Web3 Tools

6 free web3 tools. Browser-based. No signup. Privacy-first.

Free No signup Client-side Privacy friendly

What is Web3 Tools?

Web3 tools are browser-based utilities for blockchain and Ethereum development — wallet-address and NFT-metadata validation, EIP-55 checksums, Keccak-256 hashing, Base58 encoding and ETH unit conversion. They run client-side, so keys and addresses never leave your device.

What are Web3 tools?

Build and debug on Ethereum and other chains: validate a wallet address or NFT metadata, apply an EIP-55 checksum, hash with Keccak-256, encode in Base58, or convert between wei, gwei and ether. Each runs instantly on input you control.

Because everything is client-side, sensitive values like addresses and payloads are processed locally and never uploaded.

Why client-side?

Privacy: sensitive data (API keys, payloads, passwords) never leaves your device.
Speed: no network round-trip — results appear as you type.
Reliability: works offline once loaded.
Cost: always free, no signup or rate limits.

Browse Web3 Tools

NFT Metadata Validator

Validate NFT metadata against ERC-721, OpenSea, and Solana Metaplex standards. Preview your NFT before minting.

Open tool

Wallet Address Validator

Validate Ethereum, Bitcoin (legacy + SegWit), Solana, TRON and Litecoin addresses. Format + checksum, no RPC.

Open tool

ETH Unit Converter

Convert between Wei, Gwei, Ether, Szabo, Finney and more. BigInt-safe — no rounding errors.

Open tool

EIP-55 Checksum Tool

Convert any Ethereum address to its canonical EIP-55 checksummed form. Detect typos before sending funds.

Open tool

Keccak-256 Hash Generator

Compute Keccak-256 digest (Ethereum's hash) of text or files. Different from SHA-3 — matches Solidity keccak256().

Open tool

Base58 Encoder & Decoder

Encode and decode Base58 and Base58Check. Supports text or hex input, used by Bitcoin, Solana, and IPFS.

Open tool

Prefer a focused tool?

Web3 → Browser-based utilities for Ethereum & blockchain development

Frequently asked questions

Are these Web3 tools safe to use with real addresses?

Yes for public data like addresses and metadata — everything runs client-side and nothing is uploaded. Never paste a private key or seed phrase into any online tool, including these.

What is an EIP-55 checksum?

EIP-55 mixes upper and lower case into an Ethereum address as a checksum, so a mistyped address is very likely to be detected. The checksum tool applies and verifies it.

Build, share, and grow on Zerethon Social

Free signup. Earn points, collect achievements, and connect with creators worldwide.