Encode and decode text or files. 100% free, runs locally in your browser—nothing is uploaded to our servers.

RFC 4648 text encode/decode (commonly used for OTP/key display). 100% free, runs locally in your browser—nothing is uploaded to our servers.

Common encode/decode scenarios. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Convert between UTF-8 bytes and hexadecimal. 100% free, runs locally in your browser—nothing is uploaded to our servers.

HTML entities and JSON string escaping. 100% free, runs locally in your browser—nothing is uploaded to our servers.

MD5, SHA-256, and other checksums and digests. 100% free, runs locally in your browser—nothing is uploaded to our servers.

HMAC-SHA1/256/384/512 in hexadecimal. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Passphrase + PBKDF2 key derivation, local encrypt/decrypt. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Configurable length and charset, crypto-secure random. 100% free, runs locally in your browser—nothing is uploaded to our servers.

IEEE polynomial checksum (hexadecimal). 100% free, runs locally in your browser—nothing is uploaded to our servers.

Bitcoin alphabet text encode/decode. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Generate PNG from text, URL, WiFi, etc. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Parse QR code from image (jsQR). 100% free, runs locally in your browser—nothing is uploaded to our servers.

Byte-wise XOR with cycling key, output as hex or Base64. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Classic polyalphabetic cipher for English letter encrypt/decrypt. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Generate keys via Web Crypto, asymmetric encrypt/decrypt for short text. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Bcrypt hash generation and verification. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Chinese SM3 hash algorithm. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Chinese SM4 symmetric encryption/decryption. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Chinese SM2 asymmetric encryption. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Analyze password complexity, show strength bar. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Generate Wi-Fi connection QR code from SSID, password, encryption. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Generate BIP39 mnemonic for Bitcoin/Ethereum wallets. 100% free, runs locally in your browser—nothing is uploaded to our servers.

Generate RSA public/private key pair (PEM format). 100% free, runs locally in your browser—nothing is uploaded to our servers.

Classic substitution cipher with custom shift encrypt/decrypt.

DES and Triple DES encryption/decryption in browser.

RIPEMD-160 hash computation, commonly used in blockchain.

BCC and LRC checksum calculation for industrial communication.

Fix ISO-8859-1 misinterpreted garbled text to UTF-8.

Socialist core values encoding / fun Emoji encryption.

RC4 stream cipher encryption and decryption with UTF-8/Hex/Base64 encoding support. 100% free, runs locally in your browser—nothing is uploaded to our servers.