devtoken.tools

Free, client-side security & developer tools
// no backend · no tracking · no accounts

🔒 100% client-side ⚡ No sign-up required 🛠 Built for developers 🔍 Open to inspect
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Your data never leaves your browser Every tool on this site runs entirely in your browser using standard Web APIs. Nothing is sent to a server. No logs, no analytics on your input, no storage. You can inspect the source of any page to verify this.

// Tokens & Authentication

🔑 JWT Decoder & Auditor Decode JSON Web Tokens and audit them for security issues — weak algorithms, missing claims, expiry. tokens · security 🔐 HMAC Generator Generate HMAC signatures with a shared secret using SHA-256, SHA-384, or SHA-512. tokens · signing

// Cryptography & Hashing

# SHA Hash Generator Generate SHA-256, SHA-384, and SHA-512 hashes from any text input using the Web Crypto API. crypto · hashing 🔑 Password Entropy Calculator Visual strength meter with crack-time estimates for online, offline fast-hash, and slow-hash scenarios. crypto · passwords

// Encoding & Conversion

⇄ Base64 Encoder / Decoder Encode or decode Base64 with a URL-safe variant toggle. Works with text and binary data. encoding · conversion 🕐 Unix Timestamp Converter Convert between Unix epoch timestamps and human-readable dates across any timezone. encoding · time ⬡ UUID v4 / v7 Generator Generate UUIDs in bulk. Supports v4 (random) and v7 (time-ordered). Copy all with one click. encoding · identifiers

// Network & Infrastructure

🌐 CIDR Calculator Calculate subnet range, broadcast address, host count, and netmask from any CIDR notation. network · subnets 📋 HTTP Header Analyser Paste raw HTTP response headers and get security-focused annotations — HSTS, CSP, X-Frame-Options, and more. network · security 🛡 CSP Builder Interactively build a Content-Security-Policy header string using a checkbox-driven UI. network · headers

// Formatting & Testing

{ } JSON Formatter & Validator Pretty-print or minify JSON, with syntax error highlighting and clear line-level feedback. format · validate .* Regex Tester Live regex match highlighting with named group display, flag toggles, and match count. format · testing