Free Online Tools: Always Here.
50+ free online calculators and utilities for finance, health, developers, and SEO — EMI, SIP and FIRE planners, BMI and calorie tools, JSON, JWT and regex utilities, and more. Every tool runs in your browser. No sign-up, no uploads, no clutter. This section predates AI Ledger's pivot to a verified-facts tracker and stays live as a free utility archive.
Free online tools that respect your privacy
This tools archive is a free, no-sign-up collection of calculators and utilities built around one principle: your data should never leave your device. Every tool here runs entirely in your browser using client-side JavaScript — nothing you type into an EMI calculator, a JWT decoder, or a resume rewriter is uploaded, logged, or stored on a server.
Finance calculators
Plan loans, investments and goals with our EMI calculator, SIP calculator, compound interest calculator, FD calculator, FIRE calculator and debt payoff planner.
Health & fitness tools
Track your body metrics with the BMI calculator, calorie / TDEE calculator, macro calculator, ideal weight calculator and water intake calculator.
Developer utilities
Everyday engineering helpers: JSON formatter, JWT decoder, Base64 encoder/decoder, regex tester, UUID generator, subnet calculator and cron parser.
SEO & text tools
Optimise content with the meta tag analyzer, schema generator, Open Graph generator and keyword density checker, plus text utilities like the word counter, case converter and slug generator. Pair any tool with our in-depth guides to go from quick answer to real understanding.