---
title: "Free Online Calculators and Browser Tools | AumnI tools"
description: "Free tools that run in your browser: mortgage and loan calculators, BMI and calorie tools, JSON and code formatters, unit converters, timers and games."
url: https://aumnitools.com/
updated: 2026-11-08
---

# AumnI tools

AumnI tools is a free collection of calculators, converters, generators, trackers and small games, grouped into eight categories from finance and health to developer tools. There is no account to create: open a tool and use it.

Most tools do all their work in your browser, so what you type stays on your device. The few that contact another site say so on their page, along with what they send: the QR Code Designer, for example, puts the text you encode in an image request to a QR service. Every tool page explains the method the code uses, works through an example with real numbers and lists what the tool does not do, including tools whose results are simulated.

## Categories

- [Lifestyle tools](https://aumnitools.com/category/lifestyle.md) (39): Plan trips, meals and chores, scale recipes, convert cooking units, work out paint, fuel and shipping costs, split bills and track dates and goals.
- [Tech tools](https://aumnitools.com/category/tech.md) (34): Format JSON, XML, SQL and code, test regex, convert CSV, encode URLs and Base64, build robots.txt, .htaccess and meta tags, and check contrast online.
- [Education tools](https://aumnitools.com/category/education.md) (33): Study with a scientific and graphing calculator, flashcards, Pomodoro timer, periodic table, citations, typing tests and quizzes.
- [Health tools](https://aumnitools.com/category/health.md) (26): Calculate BMI, body fat, calories, macros, heart rate zones and 1RM, plan meals, time workouts and fasts, and track mood, habits and blood pressure.
- [Financial tools](https://aumnitools.com/category/financial.md) (24): Work out mortgage, auto and personal loan payments, compound interest, retirement and 401k growth, budgets, tax, margins and break-even points online.
- [Productivity tools](https://aumnitools.com/category/productivity.md) (20): Count words, change text case, resize images, make passwords, UUIDs and invoices, and draw QR-style placeholders with tools that run in your browser.
- [Creative tools](https://aumnitools.com/category/creative.md) (13): Edit photos, make white backgrounds transparent, pick colours, build gradients and patterns, design logos and QR codes, draw and make pixel art in your browser.
- [Entertainment tools](https://aumnitools.com/category/entertainment.md) (11): Play Tic Tac Toe, Rock Paper Scissors, memory and number guessing games, roll dice, flip a coin, pick with a decision wheel and make memes in your browser.

## For assistants and agents

- [llms.txt](https://aumnitools.com/llms.txt): a map of every page with its Markdown version
- [llms-full.txt](https://aumnitools.com/llms-full.txt): the full text of every tool and category page in one file
- [tools.json](https://aumnitools.com/tools.json): a machine-readable index of every tool