Security Tools
Generate a SHA-256 hash, decode a JWT header or encode data in Base64 — without installing anything or trusting a web server. The security utilities cover hashes, encodings and classic ciphers like Caesar and Vigenère, handy for debugging, verification and learning how encryption works. All computation happens client-side, so whatever you paste is never transmitted.
19 tools, ready when you are
- Base64 Encoder & Decoder Encode text to Base64 or decode Base64 back to text instantly. Security
- Hash Generator Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly. Security
- JWT Decoder Decode JSON Web Tokens and inspect header, payload, and expiry. Security
- Caesar Cipher Encrypt and decrypt text with a Caesar (shift) cipher. Security
- HMAC Generator Generate HMAC-SHA256/SHA-1/SHA-384/SHA-512 codes from a message and secret key. Security
- Vigenère Cipher Encrypt and decrypt text with a Vigenère cipher using a keyword. Security
- Hash Batch Hash a whole list of strings with SHA-1, SHA-256, SHA-384, or SHA-512 in one click. Security
- Base64 Batch Base64-encode or decode a whole list of strings in one click. Security
- Ascii85 Encoder & Decoder Encode text to Ascii85 (Base85) or decode Ascii85 back to text instantly. Security
- Hex Encoder & Decoder Encode text to hexadecimal or decode hex back to text, with 0x prefix and spacing options. Security
- Base32 Encoder & Decoder Encode text to Base32 (RFC 4648) or decode Base32 back to text instantly. Security
- ROT13 Encoder & Decoder Encode or decode text with ROT13, the self-inverse Caesar shift of 13. Security
- Atbash Cipher Encrypt and decrypt text with the Atbash (reverse-alphabet) cipher. Security
- Checksum Calculator Compute CRC-32, Adler-32 and FNV-1a checksums of any text, in hex and decimal. Security
- Hash Compare Compare two hashes side by side and get an instant match or mismatch verdict. Security
- Caesar Shift Detector Break a Caesar cipher: all 25 shifts tried and scored for English-ness, best first. Security
- XOR Cipher Encrypt or decrypt text with repeating-key XOR, output as hex or base64. Security
- Byte Frequency Analyzer Break text into its UTF-8 bytes: distribution table, printable/control/high-byte split and Shannon entropy. Security
- Columnar Transposition Cipher Encrypt or decrypt text with the classic keyword-driven columnar transposition — characters rearranged, never substituted. Security
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