About FourLabs
Simple, accurate online tools — built for speed.
Who we are
FourLabs is an independent web project dedicated to building free, reliable online calculators, unit converters and text utilities. We started FourLabs because the web is full of slow, ad-heavy tool sites that bury the answer behind pop-ups and tracking scripts. We wanted something cleaner — pages that load instantly, give you the result, and get out of your way.
What we offer
FourLabs is organized into four focused labs, each grouping related tools so you can find the right one in seconds:
- Text Lab — everyday text utilities for writers, students and developers: case converter, number-to-words, find & replace, duplicate line remover, line break remover, list sorter and invisible text generator.
- Daily Tech Lab — practical calculators for everyday numbers: BMI, calorie, percentage and age calculators — each with the formula shown so you can verify the math.
- Conversion Lab — fast, multi-unit converters: temperature converter and weight converter, with more units on the way.
- Dev & Design Lab — coming soon. A growing set of tools for developers and designers, from color and code helpers to formatting utilities.
You can browse the full library and access all our smart utilities directly from the main dashboard.
How we’re different
- Instant results. Tools run entirely in your browser — no waiting on a server round-trip.
- No clutter. Minimal UI, no auto-playing video, no nagging pop-ups.
- Privacy-first. Your inputs stay on your device. We don’t store the numbers you type.
- Accurate and documented. Each tool ships with the formula it uses so you can verify the math.
Our mission
To be the fastest, cleanest place on the web to do a quick calculation, convert a unit, or clean up a piece of text — on any device, with zero friction.
Contact Us
We read every message. Bug reports, feature ideas and feedback are all welcome. The fastest way to reach us is by email: ebox81@gmail.com.
When you write in, it helps to include:
- Bug reports — the tool name, your browser/device, and steps to reproduce.
- Feature requests — describe the calculation or conversion you need and an example.
- Content corrections — link to the page and quote the section to update.