted. Store your passphrase securely.

Can I decrypt on another device or app?

Yes, as long as the other side implements the same format: PBKDF2-SHA-256 (310 000 iterations, 128-bit salt), AES-256-GCM with a 96-bit IV, and the same Base64 concatenation layout.

Text Encryption Tool

Encrypt or decrypt any text with a passphrase using AES-256-GCM — everything runs in your browser, nothing is sent to any server.

Plaintext

Passphrase

Keep this secret. Share it with the recipient via a separate channel.

Encrypted Output

How it works

Algorithm: AES-256-GCM
Key derivation: PBKDF2-SHA-256, 310 000 iterations
Output format: salt(16) + IV(12) + ciphertext — Base64
100% client-side — no data sent to any server

Copied!

Summary

This tool encrypts and decrypts text using the AES-256-GCM algorithm with a user-supplied passphrase. Your key is derived using PBKDF2 with a random salt and 310,000 iterations, matching current NIST recommendations. All cryptographic operations run inside your browser via the Web Crypto API — no data is transmitted or stored server-side.

How it works

Type or paste the text you want to encrypt in the input field.
Enter a strong passphrase — this is the secret you share with the recipient.
Click Encrypt to generate a Base64-encoded ciphertext containing the salt, IV, and ciphertext.
Share the encrypted output with your recipient, along with the passphrase through a separate channel.
To decrypt, paste the encrypted output into the input field, enter the same passphrase, and click Decrypt.
The original plaintext is restored instantly in the output field.

Use cases

Securely share passwords or credentials over email or chat.
Store sensitive notes in a text file or cloud document.
Exchange confidential messages without relying on a third-party service.
Protect private journal entries saved on shared devices.
Verify cryptography concepts and AES-GCM behavior for development.
Quickly encrypt API keys or tokens before committing to a notes app.

Frequently Asked Questions

Last updated: 2026-05-28 · Reviewed by Nham Vu

Text Encryption Tool

Use the Text Encryption Tool

How it works

Summary

How it works

Use cases

Frequently Asked Questions