15 tools
Validate Bitcoin and Ethereum addresses, convert between crypto units (satoshi, gwei, wei), check BIP39 seed phrases, calculate staking rewards and rebalance your portfolio. Every tool runs in your browser: no address, seed phrase or transaction data ever leaves your device.
Check an address before you send. Format and checksum, verified locally.
Satoshis, wei, gwei and lamports with exact arithmetic, no rounding errors.
Yield, staking and rebalancing. Mechanics illustrated, not a prediction.
Hashes, signatures and symmetric encryption using the browser Web Crypto API.
Every one of them runs entirely in your browser and makes no network requests while computing: you can confirm this by opening your developer tools' network tab before typing anything. Even so, for the most sensitive material, such as a seed phrase or an API key with trading permissions, the recommendation remains not to type it into any web page, however local the computation.
No. None of the tools stores what you type: there is no server to send it to, nothing is written to localStorage and nothing persists between sessions. The only thing recorded is that you opened the tool, for CryptoLV's progress system.
Yes. Unit conversions use big-integer arithmetic over each chain's smallest unit, so 1 ETH is exactly 10^18 wei and no rounding errors appear even with thirty-digit values. The financial calculators do use floating point, because they work with rates and prices that are approximate to begin with.
No. The yield, staking and rebalancing calculators illustrate the mechanics with the figures you enter. They do not predict real outcomes and do not account for protocol risk, price movement, fees or the tax rules where you live.
Because they share the same foundation. SHA-256 is the function Bitcoin's proof of work is built on, HMAC is how exchange API requests are authenticated, and bcrypt and AES are what separate a protected account from a compromised one. They are grouped separately so the distinction stays visible.
