Convert number bases
Enter a whole number and its base to convert it to binary, octal, decimal and hexadecimal at once. Big integers stay exact. The report is stored privately in your account.
No sign-up needed — runs instantly in your browser.
How it works
- 1Enter your number
- 2Choose its current base, then press Run
- 3Download the conversions or find them in your files
Frequently asked questions
- How big can the number be?
- Arbitrarily large — conversions use BigInt, so there's no precision loss.
- What if I enter an invalid digit?
- You'll get a clear error naming the base, e.g. an 8 isn't valid binary.
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