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Encrypt Text & Files (AES)

Protect secret notes and sensitive files with a password using strong AES-256 encryption, then share them safely — only someone with the password can open them.

100% freeRuns in your browserNo sign-up
Data cannot be recovered if you forget the password — keep it safe.
Result

Real AES-256 encryption

This tool uses AES-256-GCM, the same standard used by banks, governments and secure messaging apps. The encryption key is derived from your password with PBKDF2 (250,000 iterations, SHA-256, random salt), making brute-force guessing slow and expensive. GCM mode also detects any tampering with the ciphertext.

How to use it

Encrypting text

  1. Enter a strong password — you can create one with the Password Generator.
  2. Type your secret text and click “Encrypt”.
  3. Copy the encrypted text (it starts with ABC1:) and send or store it anywhere.
  4. To decrypt, paste the encrypted text, enter the same password and click “Decrypt”.

Encrypting a file

Switch to “Encrypt file”, enter a password and choose any file (photo, PDF, document…). An encrypted .abcenc file downloads, with the original filename stored inside. To restore it, choose the encrypted file with the same password and the original downloads.

Why encrypt your data?

  • Share sensitive information such as account numbers or credentials over insecure channels.
  • Store secret notes in cloud services without the provider being able to read them.
  • Protect personal documents before copying them to a USB stick that could be lost.

Important warnings

  • Passwords can't be recovered: there's no backup or back door. If you forget it, nobody — including us — can decrypt your data.
  • Send the password through a different channel from the encrypted message.
  • Longer, more random passwords mean stronger protection; use at least 12 characters.
  • Files encrypted here use a dedicated format and can only be opened with this tool.

🔒 Your text, files and passwords never reach a server — every encryption and decryption happens in your browser via the Web Crypto API.

Frequently Asked Questions

Is the encryption really secure?

Yes — AES-256-GCM with PBKDF2 at 250k iterations, both globally recommended standards. Ultimate security depends on password strength.

What if I forget the password?

The data cannot be recovered. That's by design in strong encryption, so store your password safely.

Can I decrypt on another device?

Yes. Open this page on any device, paste the text or choose the encrypted file, and enter the password.

What is the maximum file size?

It depends on your device memory; files up to several hundred megabytes usually work on computers.

Why is the output different each time?

A random salt and IV are used every time, so identical messages never produce identical ciphertext.

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