PX to REM Converter
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.
QR Code Decoder
Decode QR codes online from images or via camera. Free, fast, and secure. Fast, free, and secure client-side execution in your browser.
Quantum Key Distribution (BB84 Protocol) Simulator
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.
Qubit Bloch Sphere & Quantum Gate Calculator
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.
Random Number Generator
Generate random numbers with custom ranges, quantities, and options. Supports unique numbers, sorting, and bulk generation. Uses crypto-secure randomness. Free.
Regex Pattern Generator & Tester
Generate and test regular expressions online. Includes common regex patterns for email, URL, phone, IP, and more. 100% free and private browser utility.
Regex Tester
Test and debug regular expressions in real time. See matches highlighted, capture groups, and match details. Supports JavaScript regex flags. Free online regex tester.
Responsive Image srcset & sizes Markup Generator
Calculate optimal responsive image dimensions, width descriptors (w), DPR multipliers, and generate production HTML5 picture and img srcset code.
Satellite & RF Link Budget Calculator
Calculate satellite and wireless RF link budget, free-space path loss (FSPL), EIRP, receiver G/T, carrier-to-noise ratio (C/N0, Eb/N0), fade margin, and Shannon capacity.
Schema Generator
Generate structured JSON-LD schema for Article, Product, LocalBusiness, and more. Fast, 100% private in-browser utility with zero server uploads.
Screen Resolution Simulator
Test your website responsive design across different screen resolutions and devices online. Fast, free, and secure client-side execution in your browser.
Server Status Checker
Check the online status, response time, and HTTP status code of any server or website URL. Free server status checker. 100% free and private browser utility.
Serverless Cost Calculator
Calculate serverless compute costs across AWS Lambda, Cloudflare Workers, and Google Cloud Functions. Model GB-seconds, memory allocation, invocation tiers, and free allowances.
SHA-1 Hash Generator
Generate SHA-1 hash from any string online securely in your browser using SubtleCrypto. Fast, free, and secure client-side execution in your browser.
SHA-512 Hash Generator
Generate SHA-512 hash from any string online securely in your browser. Fast, free, and secure client-side execution in your browser.
Shannon Channel Capacity & Spectral Efficiency Calculator
Calculate Shannon channel capacity, spectral efficiency (bits/s/Hz), SNR in decibels, Eb/N0, and compare QPSK, 16-QAM, 64-QAM modulation limits against the Shannon bound.
Sitemap URL Extractor
Extract all URLs from an XML sitemap. Fast, free, online sitemap parser. Fast, free, and secure client-side execution in your browser.
Source Code Viewer
View HTML source code with syntax highlighting and generate view-source links. Fast, free, and secure client-side execution in your browser.
SQL Beautifier
Format and beautify SQL queries with proper indentation, keyword uppercasing, and alignment. Free online SQL formatter and beautifier tool.
SSL Checker
Check the SSL certificate details of any website. View issuer, expiry date, protocol version, and key size. Free, private, and simple to use in your browser.
SSL Converter
Convert SSL certificates between PEM, DER, PKCS7, and PFX formats. Client-side simulated converter. Fast, interactive, and completely free with instant results.
SSL Decoder
Decode a PEM SSL certificate to view its details, subject, issuer, and validity fields. Fast, free, and secure client-side execution in your browser.
SSL Key Matcher
Check if an SSL certificate and private key match. Simulated client-side check. Fast, free, and secure client-side execution in your browser.
Svg Editor
Free, fast, and secure svg editor tool for your everyday needs.
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