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.

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.

NumberFrom base

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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