Security & Encoding
Hashes, encryption, passwords and keys.
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Adler-32 Checksum Compute the Adler-32 checksum used by zlib / PNG.
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AES Encryptor / Decryptor Encrypt or decrypt text with AES-256-GCM and a passphrase.
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Apache htdigest Entry Generate an MD5 entry for an Apache .htdigest file.
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Argon2 Hash Generator Generate Argon2id password hashes with configurable parameters.
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Base58 Encoder / Decoder Encode and decode Bitcoin-style Base58.
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Base62 Encoder / Decoder Encode and decode Base62 (URL-safe alphanumeric).
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Base85 / Ascii85 Encoder Encode bytes to Base85 (Ascii85) and decode them back.
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basE91 Encoder / Decoder Compact basE91 binary-to-text encoding (~14% denser than Base64).
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Bcrypt Hash Generator Hash a password with Bcrypt or verify a hash.
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Beaufort Cipher Reciprocal Vigenère variant: encrypt and decrypt are identical.
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Bifid Cipher Polybius-based fractionating cipher (5×5 grid).
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BIP-39 Mnemonic Generate or verify a BIP-39 seed phrase.
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BLAKE2b Hasher Compute BLAKE2b cryptographic hashes (RFC 7693).
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CRC-16 / CRC-32 Calculator Compute CRC-16-CCITT and CRC-32 (IEEE 802.3) checksums.
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CSP Builder & Linter Build a Content Security Policy from checkboxes or lint an existing CSP for foot-guns.
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Diceware Passphrase Generate memorable Diceware passphrases.
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HIBP k-Anonymity Prefix Hash a password with SHA-1 and show the 5-char prefix for the HIBP range API.
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Hill Cipher (2×2) Matrix-based classical cipher with a 2×2 key matrix mod 26.
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HKDF Key Deriver Derive keys from high-entropy material using HKDF.
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HMAC Generator Compute keyed HMAC signatures (SHA-1, SHA-256, SHA-384, SHA-512).
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JWT Generator Build a signed-token preview from JSON header and payload data.
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MD5 Hash Generator Compute the MD5 hash of any text.
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Multi-Decoder Pipeline Chain base64, gzip, url and hex transforms in a single pass.
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NTLM Hash Generator Compute the NTLM (MD4 over UTF-16LE) hash of a password.
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OIDC ID Token Decoder Decode an OpenID Connect ID token and pretty-print its claims.
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One-Time Pad Generate or apply a one-time pad — XOR with a random key.
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otpauth:// URI Builder Build an otpauth:// URI from issuer, account and Base32 secret.
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Password Generator Generate strong, cryptographically-random passwords.
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Password Strength Checker Estimate password entropy and strength in real time.
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PBKDF2 Key Deriver Derive a key from a password using PBKDF2.
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PEM ↔ DER Converter Convert between PEM (base64) and DER (binary/hex) for X.509 and keys.
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PGP Encrypt / Decrypt Work with armored PGP-style text payloads in-browser.
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PGP Fingerprint Formatter Group a hex PGP fingerprint into the standard 4-/20-char layout.
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Playfair Cipher Classic 5×5 digraph substitution cipher.
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Polybius Square Cipher Substitute each letter with its row + column digits on a 5×5 grid.
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Public Suffix Lookup Find the registrable domain for any hostname using a built-in suffix list.
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QR Code Scanner / Decoder Decode QR code images back to text.
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Quoted-Printable Encoder / Decoder Encode and decode MIME Quoted-Printable.
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ROT13 / Caesar Cipher Encode or decode ROT13 and simple Caesar-shift text.
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ROT47 Cipher Reciprocal cipher over the printable ASCII range (33–126).
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RSA Key Pair Generator Generate a fresh RSA public + private key pair (PEM).
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SAML Assertion Inspector Decode and inspect a SAML 2.0 Response — raw XML, base64, or base64+deflated.
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SAML Response Decoder Base64-decode, inflate and pretty-print a SAML request or response.
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Self-Signed Certificate Generate a self-signed X.509 RSA certificate (PEM) for dev / staging.
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SHA Hash Generator Compute SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.
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SHA-3 Hasher Compute SHA3-256, SHA3-384 and SHA3-512 hashes.
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Shamir Secret Sharing Split a secret into N shares with a K-of-N threshold.
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SSH Key Generator Generate RSA or Ed25519 SSH key material for testing.
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SSH Key Inspector Inspect any OpenSSH or PEM key — type, bit length, MD5 + SHA-256 fingerprints.
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SSH known_hosts Parser Parse known_hosts entries: host pattern, key type and SHA-256 fingerprint.
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SSL Certificate Decoder Paste a PEM-encoded SSL certificate to inspect its fields.
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Subresource Integrity Hash Generate a sha256/384/512-prefixed SRI hash for a file or text.
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TOTP Code Generator Generate a Time-based One-Time Password (RFC 6238) — SHA-1, SHA-256 or SHA-512.
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Trifid Cipher Fractionating cipher over a 3×3×3 cube (26 letters + '+').
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UUID to Bytes Converter Convert UUID values to byte-array notation.
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XOR Cipher Apply a repeating-key XOR to text or bytes.