Sending funds or integrating an address into a contract with a typo can mean lost funds or failed calls. The Address Validator checks Ethereum and EVM addresses for 0x prefix, length, hex characters, and EIP-55 checksum—so you can catch typos and invalid checksums before sending or integrating.
How does the address validator work?
The validator checks for the 0x prefix, correct length (42 characters), valid hexadecimal characters, and EIP-55 checksum compliance for Ethereum and EVM addresses. You paste or type an address; the tool reports valid or lists which checks failed. All validation is performed client-side in your browser; no data is sent to any server. Use it before sending funds or integrating an address in a contract to catch typos and invalid checksums. Checksummed addresses are recommended for safety, but both checksummed and non-checksummed addresses work on-chain. If a valid-looking address fails, check length (42 chars with 0x), hex characters only, and EIP-55 checksum—mixed-case addresses must match the checksum pattern.
Key Features
- Checks — 0x prefix, 42 characters, hex only, EIP-55 checksum.
- Invalid address — The tool displays an error and highlights which validation checks failed.
- Privacy — All validation is performed client-side in your browser. No data is sent to any server.
- Checksum vs non-checksum — Checksummed is recommended; both work on-chain.
- When to use — Before sending funds or integrating an address in a contract.
- Troubleshooting — Check length (42 chars with 0x), hex only, and EIP-55. Mixed-case must match checksum pattern.
How to Use the Address Validator
- Open the Address Validator tool.
- Paste or type the Ethereum or EVM address. View result: valid or list of failed checks.
- Copy normalized lowercase or checksummed output if needed. Use the "Use tool" button on the docs page if you are reading this from the documentation.
Real Use Cases
- Before sending funds — Validate address. Catch typos and invalid checksums. Use with Checksum Address Generator to get checksummed form.
- Contract integration — Validate addresses from config or user input. Use with Keccak256 Hasher and ABI Encoder & Decoder when building calldata.
- Support — User says “invalid address”? Run through validator and report which check failed. Use with Checksum Address Generator.
- Documentation — Show team or users what makes an address valid. Use tool output as reference.
- Wallets and dApps — Validate before display or before submitting transactions. Use with Checksum Address Generator.
- Multi-chain — Same rules for any EVM address (Ethereum, Polygon, etc.). One validator for all.
Why Use the Address Validator Instead of Alternatives?
- vs. Checksum Address Generator — Checksum Address Generator produces checksummed form. This tool validates and explains failures. Use both: generate then validate.
- vs. Keccak256 Hasher — Keccak256 Hasher hashes data. This tool validates address format and checksum. Use hasher for custom hashing.
- vs. ABI Encoder & Decoder — ABI Encoder & Decoder encodes/decodes calldata. This tool validates addresses. Use both when building or decoding contract calls.
- vs. Manual regex — No need to remember length and checksum rules. Paste, get clear pass/fail and which check failed.
Benefits for Developers and Users
- Developers — Validate addresses in UIs and backend. Clear error messages for debugging.
- Users — Verify before sending. Understand why an address is invalid.
Common Mistakes
- Valid-looking address fails — Check length (42 chars with 0x), hex characters only, and EIP-55 checksum. Mixed-case addresses must match the checksum pattern.
- Expecting generation — This tool validates. For checksummed output use Checksum Address Generator.
- Wrong length — 42 characters total including 0x. No spaces or line breaks.
- Forgetting to copy — Copy normalized or checksummed output before closing the tab.
Frequently Asked Questions
How does the address validator work?
The validator checks for the 0x prefix, correct length (42 characters), valid hexadecimal characters, and EIP-55 checksum compliance for Ethereum and EVM addresses.
What happens if my address is invalid?
The tool will display an error message and highlight which validation checks failed, helping you quickly identify and fix issues.
Is it safe to validate my address here?
Yes. All validation is performed client-side in your browser. No data is sent to any server.
Do I need to use a checksummed address for transactions?
Checksummed addresses are recommended for safety, but both checksummed and non-checksummed addresses work on-chain.
When should I use the address validator?
Use it before sending funds or integrating an address in a contract to catch typos and invalid checksums.
Why does a valid-looking address fail?
Check length (42 chars with 0x), hex characters only, and EIP-55 checksum. Mixed-case addresses must match the checksum pattern.
Conclusion and Try the Tool
Address Validator gives you fast, client-side validation: paste address, see pass/fail and which check failed. No server, no account. For checksummed form use Checksum Address Generator, for hashing use Keccak256 Hasher, and for calldata use ABI Encoder & Decoder.
Use the Address Validator tool to validate Ethereum and EVM addresses.