Use a strong password. Store it safely - you'll need it to decrypt.
• Uses AES-256-GCM encryption via Web Crypto API
• Password is hashed with PBKDF2 (100,000 iterations)
• All processing happens in your browser - nothing is sent to a server
• Each encryption uses a random initialization vector (IV)
• Store your password safely - it cannot be recovered
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Encrypt your data in 30 seconds
Paste sensitive text like API keys, passwords, notes, or confidential data into the input field. The tool supports any UTF-8 text including special characters, emojis, and multi-line content.
Choose a strong password (12+ characters, mixed case, numbers, symbols) to encrypt your data. The password is never stored or transmitted - only you know it. Stronger passwords = harder to crack.
Click Encrypt to generate encrypted ciphertext. The output is Base64-encoded and safe to store in text files, send via email, or paste into chat. Only someone with the password can decrypt it.
Paste encrypted text back into the tool, enter the same password, and click Decrypt to recover the original plaintext. Wrong password produces gibberish or error.
Understanding client-side encryption
Browser-based encryption uses client-side JavaScript to encrypt and decrypt text entirely in your web browser without server transmission. This approach ensures sensitive data never leaves your device in plaintext, making it safe for encrypting passwords, API keys, private notes, or confidential information before storing or sharing them. Unlike server-based encryption where you trust the service provider, client-side encryption keeps you in full control.
Modern web browsers support the Web Crypto API, a built-in cryptographic library providing industry-standard encryption algorithms like AES-GCM (Advanced Encryption Standard with Galois/Counter Mode). AES-256 is the gold standard for symmetric encryption, used by governments, banks, and security organizations worldwide. When you encrypt text with this tool, it generates a random initialization vector (IV), derives an encryption key from your password using PBKDF2 (key stretching), and encrypts the data with AES-GCM. The output includes both the IV and ciphertext, Base64-encoded for text-safe storage and transmission.
Zero-knowledge architecture: Your plaintext and password never leave your browser. Even if this website were compromised, attackers cannot access your data because encryption happens locally. The server never sees your content or password. This is fundamentally different from services that encrypt on their servers - you must trust them completely.
Offline security: After the page loads, disconnect from the internet and the tool still works. This proves no network requests are made with your data. Inspect browser DevTools Network tab while encrypting - you'll see zero uploads. Perfect for air-gapped encryption of highly sensitive data.
No account required: No registration, no login, no email verification. Paste your text, enter a password, and encrypt. No centralized database stores your encrypted data, no accounts can be hacked, no password reset mechanisms to exploit. The encrypted output is yours alone to store however you choose.
When you click Encrypt, the tool uses your password to derive a cryptographic key using PBKDF2 with 100,000 iterations. PBKDF2 is a key derivation function that makes brute-force attacks exponentially harder by forcing attackers to perform thousands of hash operations per password guess. This transforms your human-readable password into a 256-bit encryption key suitable for AES.
AES-GCM encryption then processes your plaintext with the derived key and a randomly generated 12-byte initialization vector (IV). The IV ensures that encrypting the same plaintext twice produces different ciphertexts, preventing pattern analysis. AES-GCM also provides authenticated encryption - the ciphertext includes a message authentication tag that detects tampering. If someone modifies the encrypted data, decryption fails.
The encrypted output is Base64-encoded: a text representation of binary data that's safe to copy-paste, store in JSON, send via email, or include in configuration files. Base64 uses only letters, numbers, +, /, and = characters, avoiding encoding issues in various systems.
Encryption (AES) is reversible: encrypted data can be decrypted back to original plaintext with the correct password. Use for data you need to read later (passwords you'll use, API keys for services, confidential notes).
Encoding (Base64) is reversible transformation with no security: anyone can decode Base64. It's not encryption. Use encoding only for data format conversion, never for security. This tool encodes encrypted data as Base64 for convenience, but security comes from AES encryption, not Base64.
Hashing (SHA-256, bcrypt) is one-way: impossible to reverse back to original. Use for verifying data integrity or storing passwords where you only need to check if a guess matches, never retrieve the original (user password authentication, file checksums).
Password strength is critical: AES-256 is unbreakable with current technology, but weak passwords are cracked in seconds. Use 12+ character passwords with mixed case, numbers, and symbols. Avoid dictionary words, personal info, or common patterns. Password managers generate strong random passwords.
Password storage: This tool does not store your password anywhere. You must remember it or save it securely (password manager, written down in a safe place). If you forget the password, the encrypted data is unrecoverable - there is no password reset or recovery mechanism. This is a feature, not a bug: no backdoors mean no way for attackers to bypass encryption.
