JSON Beautifier & Viewer
Format, validate, and visualize JSON with a collapsible tree view. Syntax highlighting and easy copy/download.
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Free Tools
Useful utilities for security professionals, completely free.
Swagger Scoper
Analyze Swagger/OpenAPI specs to count HTTP methods and parameters for security assessment planning.
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Burp to OpenAPI Converter
Turn a Burp Suite XML export into an OpenAPI 3.0 spec — runs entirely in your browser.
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Alternative IP Representations
Convert IPv4 addresses to decimal, hex, octal, and mixed-base formats for security testing and WAF bypass research.
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Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 strings instantly. Supports UTF-8, client-side only.
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Hash Generator & Identifier
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes or identify unknown hash types from their pattern.
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JWT Decoder
Decode JSON Web Tokens to inspect header, payload, and signature. Check expiration and claims.
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TOTP Authenticator
Generate Time-based One-Time Password codes from Base32 secret keys. Auto-refreshes every 30 seconds.
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Google Gemini API Key Tester
Validate your Google Gemini API key, test authentication, and view all available models with token limits.
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Well-Known Ports Reference
Searchable reference of TCP/UDP ports with security-focused notes — covering web, databases, ICS/SCADA, and out-of-band management.
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CORS Tester
Fire a real cross-origin request from your browser and see exactly which headers are exposed, plus a curl-equivalent for full-fidelity testing.
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AES Encrypt & Decrypt
AES-GCM (recommended) or AES-CBC at 128/192/256 bits via the Web Crypto API. Keys, IVs, and plaintext stay in your browser.
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SSL/TLS Certificate Decoder
Paste an X.509 PEM and read every field — Subject, Issuer, validity, SANs, key usage, and SHA-256/SHA-1 fingerprints.
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LLM Token Counter
Exact tokenizer for OpenAI (GPT-4o, GPT-4, GPT-3.5, o1/o3); calibrated estimates for Claude, Gemini, and Llama. Lazy-loaded for speed.
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LLM Red-Team Reference
Catalogue of 12 documented LLM jailbreak and prompt-injection technique families with examples, defences, and academic references.
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CVSS Calculator
Compute CVSS 3.1 and 4.0 scores by selecting metrics or pasting a vector. Same engine Vulnsy uses inside customer pentest reports.
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UUID Generator
Generate v4, v7, v1, or v5 UUIDs in batch, or inspect an existing UUID to see version, variant, and embedded timestamp.
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SAML Decoder
Decode SAMLRequest / SAMLResponse messages (base64, optionally DEFLATE-compressed) into readable XML with key fields surfaced.
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cURL Converter
Paste a curl command, get equivalent Python, JavaScript fetch, Node.js, PHP, or Go code instantly.
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