Generate SHA-1 hash from any string online securely in your browser using SubtleCrypto.

Calculate serverless compute costs across AWS Lambda, Cloudflare Workers, and Google Cloud Functions. Model GB-seconds, memory allocation, invocation tiers, and free allowances.

Check the online status, response time, and HTTP status code of any server or website URL. Free server status checker.

Test your website responsive design across different screen resolutions and devices online.

Generate structured JSON-LD schema for Article, Product, LocalBusiness, and more.

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.

Calculate optimal responsive image dimensions, width descriptors (w), DPR multipliers, and generate production HTML5 picture and img srcset code with WebP/AVIF file size savings.

Test and debug regular expressions in real time. See matches highlighted, capture groups, and match details. Supports JavaScript regex flags. Free online regex tester.

Generate and test regular expressions online. Includes common regex patterns for email, URL, phone, IP, and more.

Generate random numbers with custom ranges, quantities, and options. Supports unique numbers, sorting, and bulk generation. Uses crypto-secure randomness. Free.