Crypto & Security Tools
Generate RSA/ECDSA key pairs, encrypt files with AES, calculate hashes, and perform cryptographic operations locally in your browser. Zero server uploads, complete privacy.
Crypto & Security
18 tools in 6 subcategories
Key Generators
RSA/ECDSA Key Generator
Generate cryptographically secure RSA and ECDSA public/private key pairs using the Web Crypto API - Free online key generator
Cryptographically Secure Password Generator
Generate high-entropy passwords with browser cryptographic randomness and policy controls - Free secure password generator
UUID / GUID Batch Generator
Generate batches of up to 10,000 cryptographically secure UUID v4 (random) or UUID v7 (time-ordered) identifiers in your browser - Free online UUID generator
Token Tools
JWT Builder
Construct a JWT token from header and payload JSON with a signing secret - supports HS256, RS256, ES256, and more. Free online JWT builder.
JWT Debugger & Signature Verifier
Decode JWT claims and verify HS/RS/ES signatures in-browser with shared-secret and public-key workflows - Free online JWT debugger
TOTP/2FA Authenticator & Token Generator
Generate RFC6238 TOTP codes from Base32 secrets or otpauth URIs with algorithm and period controls - Free online TOTP generator
Hash Tools
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 checksums for files up to 2GB or any text string - Free online hash generator
Bulk File Hash Generator
Upload multiple files and compute SHA-1, SHA-256, SHA-384, and SHA-512 checksums for all of them at once with real-time progress tracking and CSV/JSON export.
Checksum File Verifier
Upload a file and its checksum file (.sha256, .md5, .sfv) to verify integrity. Parses standard hash file formats, computes matching hashes, and reports pass/fail for each entry. Free online checksum file verifier.
Inspectors
SSL Certificate Decoder & Inspector
Decode PEM certificates to inspect issuer, subject, validity, SAN entries, and SHA-256 fingerprint locally - Free certificate inspector
CSR Decoder
Decode and validate PEM-encoded PKCS#10 Certificate Signing Requests - extract subject, public key algorithm and key size, Subject Alternative Names (SANs), challenge password, and verify the self-signature using Web Crypto. 100% client-side. Free online CSR decoder.
Utilities
QR Code Encoder & Decoder
Generate custom QR codes from text or URLs and decode QR images locally in your browser with private client-side processing - Free online QR tool
Barcode Generator
Generate Code 128, EAN-13, and QR barcodes and download as SVG or PNG - free online barcode generator with custom colors and sizes
HMAC Generator
Generate HMAC-SHA-256, SHA-384, SHA-512, and SHA-1 signatures for API authentication, webhook verification, and JWT tokens - Free online HMAC generator
Base64/Hex File Encoder & Decoder
Convert binary files to Base64 or Hex strings and decode text back into downloadable files locally in your browser - Free online Base64/Hex file converter
Password Hash Identifier
Identify the algorithm used in a hash string - bcrypt, Argon2, MD5, SHA-256, NTLM, PBKDF2, and 20+ more with confidence scoring - Free online hash identifier
ROT47 Encoder Decoder
Encode and decode text using the ROT47 substitution cipher - shifts all 94 printable ASCII characters (! through ~) by 47 positions. Self-inverse, instant, browser-only. Free online ROT47 encoder decoder.