Generate JSON Web Keys (JWK) for RSA, EC (P-256/P-384/P-521/secp256k1), and OKP (Ed25519/Ed448/X25519/X448), or parse an existing JWK to inspect its parameters, thumbprint, and metadata

Security

JWT Inspector & Verifier

Decode a JWT (header + payload) with syntax highlighting, diagnose standard claims, and verify the signature with HS*/RS*/PS*/ES*/EdDSA keys — plus a tampered-token forgery demo

Validation

Robots.txt Lint Validator

Lint robots.txt syntax, flag risky rules, and test important URLs before you ship crawler directives

Validation

Heading Hierarchy Auditor

Audit heading structure from a live URL or pasted HTML, then flag skipped levels, multiple h1 usage, style-only heading abuse, and title metadata drift

Validation

Screen Reader Simulation Tester

Simulate the reading order and spoken semantics a screen reader may expose from a URL or raw HTML, then flag likely accessibility gaps

Security

JWT Decoder & Security Auditor

Decode JWT header and payload, verify HS256 or RS256 signatures, and flag algorithm, expiry, and sensitive-claim security risks

Validation

IBAN Validator

Validate International Bank Account Numbers (IBAN)

Security

SQL Injection Detector

Detect common SQL injection attack patterns in input strings

Security

XSS Payload Detector

Detect XSS (Cross-Site Scripting) attack vectors in input strings

Validation

Global Phone Validator

Validate phone numbers from multiple countries including China, US, and more with detailed formatting and carrier info