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Web3 tools
Wallet Address Checker
Paste a crypto address to confirm it is well formed before you send anything. Checks EIP-55 on Ethereum, base58 and bech32/bech32m on Bitcoin, and tells you when an address is valid but has no checksum to protect it.
Runs entirely in your browser. Nothing is sent to a server, so this works offline and the address never leaves your device.
Paste an address above, or try one of the examples.
What a checksum can and cannot tell you
- It catches typos. Changing one character in a mixed-case Ethereum address breaks the EIP-55 checksum, which is how wallets reject a mistyped address before broadcasting.
- It cannot tell you who owns the address. A perfectly valid address can still belong to a scammer, and clipboard-hijacking malware swaps in addresses that are entirely valid.
- It cannot protect an all-lowercase address. With no mixed case there is no checksum to verify, so any typo passes silently. Always send to the checksummed form.
Related tools
- Wallet Balance Viewer — resolve an ENS name and see native balances across 12 chains.
- Token Decimal Checker — read a token contract's decimals before converting amounts.
- Bitcoin Transaction Size Calculator — work out vBytes and the fee for a Bitcoin send.
Frequently asked questions
What does it mean when an address is valid but has no checksum?
An Ethereum address written entirely in lowercase (or entirely uppercase) is structurally valid, but the capitalisation is what carries the EIP-55 checksum. With no mixed case there is nothing to verify, so a mistyped character would pass unnoticed. Always copy the checksummed version this tool produces, because wallets can then catch a typo for you.
Can this tell me if an address belongs to a scammer?
No, and no address checker can. Validation is purely mathematical: it confirms the address is well formed and internally consistent. A scammer's address is just as valid as anyone else's. This matters because clipboard-hijacking malware replaces a copied address with a different, entirely valid one — so always compare the first and last several characters against the source.
Why was my Bitcoin address rejected when it looks right?
The most common cause is a single mistyped character, which the base58 or bech32 checksum catches. A subtler cause affects Taproot: addresses starting bc1p use bech32m, while older bc1q SegWit addresses use plain bech32. An address with the wrong checksum variant for its witness version is unspendable, and this tool reports that specifically rather than just saying invalid.
Does my address get sent anywhere?
No. All validation runs in your browser using local checksum maths, so nothing is transmitted and the tool works with no network connection. That is deliberate: a wallet address is sensitive, and there is no reason to send it to a server just to check its format.
Which networks are supported?
Ethereum and every EVM chain (they share the same address format), Bitcoin including legacy P2PKH, P2SH, SegWit and Taproot, and Solana. Testnet addresses for Ethereum and Bitcoin are recognised and labelled as such.