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Bitcoin & Monero address checker

Paste an address to check it is valid, which network and type it is, and whether its checksum matches. Compare two addresses character by character to catch clipboard-hijacking malware and “address poisoning” look-alikes.

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Works offline. Everything runs in your browser; this page makes no network requests when you check an address.

Check an address

Compare two addresses

Paste the address you meant to use, and the one now in your wallet's “send to” box.

What it checks

  • Bitcoin — legacy (1…), nested SegWit (3…), native SegWit (bc1q…) and Taproot (bc1p…), including testnet. Checksums: Base58Check, bech32 and bech32m.
  • Monero — standard (4…), subaddresses (8…) and integrated addresses, on mainnet, stagenet and testnet, with the Keccak checksum.
  • Litecoin (L…, M…, ltc1…) and Ethereum-style 0x addresses (EIP-55 checksum when mixed case).
  • Payment links — bitcoin: and monero: URIs, showing the amount and label they request.

Address poisoning, briefly

Scammers send you a tiny transaction from an address that starts and ends like one you use, hoping you'll copy it from your history later. Clipboard malware swaps the address as you paste. A valid checksum doesn't protect you from either — only comparing the whole address does.