// security tool

Encryption / Decryption Tool

Secure encryption using industry-standard algorithms. All processing happens in your browser — your data never leaves your device.

Operation

Cryptography Type

Encryption Algorithm

Message to Encrypt

Processed locally — never sent to our servers

Password / Passphrase

Use a strong password with at least 12 characters

RSA Key Management

Generate a new key pair or use existing keys. Share only your public key.

Recipient's Public Key (PEM Format)

Ask the recipient to share their public key with you

Result

Symmetric Encryption

Same key for encryption and decryption

Select Encrypt or Decrypt operation
Choose AES-256-GCM (recommended)
Enter your message and a strong password (12+ chars)
Click Encrypt — copy and share the result safely

Best for: Personal data and communication with known parties

Asymmetric Encryption

Public key encrypts, private key decrypts

Generate a key pair or use existing keys
Share your public key with the sender
To encrypt: paste recipient's public key and enter message
To decrypt: paste your private key and the encrypted data

Remember: Never share your private key under any circumstances

Symmetric

AES-256-GCMAuthenticated encryption with integrity verification

AES-256-CBCClassic block cipher mode with 256-bit security

PBKDF2Password-based key derivation with 100,000 iterations

FastIdeal for large amounts of data

Asymmetric

RSA-OAEPSecure public key encryption with optimal padding

Key Sizes2048, 3072, and 4096-bit options available

Public/PrivateEncrypt with public, decrypt with private

Secure SharingNo need to share secret keys

Privacy

Client-SideAll processing happens in your browser

No StorageMessages and keys never leave your device

Secure RandomCryptographically secure number generation

Web Crypto APIIndustry-standard browser cryptography

When to Use Which Method

Use Symmetric When:

You can securely share a password

Encrypting large amounts of data

Personal backups or storage

Communication with known parties

Use Asymmetric When:

Communicating with strangers

Can't securely share passwords

One-way secure communication

Digital signatures (future feature)

Frequently Asked Questions

Symmetric uses the same key for both encryption and decryption — faster and suitable for large data, but requires securely sharing the password. Asymmetric uses a public/private key pair — encrypt with the public key, decrypt with the private key. More secure for sharing but slower for large data.

For symmetric encryption, AES-256-GCM is recommended as it provides both confidentiality and authenticity. For asymmetric, RSA-OAEP with 2048-bit keys is the current standard — use 3072 or 4096-bit for higher security or longer-term protection.

Yes. All encryption and decryption happens locally using the industry-standard Web Crypto API. Your data never leaves your device, and we don't store any keys or messages. For extremely sensitive data, consider dedicated offline tools.

This tool uses standard formats — data encrypted here can be decrypted with other compatible tools using the same algorithms. For RSA, we use standard PEM key formats for full interoperability.

Data is unrecoverable without the correct password or private key. This is by design — strong encryption means nobody can help you recover encrypted data. Always keep secure backups of your passwords and keys.

For symmetric: share the encrypted data through any channel, but share the password through a separate secure channel — never together. For asymmetric: you can safely share encrypted data publicly — only the holder of the private key can decrypt it.