Crypto Tools
Ethereum Address Validator
Validate Ethereum addresses and generate EIP-55 checksums instantly. Free, private, no upload.
APY ↔ APR Calculator
Convert between APR and APY with any compounding frequency. See how compounding frequency affects yield instantly. Free, private.
DCA Calculator
Simulate dollar-cost averaging investments. Plan recurring purchases, track cumulative cost basis, and visualize your DCA schedule over time. Purely illustrative — no price data.
Satoshi / BTC Converter
Convert between satoshi, bits, mBTC, and BTC instantly. Optionally enter a BTC price to see USD value. Everything runs in your browser.
ETH Unit Converter
Convert between wei, kwei, mwei, gwei, szabo, finney, and ETH. Optionally add a price for USD value. Client-side, private.
Bitcoin Address Validator
Validate Bitcoin addresses in your browser. Supports P2PKH, P2SH, Bech32, and Taproot. Checksum verified locally — address never leaves your device.
Staking Rewards Calculator
Estimate staking rewards over any period. Enter stake amount, APY, and compound frequency to see total rewards and month-by-month growth.
Crypto Tax P&L Calculator
Calculate realized crypto gains using FIFO cost basis. Enter buy and sell transactions, get short-term vs. long-term P&L, and export to CSV. Not tax advice.
Portfolio Rebalancer
Enter your current holdings and target allocations to see what to buy or sell to rebalance. Calculates drift and required trades. Runs in your browser.
BIP39 Seed Phrase Validator
Validate BIP39 seed phrases against the official 2048-word English wordlist. Word-by-word feedback. Never share your real seed phrase with any site.
Crypto Payment QR Generator
Generate Bitcoin, Ethereum, Solana, or Litecoin payment QR codes using standard URI schemes (BIP-21, EIP-681). Download as PNG. Runs in your browser.
Crypto Denomination Reference
Reference table for Bitcoin (satoshi → BTC), Ethereum (wei → ETH), and Solana (lamport → SOL) units. Optionally enter a price to see USD values.
BIP39 Seed Phrase Validator
Validate 12 or 24-word BIP39 seed phrases. Check each word against the official wordlist, validate checksums, and get suggestions for typos. Runs entirely in your browser.