About the Number Base Converter
Paste an integer and choose the source and target bases. The converter uses BigInt, so large values beyond JavaScript's safe integer range are handled exactly.
How to use it
- 1Enter the numberUse digits valid for the source base.
- 2Set the basesFrom 2 to 36.
- 3Copy the resultThe output uses 0–9 and a–z.
Why use this number base converter?
- Nothing leaves your device. The work happens in your browser tab. There is no upload endpoint in this app, so your files and text cannot be stored, logged or seen by us.
- No upload wait. You skip the round trip to a server entirely. Results are limited by your own CPU, not by network speed or queue size.
- Free, no account, no quotas. No sign-up wall, no watermark, no daily limit. Optional accounts only exist to save favourites and presets across devices.
Frequently asked questions
Is my conversion safe to use here?
Yes. This tool runs entirely in your browser using JavaScript. Nothing you paste or open is sent to a server, and the page keeps no copy after you close it.
Do I need to create an account?
No. Every tool is fully usable without signing in. An account only adds saved favourites and reusable presets.
Does it work on a phone?
Yes. The interface is mobile-first with large touch targets and a stacked layout, so it works on phones and tablets as well as desktops.
Does it support fractional numbers?
No. Integer conversion only. Fractional bases need a different representation and rounding rules.
Why is base 36 useful?
It packs large integers into short alphanumeric strings, often used for short URLs and compact identifiers.