Free, private calculators, converters, and developer utilities in your browser. Instant results with no logins and zero data tracking.
Online by link. Offline by design. Instant, ultra-low latency utilities running entirely inside your local browser sandbox.
Welcome to the MayOnlineTools (MoT) workspace. Online by link, offline by design. Designed for engineers, creators, students, and professionals who require high-velocity utilities with absolute privacy guarantees. All tools run 100% locally on your device via client-side JavaScript, Web Workers, WebAssembly, and WebGPU.
Unlike traditional web utilities that transmit text, API keys, or financial figures to cloud servers for remote processing, MayOnlineTools uses a decentralized client-side model:
In-depth sysadmin cheat sheets, operating system optimizations, and cybersecurity hardening guides from our curated master library.
A comprehensive engineering runbook for technical SEO directors, web architects, and DevOps teams. Master XML sitemap index partitioning, crawl budget optimization, canonical protocol hygiene, bot-specific indexing with X-Robots-Tag HTTP headers, and AI scraper governance.
A comprehensive engineering runbook for network architects, DevOps engineers, and cloud infrastructure teams. Learn how to architect modern DNS with DNS-over-HTTPS (RFC 8484), deploy dual-stack IPv6 addressing, construct reverse ip6.arpa PTR zones, and secure domain resolution with DNSSEC and Anycast BGP routing.
A comprehensive technical runbook for web architects and security engineers. Learn how to architect airtight Content Security Policy (CSP Level 3) headers, mitigate Cross-Site Scripting (XSS) via nonces and strict-dynamic, prevent clickjacking, and isolate browser hardware capabilities with Permissions-Policy.
A complete production engineering runbook for asymmetric public-key cryptography: RSA vs Elliptic Curve (ECDSA P-256/P-384), PKCS#8 vs PKCS#1 DER containers, Web Crypto API keygen, and OpenSSL CLI management.
An end-to-end technical guide to tabular data ingestion, covering RFC 4180 CSV compliance, TSV database exports, GitHub Flavored Markdown table generation, and batch Unix timestamp resolution for distributed logging and observability pipelines.
A deep engineering runbook on modern serialization formats: contrasting TOML tables, YAML hierarchies, RFC 8259 JSON, and streaming NDJSON (JSON Lines) for scalable cloud pipelines, LLM fine-tuning, and container configuration.
