Unit Converter
An offline unit converter that runs in your browser: pull the cable out of the wall and it works exactly the same.
This is not a screenshot. It's the real tool, running right here: go on, put something in it.
Forged into a knife, this tool ages with use: the blades you reach for wear soft, entries you tend keep their bloom, and the years travel with the file through every reforge.
The recipe is in cups, the plank is in inches, and the weather report from your cousin is in Fahrenheit. The Unit Converter turns one unit into another and hands you the number, no history kept, no questions asked. It is the kitchen-drawer calculator for a world that never quite agreed on measurements.
Standing facts
- One HTML file. Opens in any modern browser, on any operating system.
- No account. No login, no sign-up, no e-mail wall.
- No cloud. Nothing leaves your browser: no server, no telemetry, no analytics.
- Yours forever. The file keeps working whether or not Offline.Ltd does.
- Ages with use. Entries you tend keep their bloom; the years travel with the file through every reforge.
In ten years
Unit Converter computes; it doesn't hoard. Open the file in 2036 and it will do the same arithmetic it does today, because the arithmetic is written into the file and nothing about it needs a server to agree.
If Offline.Ltd closes tomorrow, nothing on your machine notices. That isn't a marketing promise; it's simply what a file is.
Getting your data out
There is nothing locked in to get out: copy the numbers, or keep the file. Either way you owe no one a request form. No export queue, no "we'll e-mail you a link within 48 hours", no format that only one vendor can read.
Copy the file to a USB stick, a NAS, a folder your devices already sync. It runs on Windows, macOS, Linux, Android and iOS, online or off, because a browser is the only thing it ever needed.
Who else sees this
Nobody. Unit Converter works out its answer in your browser and forgets it the moment you close the tab: there is no store to breach, because nothing is stored. There is no account, no telemetry, no analytics, and no code in the file that opens a network connection, pull the cable and watch it carry on working. How privacy works across the Reckoners tools →
Questions people ask
Does this unit converter work offline?
Yes — it is a single HTML file that runs entirely in your browser, no connection needed. It computes your conversion on the spot and stores nothing; nothing you type ever leaves the page.
How do I convert between units with it?
You give it a value and the units on each end, and it gives you the answer. There is a live demo right on the page — go on, try it, it is the real thing.
Who needs an offline unit converter?
Cooks with foreign recipes, travellers with foreign speedometers, woodworkers with old plans, and anyone whose phone signal disappears exactly when the measurements matter.
Go deeper on Unit Converter
More Reckoners
Fits your knife at weight 1. Nothing here is final, Knife follows Life. Reforging within your tier is free, forever. Add it, drop it, reforge it later; the file stays yours either way.