Simulate single qubit quantum states, Bloch sphere 3D projections, Pauli X/Y/Z, Hadamard, Phase, and arbitrary rotation quantum gates with real-time measurement probabilities.

Simulate the Bennett-Brassard BB84 Quantum Key Distribution protocol. Model Alice basis encoding, Eve intercept-resend eavesdropping, Bob basis detection, QBER, and secret key rate.

Decode QR codes online from images or via camera. Free, fast, and secure.

Convert pixels to rem and rem to pixels instantly. Set your base font size, see a full conversion table, and get CSS-ready values. Free online PX to REM converter.

Searchable list of well-known TCP/UDP ports. Find port numbers, protocols, and service descriptions.

Check password strength in real-time.

Calculate mathematical password entropy in Shannon bits, character set search space, and offline brute-force crack time against modern GPU clusters.

Generate password hashes (MD5, SHA1, SHA256).

Calculate optical link loss budget, receiver dynamic range, splice/connector insertion losses, and link safety margins according to ITU-T G.957 and IEEE 802.3 standards.

Calculate chromatic dispersion, pulse broadening, dispersion-limited distance, and power penalty for single-mode optical fibers (ITU-T G.652, G.655) across O-band and C-band wavelengths.