Crypto & Hashing

Cryptographic and hashing utilities: JWT decode/verify/generate, MD5/SHA hash generators, HMAC signatures, UUID generators. WebCrypto-backed where the browser supports it.

All Crypto & Hashing

• JWT Decoder Decode, verify, and generate JWTs. HS256, RS256, ES256, EdDSA support.
• Hash Generator Generate MD5, SHA-1, SHA-256, SHA-512, BLAKE2 hashes in your browser.
• HMAC Generator Compute HMAC signatures with SHA-256, SHA-512, and other digests.
• UUID Generator Generate UUID v1, v4, v7. Bulk generation up to 1,000 at a time.
• JWT Generator Generate signed JWTs with HS256/HS384/HS512, RS256, ES256. Quick payload editor.
• Secure Password Generator Cryptographically random passwords with configurable length and character classes.
• Password Strength Checker Check password entropy and crack time. Browser-only — never sent anywhere.
• Credit Card / Luhn Validator Validate credit card numbers with the Luhn algorithm. Detect card brand. Browser-only.
• IBAN Validator Validate IBAN — format, country, mod-97 checksum.
• OAuth Scope Decoder Decode OAuth scope strings for Google, GitHub, Microsoft. See what each scope grants.
• Bcrypt Hash Generator & Verifier Generate and verify bcrypt password hashes. Configurable cost factor. Browser-only.
• BLAKE3 Hash Generator BLAKE3 — fast modern hash. 256-bit output, configurable length.
• PEM ↔ DER Converter Convert X.509 certificates and keys between PEM (Base64) and DER (binary).
• Test Credit Card Number Generator (Luhn-Valid) Generate Luhn-valid test card numbers for development. Visa, Mastercard, Amex test BINs. Sandbox only.
• File Hash Calculator (SHA-256, SHA-1, MD5) Drop a file, get SHA-256 / SHA-512 / SHA-1 / MD5 hashes calculated in your browser. Verify downloads against published checksums.
• Password Leak Check (Pwned Passwords API) Check if a password appears in known data breaches using HaveIBeenPwned k-anonymity API. Password never leaves browser.
• RSA Keypair Generator (2048 / 4096-bit) Generate RSA public + private keypair in PEM format. WebCrypto, runs in browser, never sent anywhere.
• Ed25519 Keypair Generator Generate an Ed25519 public + private keypair. Modern, fast, used by SSH / GPG / JWT EdDSA.
• SSH Public Key Fingerprint Calculator Calculate the SHA-256 fingerprint of an SSH public key. Matches ssh-keygen output.
• UUIDv7 Generator (Time-Ordered) Generate UUIDv7s — time-ordered UUIDs ideal for database primary keys. Sortable, distributed-friendly.
• TOTP / 2FA Code Generator (RFC 6238) Generate TOTP 6-digit codes from a base32 secret. Live updating, like Google Authenticator. Browser-only.
• SWIFT / BIC Code Validator Validate SWIFT / BIC bank codes. Decodes bank, country, and branch.
• Test IBAN Generator (Mod-97 Valid) Generate Mod-97-valid test IBANs for development. 30+ country formats. Sandbox use only.
• WebAuthn Passkey Tester (Register + Verify) Test WebAuthn / passkey registration and assertion in your browser. No backend needed.
• UUID Validator (v1–v8, Detect Version) Validate any UUID. Detects version (1, 3, 4, 5, 6, 7, 8) and variant. Decodes timestamps from v1 / v6 / v7.
• Password Policy Builder (Regex Generator) Visually build a password policy (min length, uppercase, digit, symbol, no spaces). Generates regex, JS, and HTML pattern attribute.