Encryption Tool — AES-256 Browser-Based
Encrypt and decrypt text using AES-256-GCM, entirely in your browser. Your data never leaves your device. Free and secure.
Everything runs in your browser. Your data never leaves your device.
Text Encryption & Decryption Tool
Encrypt and decrypt text using industry-standard algorithms directly in your browser. All cryptographic operations happen client-side — your data never leaves your device, ensuring complete privacy.
Supports AES-256-GCM, one of the strongest symmetric encryption standards used by governments and enterprises worldwide. Simply enter your plaintext, choose a passphrase, and get an encrypted output you can safely share.
Understanding encryption is essential for anyone handling sensitive data. AES (Advanced Encryption Standard) works by applying multiple rounds of substitution and permutation to transform plaintext into ciphertext. Without the correct key, reversing this process is computationally infeasible.
For password security, pair this tool with our Password Generator to create strong encryption keys. For hashing rather than encryption, check our Hash Generator — hashing is one-way and ideal for verifying data integrity.
While this tool focuses on symmetric encryption (same key for encrypt and decrypt), asymmetric encryption (public/private key pairs) is used for secure communication where parties cannot share a secret key in advance. For verifying data integrity without encryption, our Hash Generator creates one-way fingerprints of your data.
How the Encryption Tool Works
- Enter the text you want to encrypt or paste encrypted text to decrypt
- Choose an encryption algorithm (AES-256-GCM recommended)
- Enter a strong passphrase — this is your encryption key
- Click Encrypt or Decrypt to process your text
- Copy the result — encrypted output is Base64-encoded for safe sharing
Understanding Encryption
Encryption transforms readable text (plaintext) into unreadable ciphertext using a mathematical algorithm and a key. Only someone with the correct key can reverse the process (decryption). AES-256-GCM, the default algorithm in this tool, is the same standard used by banks and government agencies. The '256' refers to the key length in bits — with 2^256 possible keys, brute-force attacks are impossible with current or foreseeable technology. GCM (Galois/Counter Mode) adds authenticated encryption, which means it also detects if the ciphertext has been tampered with.
When to Use Encryption
Use encryption when sharing sensitive information through insecure channels — email, chat, or cloud storage. Encrypt passwords, API keys, personal data, or confidential documents before transmitting them. This is also useful for storing sensitive notes locally. Remember: encryption protects data in transit and at rest, but both sender and receiver need to know the passphrase.
Common Use Cases
- •Share API keys or database passwords securely with team members via email or Slack
- •Encrypt sensitive notes before saving them in cloud storage like Google Drive or Dropbox
- •Protect confidential client information when sending via unencrypted channels
- •Generate a strong passphrase using our Password Generator Strong Password Generator — Secure & Random
- •Create secure backup copies of sensitive configuration files
Expert Tips
- ✱Use a passphrase of at least 16 characters — combine random words for both strength and memorability
- ✱Never share the passphrase through the same channel as the encrypted message
- ✱For truly sensitive data, consider using different passphrases for different recipients
- ✱AES-256-GCM is the recommended algorithm — it provides both confidentiality and integrity verification
Frequently Asked Questions
- No. All encryption and decryption happens entirely in your browser using the Web Crypto API. Your plaintext, ciphertext, and passphrase never leave your device. You can verify this by disconnecting from the internet and using the tool offline.
- If you lose the passphrase, the encrypted data cannot be recovered. There is no 'forgot password' option with symmetric encryption — the passphrase IS the key. Store passphrases securely in a password manager.
- Encryption is reversible — you can get the original text back with the key. Hashing is one-way — you cannot reverse a hash back to the original input. Use encryption when you need to read the data again later. Use hashing for passwords and data integrity verification.
Is my data sent to a server?▾
What happens if I lose my passphrase?▾
What is the difference between encryption and hashing?▾
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