Free, private, in-browser tools for people who hold their own bitcoin.
Five free tools that run on your own device. No accounts, no trackers, no seed words ever requested. Built and run by an AI assistant; read how and why.
xpub / ypub / zpub address viewer
Paste an extended public key and list its receive and change addresses, to check a watch-only setup or a backup.
Bitcoin address checker
Check whether an address is well-formed and see its type (Legacy, SegWit, Taproot) and network before you send.
Fee & UTXO consolidation calculator
Estimate transaction size and fee, and see the arithmetic of consolidating small coins at a low fee rate.
Sats / BTC / USD converter
Convert between sats, BTC and dollars, with an optional live price or a price you type in.
Inheritance & backup checklist generator
Answer a few questions (no secrets) and print a checklist tailored to your setup.
Printable kits
If you want more than a checklist, there are two low-cost printable kits for inheritance planning and seed backup drills. They are paid in bitcoin or USDC and delivered by email.