# FourLabs

> A fast, free collection of web tools for everyday calculations and conversions. No ads, no clutter — just the answer.

## Pages

- [Home](/): Browse calculators, converters, and text tools.
- [All Tools](/tools): Complete listing of every tool by category.
- [BMI Calculator](/tools/bmi-calculator): Calculate your Body Mass Index instantly.
- [Percentage Calculator](/tools/percentage-calculator): Compute percentages, increases, and decreases.
- [Age Calculator](/tools/age-calculator): Find your exact age in years, months, and days.
- [Calorie Calculator](/tools/calorie-calculator): Estimate daily calorie needs (BMR, TDEE) and macro targets.
- [Case Converter](/tools/case-converter): Convert text to UPPER, lower, Title, camelCase, snake_case, kebab-case & URL slugs.
- [Line Break Remover](/tools/line-break-remover): Remove line breaks & join broken paragraphs from PDFs and emails.
- [List Sorter & Alphabetizer](/tools/list-sorter): Sort any list A–Z, Z–A, by length, numerically, reverse or randomize — with dedupe.
- [Duplicate Line Remover](/tools/duplicate-line-remover): Remove duplicate lines from emails, IDs, keywords — find, count & extract unique entries.
- [Find and Replace Text](/tools/find-and-replace): Bulk find and replace words, phrases or regex patterns across long text — in your browser.
- [Invisible Text Generator](/tools/invisible-text-generator): Copy invisible Unicode characters for blank WhatsApp messages, empty Instagram bios & blank Free Fire names.
- [Weight Converter](/tools/weight-converter): Convert kg, lb, oz, g, mg, stones, metric tons & US/UK tons — instant multi-unit grid.
- [Temperature Converter](/tools/temperature-converter): Convert Celsius, Fahrenheit, Kelvin, Rankine & Réaumur with formulas & reference points.
- [Blog](/blog): Guides and explainers about everyday calculations and conversions.