Encrypted data storage: The encrypted output can be stored anywhere: cloud storage, git repositories, email, chat apps, or text files. Since it's encrypted, even if storage is compromised, attackers only get ciphertext. However, if they also capture your password (keylogger, phishing), they can decrypt it. Keep passwords separate from encrypted data.
Encrypt API keys before committing to version control: encrypt the key, commit the encrypted value, decrypt locally when needed. Prevents accidental API key exposure in public repositories. Encrypt database credentials for storage in configuration management tools. Encrypt sensitive notes or passwords for backup to cloud storage. Encrypt personal information before sending via email or chat where you don't trust end-to-end encryption.
How developers use browser-based encryption
Encrypt sensitive API keys, OAuth secrets, or credentials before committing to git repositories. Prevents accidental exposure in public or compromised repositories. Decrypt locally in your development environment.
Encrypt your master password list or password manager backup before storing in cloud storage. Adds extra layer of encryption on top of cloud provider's encryption, protecting against cloud breaches or employee access.
Encrypt database passwords, SMTP credentials, or webhook secrets in configuration files. Store encrypted values in Ansible playbooks, Terraform configs, or deployment scripts without exposing secrets in plaintext.
Encrypt passwords, credentials, or confidential information before sending via email, Slack, or SMS where end-to-end encryption isn't guaranteed. Share encrypted text and password separately for security.
Master AES-256 encryption workflow
This browser-based encryption tool uses AES-256-GCM with PBKDF2 key derivation for secure client-side encryption. All processing happens in your browser using the Web Crypto API - no server uploads, no data transmission, no account required.
Paste or type the text you want to encrypt into the plaintext input field. This can be passwords, API keys, multi-line notes, or any sensitive data. Choose a strong password (12+ characters minimum, mix of upper/lowercase, numbers, and symbols). The password is used to derive the encryption key - stronger passwords are exponentially harder to brute-force.
Click Encrypt. The tool generates a random initialization vector (IV), derives a 256-bit key from your password using PBKDF2 with 100,000 iterations, encrypts your plaintext with AES-GCM, and encodes the result as Base64. Copy the encrypted output - it looks like random characters: U2FsdGVkX1/abc123xyz789==. This encrypted text is safe to store anywhere.
Paste the encrypted text (Base64-encoded ciphertext) into the input field. Enter the same password you used for encryption. Click Decrypt. If the password is correct, you get the original plaintext. If the password is wrong, decryption fails with an error or produces gibberish.
Critical: This tool does not store your password. You must remember it or save it securely. If you forget the password, encrypted data is permanently unrecoverable - there is no password reset mechanism. This is intentional: no backdoors means no way for attackers to bypass encryption.
Write down passwords and store them securely (safe, locked drawer), use a password manager to store encryption passwords, or use a memorable passphrase (4+ random words: "correct-horse-battery-staple" style). Never save the password in the same location as the encrypted data.
Use different passwords for different encrypted data. If one password is compromised, others remain safe. Use 16+ character passwords for highly sensitive data. For shared secrets (team API keys), share the password via a different channel than the encrypted text (if you send encrypted text via Slack, send password via SMS or phone call).
Store encrypted data separately from passwords. Encrypted text can be stored in cloud storage, version control, or email safely. Passwords should be stored separately (password manager, written down, memorized). Attackers need both to decrypt.
The encrypted output includes the initialization vector (IV) and the ciphertext, both Base64-encoded. The IV is not secret - it's safe to store with the ciphertext. The IV ensures encrypting the same plaintext twice produces different ciphertexts, preventing pattern analysis attacks.
The output length is longer than input due to IV overhead, authentication tag, and Base64 encoding overhead (~33% size increase for Base64). Expect encrypted output to be 1.5-2x the size of plaintext.
Everything you need to know about encryption
Your data never leaves your browser
This encryption tool operates entirely client-side in your browser using the Web Crypto API. Your plaintext data, passwords, and encrypted output never leave your device. All encryption and decryption happen locally using JavaScript without any server communication.
The encryption algorithm (AES-256-GCM) is the same standard used by governments, militaries, and security agencies worldwide. PBKDF2 key derivation with 100,000 iterations makes password cracking exponentially harder. All cryptographic operations use native browser implementations (Web Crypto API), not custom JavaScript crypto (which is vulnerable to timing attacks).
Safe for encrypting production credentials, API keys, customer data, financial information, health records (HIPAA), payment data (PCI-DSS), or any data requiring confidentiality. Use with confidence for regulated industries, compliance requirements, or personal privacy needs.
Encryption specifications