AES (Advanced Encryption Standard) is a symmetric block cipher published by the National Institute of Standards and Technology (NIST) in 2001. AES uses the same key for both encryption and decryption and supports 128, 192, and 256-bit key lengths. This tool uses AES-GCM mode, which provides authenticated encryption — it encrypts data and appends an authentication tag to ensure the data has not been tampered with.
Base64 is an encoding scheme, not an encryption scheme. It simply converts binary data into printable ASCII characters that anyone can decode, providing no security. AES is a real encryption algorithm that requires a key to decrypt and provides data confidentiality. In web development, Base64 is commonly used to transmit binary data in text environments, while AES is used to protect the confidentiality of sensitive data.
Hash functions map inputs of arbitrary length to a fixed-length output (digest) with the property of being one-way — it is practically impossible to reverse-engineer the original data from its hash value. MD5 produces a 128-bit digest, while SHA256 produces a 256-bit digest. Hash functions are mainly used for data integrity verification, password storage (with salt), and digital signatures. Note: MD5 has been found vulnerable to collision attacks; SHA256 or stronger algorithms are recommended for security-critical applications.
This tool supports 12 common text processing algorithms. Here is a detailed guide:
AES Encrypt & Decrypt: Select "AES Encrypt" from the dropdown, enter the plaintext in the input box, and enter an encryption password (recommended 8+ characters with mixed case and numbers). Click "Encrypt" to generate a base64-formatted ciphertext. To decrypt, select "AES Decrypt", paste the ciphertext, and enter the same password. Note: The password must be kept secret. If lost, the ciphertext cannot be recovered.
Base64 Encode & Decode: Select "Base64 Encode", enter any text (supports all Unicode characters), and the tool will encode it into a Base64 string. Select "Base64 Decode" to reverse the operation. Base64 is commonly used to transmit binary data in URLs, JSON, or emails.
Hash Calculation: Select "MD5 Hash" or "SHA256 Hash", enter text, and get a fixed-length hash value. Hashing is one-way and cannot be reversed. You can use it to verify file integrity or compare whether two pieces of text are identical.
Other Tools: ROT13 is a simple substitution cipher; URL encoding handles special characters in URLs; text reverse and binary conversion are for specific data processing needs. All operations are performed locally in your browser.
Secure Temporary Messaging: Encrypt sensitive information like IDs or passwords temporarily when sending through public channels. The recipient can decrypt with the same password. Note: This is for temporary transmission only; use professional encryption software for long-term storage.
API Development & Debugging: When developing RESTful APIs, you often need to Base64-encode or URL-encode request parameters. This tool helps developers quickly verify encoding results and debug issues caused by encoding mismatches.
Data Integrity Verification: Use MD5 or SHA256 hash values to quickly verify whether a file or text has been tampered with during transmission. For example, after downloading software, compute its SHA256 value and compare it with the official published hash to confirm the file is intact.
CTF Competitions & Cryptography Learning: ROT13 and Base64 are common encodings in CTF (Capture The Flag) competitions. This tool can serve as an introduction to cryptography, helping you understand the basics of symmetric encryption, hash functions, and encoding schemes.
Symmetric vs Asymmetric Encryption: Symmetric encryption (like AES) uses the same key for both encryption and decryption. It is fast and suitable for large data volumes. Asymmetric encryption (like RSA) uses a public key to encrypt and a private key to decrypt. It is more secure but slower, and is commonly used for key exchange and digital signatures. In practice, both are often combined: asymmetric encryption is used to transmit the symmetric key, and symmetric encryption is used for the actual data.
What is a Salt? A salt is a random string added before hashing a password to prevent rainbow table attacks. Even if two users have the same password, the resulting hashes will differ because of different salts. Modern password storage solutions (like bcrypt, scrypt, and Argon2) automatically handle salting and iteration counts.
HTTPS vs End-to-End Encryption: HTTPS encrypts data at the transport layer using TLS/SSL, preventing eavesdropping by intermediaries. However, the server can still read the plaintext. End-to-end encryption (like the Signal protocol) ensures that only the communicating parties can decrypt the data — even the server cannot read it. AES can serve as a core algorithm for end-to-end encryption.
AES is a symmetric encryption algorithm that requires a password to decrypt, providing real data confidentiality. Base64 is an encoding scheme that anyone can decode, offering no security, and is only used for data format conversion.
No. MD5 and SHA256 are one-way hash functions. In theory, it is impossible to reverse-engineer the original text from its hash value. They are mainly used for data integrity verification, not for protecting data confidentiality.
Yes. The AES encryption uses the Web Crypto API with full UTF-8 support, including Chinese, Emoji, and all Unicode characters. Base64 and URL encoding also support non-ASCII characters.
No. This tool runs entirely in your browser. All encryption and decryption operations are performed locally on your device. Your data never leaves your browser, ensuring complete privacy.
Yes. As long as you use the same password and algorithm parameters, you can decrypt the ciphertext on any tool that supports AES decryption. The ciphertext is in base64 format for easy transmission and storage.
ROT13 is a simple substitution cipher that replaces each letter with the 13th letter after it in the alphabet. Since the alphabet has 26 letters, ROT13 encryption and decryption use the same operation. Applying ROT13 twice restores the original text.
Unfortunately, if you lose the password, the ciphertext cannot be decrypted. AES encryption's security relies entirely on the password. We recommend using a password manager to store your encryption passwords securely.
MD5 is fast to compute, making it vulnerable to brute-force and rainbow table attacks. Additionally, MD5 has known collision vulnerabilities. For password storage, use purpose-built slow hash algorithms like bcrypt, scrypt, or Argon2.