Text Tool Suite Logo

Secure Text Encryptor (AES-256)

Encrypt and decrypt messages with a password using AES-256-GCM. Everything runs locally in your browser (no uploads). Copy URL-safe ciphertext or generate a share link. The password is never included in the link.

How to Use This Tool:

  • This tool uses strong AES-256 encryption. Your data is encrypted in your browser and is never sent to any server.
  • To Encrypt: Type your message and a strong password. Choose whether to create a reusable secret or a shareable link.
  • To Decrypt: Use this section to decrypt reusable secrets. Shareable links must be opened directly.
  • Warning: If you forget your password, your data cannot be recovered.

1. Encrypt Message

2. Decrypt Reusable Message

TL;DR — encrypt text with a password, copy URL‑safe ciphertext or a link

Paste a message, set a strong password, and click Encrypt. The tool uses AES‑256‑GCM (key from PBKDF2‑SHA‑256, 250k iterations) in your browser. Copy the URL‑safe ciphertext or generate a shareable link. No uploads, ever.

Text Encryptor – Encrypt Messages with AES-256-GCM Online Free

Encrypt any text with a password using AES-256-GCM encryption in your browser. Generate a shareable encrypted link with the ciphertext embedded — password never included. No uploads, no account, no tracking. Type a message, choose a password, and this tool turns it into compact, URL‑safe ciphertext using the Web Crypto API — no servers, no sign‑in.

You can copy the encrypted text for reuse or generate a shareable link. The link contains only the ciphertext; the password is never embedded. For developer workflows, pair this with Hash Generator to build strong passphrases, or URL Encoder/Decoder when you need to move secrets through query strings or forms.

Under the hood: PBKDF2‑SHA‑256 (250k iterations) stretches your password with a 16‑byte salt into a 256‑bit key; AES‑GCM encrypts with a fresh 12‑byte IV and produces an authentication tag for integrity. Output is URL‑safe Base64, so it drops neatly into chats, notes, or short links.

When to use message encryption

Online text encryption is useful in several everyday situations: sharing sensitive notes, API keys, or passwords over chat or email where end-to-end encryption isn't guaranteed; storing sensitive information in public or shared notes apps; sending private messages when end-to-end encrypted apps aren't available; and keeping temporary secrets in places like GitHub issues, Slack, or Notion where you control who has the decryption password. The rule of thumb: share the ciphertext through one channel and the password through a completely separate one.

How to encrypt & decrypt text

  1. Encrypt: Enter your message and a strong password. (Optional) check "Create a shareable link." Click Encrypt and copy the result.
  2. Share: Send the ciphertext or link. Share the password via a different channel—never in the same message.
  3. Decrypt: Paste the encrypted text, enter the password, and click Decrypt to reveal the message.

Key features

  • AES‑256‑GCM encryption with PBKDF2‑SHA‑256 (250k iterations, salted)
  • 100% client‑side — your text never leaves the browser
  • URL‑safe Base64 output; optional shareable link (no password in link)
  • Copy buttons for encrypted/decrypted text; clear error messages
  • Works over HTTPS with the Web Crypto API

Tips

  • Use a long passphrase (four or more random words is a good baseline).
  • Share the password out‑of‑band (different app, channel, or a call).
  • If you forget the password, recovery is not possible — keep a safe copy.
  • For archival, store ciphertext in a password manager or secure notes app.
  • Generate passphrases with the Hash Generator and URL‑encode when needed.

Frequently asked questions

Is my text uploaded anywhere?
No. Everything runs locally in your browser using the Web Crypto API—nothing is uploaded.
What crypto does this use?
PBKDF2‑SHA‑256 (250,000 iterations) derives a 256‑bit key from your password and a random 16‑byte salt. AES‑256‑GCM encrypts with a fresh 12‑byte IV and includes an authentication tag to detect tampering. Output is URL‑safe Base64.
What’s the difference between encrypted text and the shareable link?
The encrypted text is just ciphertext. The shareable link embeds only that ciphertext in the URL—never the password. Always share the password separately.
What if I forget the password?
There’s no backdoor. Without the correct password, the data cannot be recovered.
How should I store ciphertext for later?
Save it in your password manager or a secure note. Anyone with the ciphertext and correct password can decrypt it using this page.
How do I encrypt a message online with a password for free?
Type your message, enter a strong password, and click Encrypt. Copy the ciphertext or use the share link. The recipient pastes the ciphertext, enters the same password, and clicks Decrypt. No account or software needed.
Is AES-256 encryption safe for sharing private messages?
AES-256-GCM is considered military-grade encryption and is safe for sharing private messages. The security depends on using a strong, unique password and sharing it through a different channel than the ciphertext — never include the password in the same message.
Can I share an encrypted note with someone online?
Yes. After encrypting, click Share Link to get a URL containing only the ciphertext. Send the link to the recipient and share the password separately via a different channel (call, SMS, etc.). The password is never embedded in the link.

Related tools

Hash Generator · URL Encoder/Decoder · Regex Tester · Advanced Text Cleaner