Number Bases
Number Bases, a small reckoner that computes in your browser and stores nothing. No account, no cloud, no telemetry.
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.
Binary for the machines, hexadecimal for the colour codes, decimal for the humans — and you, stuck translating between them. Number Bases converts a number from one base to another and shows you the result, whether you are debugging, studying, or simply curious what your birthday looks like in binary. It computes and keeps nothing; the bases have no memory here.
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
Number Bases 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. Number Bases 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
How do I convert a decimal number to binary or hex?
Type the number, choose the bases, read the answer. The conversion happens instantly in the page — there is a live demo right here if you want to see for yourself.
Does this base converter work without internet?
Completely. It is a single HTML file that runs offline in your browser, computes on the spot, and stores nothing — nothing you type ever leaves the page. Handy in an exam-revision cabin with no signal.
Who actually needs to convert number bases?
Programmers reading hex dumps, students meeting binary for the first time, electronics tinkerers, and puzzle-setters. Also anyone who has stared at a colour code and wondered what the numbers meant.
Go deeper on Number Bases
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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.