Small tools. Useful answers.
Inspect Bitcoin data, check the details, and understand what your wallet is doing. No private keys, no signing, and no external Bitcoin data APIs.
Receipts
Download a printable Bitcoin transaction receipt with exact amounts and a QR verification link.
OP_RETURN message decoder
Decode Bitcoin OP_RETURN script hex into data pushes and readable UTF-8 text, directly in your browser.
Transaction weight calculator
Convert Bitcoin transaction weight units (WU) to virtual size (vbytes), with exact rounding.
Block subsidy & halving calculator
Calculate the Bitcoin mainnet block subsidy at any height, its halving epoch and the next halving height.
BTC ↔ sats converter
Convert bitcoin and satoshis with exact integer arithmetic.
Transaction fee calculator
Estimate a total fee from virtual size and sats per vbyte.
Address inspector
Check a Bitcoin address and inspect its output script.
Transaction decoder
Inspect inputs, outputs and virtual size from raw hex.