Crypto

Hash passwords with bcrypt and verify hashes — all client-side, cost-factor adjustable.

Convert Bitcoin to SGD, USD, EUR and more — with live rates updated every 60 seconds.

DCA vs lump-sum side-by-side, with crypto-specific volatility assumptions.

Calculate your crypto profit or loss — enter buy and sell prices to see your exact return on investment.

Coin growth + USD value scenarios + validator fee + US tax on rewards.

US crypto cap gains with NIIT + state tax stacking. ST vs LT bracket math.

APR→APY at any compounding frequency + gas-cost impact on net yield.

Convert between Wei, Gwei, ETH

Calculate Ethereum gas fees in ETH and USD — understand what you'll pay before you confirm any transaction.

Gwei × ETH price → USD per common tx type, with L1 vs L2 split.

Generate HMAC signatures with SHA-1, SHA-256, SHA-384 or SHA-512. Output as hex, base64 or base64url. All computation in your browser — your secret never leaves this page.

Calculate NFT creator royalty earnings

Generate 2048/3072/4096-bit RSA keypairs in PEM and JWK formats, in-browser.

Generate and verify TOTP codes (RFC 6238) entirely in your browser.