A defensive toolkit that runs in your browser
Analysis and developer utilities for learning. No exploitation tooling, no data leaves your device.
Web Security
HTTP Header Analyzer
Paste raw response headers and get a defensive posture review.
Open toolSecurity Header Checker
Checklist view of the headers a modern site should ship.
Open toolURL Analyzer
Break a URL into scheme, host, path, query and fragment.
Open toolCSP Analyzer
Break down a Content-Security-Policy and flag weak directives.
Open toolCookie Flag Analyzer
Review Set-Cookie headers for HttpOnly, Secure and SameSite.
Open toolrobots.txt Analyzer
Parse robots.txt rules and spot sensitive path disclosure.
Open toolDeveloper Security
JWT Decoder
Inspect header and payload claims of a JSON Web Token.
Open toolJSON Formatter
Validate and pretty-print JSON payloads.
Open toolBase64 Encoder / Decoder
Two-way Base64 conversion for artifacts and CTF work.
Open toolHash Identifier
Guess the hash family from length and character set.
Open toolPassword Strength Checker
Estimate entropy and get concrete improvement advice.
Open toolHTML Entity Escaper
Escape or unescape HTML entities for safe output encoding.
Open toolRegex Tester
First line is the pattern, remaining lines are test inputs.
Open toolHex / Text Converter
Convert between hexadecimal and plain text.
Open toolEntropy Analyzer
Measure Shannon entropy to judge randomness of a string.
Open toolCVSS Vector Explainer
Translate a CVSS v3 vector string into plain English.
Open toolNetwork / DNS
DNS Record Viewer
Reference view of common DNS record types for a domain.
Open toolDomain Information
Structured overview of registration and hosting concepts.
Open toolIP Information
Explain address class, scope and routing context.
Open toolCIDR / Subnet Calculator
Compute network range, mask, and usable host count.
Open toolPort Reference
Look up common ports, their services and exposure risk.
Open toolUtilities
UUID Generator
Generate RFC 4122 version 4 identifiers.
Open toolTimestamp Converter
Convert Unix timestamps to human-readable UTC.
Open toolURL Encoder / Decoder
Percent-encode or decode URL components.
Open toolRandom String Generator
Generate high-entropy strings for tokens and test data.
Open toolUser-Agent Parser
Break a User-Agent string into platform, engine and client.
Open toolPassphrase Generator
Generate memorable high-entropy word-based passphrases.
Open tool