Interactive demo · try it yourself
One key, four address formats
You've probably seen Bitcoin addresses that start with 1, 3, bc1q, or bc1p and wondered whether they're different kinds of money. They're not. They're four ways to write down an address for the same wallet. Generate a throwaway seed and watch all four come out of it.
The seed below is randomly generated in your browser and thrown away when you leave. Never type your own seed words into any website — including this one. There's no input box, on purpose.
Make one throwaway seed and see the four address formats it produces.
Runs entirely in your browser · nothing is sent, saved, or logged.
Same seed, same coins — just four ways your wallet can format a receive address. A modern wallet defaults to native segwit (bc1q) or taproot (bc1p): lower fees, better privacy. The older 1 and 3 formats still work forever — any wallet can send to any of them.
If a wallet shows you a bc1 address and an exchange shows you a 3… address, nothing is wrong — both are Bitcoin, both are yours if they came from your keys. The format only changes the fee and some privacy details, never whether it's real Bitcoin. (This is different from sending to the wrong network, which is a real mistake.)
✓ Last verified: July 29, 2026