Text Processing

Convert text to Unicode small capitals (ʜᴇʟʟᴏ). Uses Phonetic Extensions small-cap glyphs; letters without a dedicated glyph fall back to lowercase.

Text Processing

Add a strikethrough line through every character via the Unicode combining mark U+0336. Plain text — no markdown needed.

Text Processing

Convert text to real Unicode superscript (ˣ²) or subscript (H₂O), or mixed — no HTML tags. Digit coverage is full; letter coverage follows Unicode.

Security

Generate cryptographically secure random key material driven by entropy budget — request N bits of entropy, get hex/base64/base64url output. Also supports custom-alphabet strings via crypto.randomInt (rejection-sampled, no modulo bias). Use this instead of Math.random()-based tools for any secret/key/token.

Security

Audit HTTP response headers for security compliance — parses the raw headers you paste (no network) and grades them against the OWASP secure-header set with value-level checks: HSTS max-age, CSP unsafe-inline/eval, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, COOP/COEP/CORP and more. Outputs a letter grade (A+ to F) plus per-header findings with copy-ready fix recommendations.

Security

Split a secret into n shares where any k (the threshold) are required to reconstruct it — Shamir's k-of-n scheme over GF(256). Pure in-process cryptography (crypto.randomBytes for polynomial coefficients), no network. Split a password/key/passphrase into shares held by separate people, then combine any k of them to recover it. Confidentiality only — no authenticity.

Media

Generate a stereo test tone file with independent left and right channel frequency, phase, waveform, and level controls.

Security

Encrypt text with an RSA public key or decrypt ciphertext with the matching private key, using OAEP padding (SHA-1 or SHA-256). Handles long messages by chunking. Keys and data stay local. PKCS#1 v1.5 is intentionally not offered (Node disables it for decryption due to Bleichenbacher attacks).

Security

Generate an RSA key pair (2048/3072/4096-bit) as PEM-encoded public and private keys. Optionally encrypt the private key with a passphrase. PKCS#8 (recommended) or PKCS#1 private key format. Everything runs locally.

Security

Generate an SSH key pair (Ed25519 recommended, RSA 4096, or ECDSA P-256) with an OpenSSH-format public key ready for ~/.ssh/authorized_keys, a SHA256 fingerprint, and a PEM private key. Optional passphrase encryption. Runs locally.

Validation

Validate 7-character UK/Irish SEDOL securities identifiers with weighted mod-10 check-digit verification and SEDOL-7 structure breakdown.

Text Processing

Fetch an RSS or Atom feed by URL (or paste raw XML), parse it, sort items by publish date, deduplicate, apply a time window, and output a clean Markdown summary