What encryption algorithms are available?

We offer three military-grade encryption modes: AES-256-GCM (recommended, single operation authenticated encryption), AES-256-CTR + HMAC-SHA256 (stream cipher with dual-key authentication), and AES-256-CBC + HMAC-SHA256 (classic block cipher with authentication). All use PBKDF2 with 100,000 iterations for key derivation.

Which encryption mode should I choose?

For most users, we recommend AES-256-GCM - it's fast, secure, and widely used in TLS 1.3. Choose CTR+HMAC for explicit key separation, or CBC+HMAC for maximum compatibility with legacy systems. All three modes provide equivalent security when used correctly.

Does this encryption tool work offline?

Yes! Once the page is loaded, the encryption tool works completely offline since all processing happens in your browser using the native Web Crypto API.

What browsers are supported?

Our encryption tool works on all modern browsers that support the Web Crypto API: Chrome 37+, Firefox 34+, Safari 11+, Edge 12+, and their mobile versions. Internet Explorer is not supported.

Free Online Encryption Tool

Encrypt and decrypt text online with military-grade AES-256 encryption. Your data is fully protected and never stored on our servers.

No registration required • No file size limits • Works on all browsers • Completely free

🔐 Your Data is Fully Protected

Your data is protected using military-grade AES-256 encryption. We never store your data, passwords, or encrypted results anywhere on our website or in any database. All processing is secure and data is immediately discarded after encryption/decryption.

Choose Encryption Method

Recommended

AES-256-GCM

Military-grade authenticated encryption with 256-bit keys

256-bit encryption
Built-in authentication
PBKDF2 key derivation
12-byte random IV

Use AES-256-GCM

Modern

XChaCha20-Poly1305

Modern stream cipher with Argon2id key derivation

256-bit encryption
Poly1305 authentication
Argon2id KDF
24-byte extended nonce

Use XChaCha20-Poly1305

Secure

AES-256-CTR + HMAC

Stream cipher encryption with separate HMAC authentication

256-bit encryption
HMAC-SHA256 auth
Key separation
16-byte random IV

Use AES-256-CTR + HMAC

Classic

AES-256-CBC + HMAC

Classic block cipher with separate HMAC authentication

256-bit encryption
HMAC-SHA256 auth
PKCS7 padding
16-byte random IV

Use AES-256-CBC + HMAC

Why Use Our Free Online Encryption Tool?

Maximum Privacy

Your data never leaves your device. We can't see it, and neither can anyone else.

Instant & Offline

Works instantly with no upload delays. Even works offline once the page is loaded.

Industry Standard

Uses proven cryptographic standards trusted by security professionals and governments worldwide.

Frequently Asked Questions About Online Encryption

Is this encryption tool free to use?

Yes, our encryption tool is completely free with no limits. There's no registration required, no hidden fees, and no premium tiers. You can encrypt and decrypt as much text as you need.

Is my data safe with this encryption tool?

Absolutely. Your data is fully protected using military-grade AES-256 encryption. We never store your data, passwords, or encrypted results anywhere on our servers or in any database. All data is processed securely and immediately discarded after encryption/decryption is complete.

What encryption algorithm does this tool use?

We use AES-256-GCM (Advanced Encryption Standard with Galois/Counter Mode), which is military-grade encryption used by governments and security professionals worldwide. Keys are derived using PBKDF2 with 100,000 iterations for maximum security against brute-force attacks.

Does this encryption tool work on all browsers?

Yes! Our encryption tool works reliably on all modern browsers including Chrome, Firefox, Safari, Edge, and mobile browsers. Server-side processing ensures consistent results across all platforms and devices.

Can you recover my password if I forget it?

No, we cannot recover your password. We never store your passwords or encrypted data, so there is no way for anyone to decrypt your content without the original password. Please store your passwords securely in a password manager.

What can I use this encryption tool for?

You can use our free online encryption tool to securely encrypt private messages, passwords, notes, sensitive documents, API keys, personal information, or any text you want to keep confidential. It's perfect for securely sharing sensitive information via email or messaging apps.

Secure Text Encryption Made Simple

Looking for a free online encryption tool that respects your privacy? All Convert's encryption tools use industry-standard AES-256 encryption — the same encryption standard used by banks, governments, and security experts worldwide.

Your data is fully protected with military-grade encryption and we never store your sensitive information anywhere. Whether you're encrypting passwords, private messages, or confidential notes, you can trust that your data remains completely private and is immediately discarded after processing.

Our tool features a built-in secure password generator using cryptographically secure random numbers, making it easy to create strong encryption passwords. Start encrypting your text now — no account needed, no software to install, and works reliably on any device with a modern browser.