jsonversal
Security · cryptography in your browser

Security tools that run in your browser.

No signup, no upload. Everything stays on your device — keys, secrets and passwords never leave your browser.

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Security toolkit

Cryptography & secrets, locally

Hash, encrypt and inspect security primitives — AES, bcrypt, HMAC, TOTP, JWT, X.509, CSP and more. All client-side.

Showing 18 of 18 tools

Hash Generator

Compute MD5, SHA-1, SHA-256, SHA-512 of any text.

AES Encryption / Decryption

Encrypt and decrypt text with AES using your own key. AES-GCM supported.

BCrypt Hash & Verify

Hash passwords with BCrypt (adaptive cost) and verify a hash.

HMAC Calculator

Compute HMAC-SHA256/384/512 signatures for your message and key.

Random Password Generator

Generate strong random passwords with a cryptographically secure RNG.

File Checksum Calculator

Compute SHA-256 / SHA-1 checksums of local files in your browser.

Password Strength Analyzer

Score a password and get a human-readable strength hint.

CSP Generator

Build a strict Content-Security-Policy header from toggles.

Certificate Signing Request Decoder

Decode a PEM-encoded CSR and show subject, SANs, and public key.

TOTP Authenticator

Generate 6-digit TOTP codes from a Base32 secret, RFC 6238.

Random Token Generator

CSPRNG hex / base64 / base64url / UUID tokens for API keys.

RSA Key Pair Generator

Generate RSA-OAEP key pairs and encrypt/decrypt text locally.

JWT Generator & Signer

Build and sign JWTs with HS256 / HS384 / HS512 in-browser.

X.509 Certificate Decoder

Decode PEM certificates: subject, issuer, SANs, key usage.

Hash Identifier

Identify hash formats: MD5/SHA families, bcrypt, crypt, JWT, UUID, AWS keys.

Passphrase Generator

Diceware-style memorable passphrases with entropy estimates.

Password-Based Encryption

PBKDF2 + AES-GCM encrypt/decrypt of text with a password.

Secret & API Key Scanner

Detect and redact leaked credentials in logs, configs and env dumps.

Related — from the jsonversal brand

DevOps Tools

devops — YAML/JSON, Base64, JWT, crontab.

Code Generators

codegen — .gitignore, license, CI workflow.

JSON / LLM Tools

jsonversal — UUID v7, JSON to TypeScript.