Web3 Tools
Browser-based utilities for Ethereum & blockchain development
Building on Ethereum means a lot of small, exact operations — checksumming an address, hashing with Keccak-256, decoding Base58, converting wei to ether. These tools do each one instantly in your browser, so addresses and payloads never leave your device.
Never paste a private key or seed phrase into any online tool, including these — they are for public data only.
Browse Tools
NFT Metadata Validator
Validate NFT metadata JSON against the common standards.
Wallet Address Validator
Check whether a wallet address is well-formed.
ETH Unit Converter
Convert between wei, gwei and ether.
EIP-55 Checksum Tool
Apply and verify the EIP-55 address checksum.
Keccak-256 Hash Generator
Hash any input with Keccak-256 (Ethereum's hash).
Base58 Encoder & Decoder
Encode and decode Base58 (addresses, keys).
Frequently asked questions
Are these Web3 tools safe to use?
Yes for public data like addresses and metadata — everything runs client-side and nothing is uploaded. Never enter a private key or seed phrase into any online tool.
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.