Free Online Calculators, Converters & Web Utilities
Zero-friction digital tools for financial planning, file conversions, developer workflows, and daily online productivity - built for maximum speed and data privacy.
Explore Utilities
Showing 18 of 452llms.txt & llms-full.txt Generator for AI Search
Generate standard-compliant /llms.txt and /llms-full.txt files to optimize your website for LLM crawlers, AI search agents, and GEO. 100% browser-based with multi-language and Greek support.
Instagram Unfollowers & Data Export Delta Tracker
Detect who unfollowed you on Instagram using your official data export ZIP. Features snapshot baseline comparison to isolate new unfollows without passwords or external servers.
Lottery Number Picker & Multi-Ball Draw Simulator
Cryptographically secure lottery quick pick generator and multi-ball draw simulator for US Powerball, Mega Millions, EuroMillions, and custom games.
Dog Age to Human Years Biological Converter
Calculate biological canine age into human equivalents using Epigenetic DNA methylation and AVMA breed size metrics.
Spin the Wheel & Choice Picker
Interactive HTML5 wheel spinner for fair random decisions, giveaway drawings, and weighted choices.
Coin Flipper & Probability Simulator
3D interactive coin flipper and high-speed Monte Carlo probability batch simulator backed by Web Crypto API entropy.
Compound Investment & Return Calculator
Calculate long-term compound growth, monthly contributions, and investment returns.
Web Core Vitals INP, LCP & CLS Metric Budget Estimator
Calculate and allocate front-end engineering budgets for Google Core Web Vitals (INP, LCP, CLS) across mobile and desktop devices.
TLS/SSL Cipher Suite Security Strength & Perfect Forward Secrecy Auditor
Audit TLS/SSL cipher suites for Perfect Forward Secrecy (PFS), protocol vulnerabilities, NIST SP 800-52r2, and PCI DSS 4.0 compliance.
CAA DNS Record Synthesizer
Synthesize RFC 8659-compliant Certificate Authority Authorization (CAA) DNS records with wildcard security controls and iodef alerts.
Permissions-Policy Header Builder
Construct enterprise-grade Permissions-Policy (Feature-Policy) HTTP security headers to lock down camera, microphone, geolocation, and privacy APIs.
Expect-CT & Certificate Transparency Policy Header Validator
Audit Signed Certificate Timestamps (SCTs), evaluate RFC 9162 Merkle log compliance, and verify deprecated Expect-CT headers.
CORS Access-Control Header Validator
Inspect, debug, and simulate browser preflight OPTIONS requests and Access-Control-* CORS headers. Detect credential mismatches and generate production server configs.
Markdown TOC & Anchor Slug Generator
Parse Markdown headers and instantly generate nested Table of Contents with GitHub, GitLab, and Bitbucket compatible anchor links and collision resolution.
SQL to TypeScript Interface Generator
Convert SQL DDL CREATE TABLE statements into strict, production-ready TypeScript interfaces and types with custom naming and nullability controls.
WebSocket Frame Masking Key & Opcode Hex Inspector
Inspect and parse RFC 6455 WebSocket frames, disassemble raw hexadecimal streams, reverse 4-byte XOR client masking keys, and synthesize custom binary packets.
Semantic Release & Git Conventional Commit Builder
Construct, validate, and format standardized Conventional Commits (v1.0.0) with automated SemVer release impact calculation and instant Git CLI terminal commands.
CSS Logical Properties Converter
Transpile bidirectional CSS logical properties (inline, block, start, end) into physical directional rules for LTR and RTL compatibility.
Ultra-Fast Architecture & Modern Web Processing
TwisterTools is built using Next.js 15, TypeScript, and modern browser APIs. Our utilities are engineered for zero-latency user interaction, offering instantaneous execution for financial forecasting, data conversions, document transformations, and developer tools without annoying signup paywalls or intrusive software installations.
Built-In Privacy & Data Security Standards
100% of our utilities execute locally inside your browser memory using WebAssembly and modern browser APIs. Zero files, passwords, or documents are ever uploaded to an external server or database.
Frequently Asked Questions
Is TwisterTools free for personal and commercial use?
Yes. Every tool, generator, converter, and calculator on TwisterTools is completely free to use without subscription fees or registration limits.
How are files and user data handled?
100% of our utilities execute locally inside your browser memory using WebAssembly and modern browser APIs. Zero files, passwords, or documents are ever uploaded to an external server or database.
Can I use TwisterTools utilities offline?
Yes! Once loaded, client-side tools continue to work smoothly even if you disconnect from the internet.