Crypto Tools
Validate Bitcoin and Ethereum addresses, convert between crypto units (satoshi, gwei, wei), check BIP39 seed phrases, calculate staking rewards, and track DCA strategies. Every tool runs in your browser — no address, seed phrase, or transaction data ever leaves your device.
APY ↔ APR Calculator
Convert between APR and APY with any compounding frequency. See how compounding frequency affects yield instantly. Free, private.
Crypto ToolsNewBcrypt Hash Generator & Verifier
Hash and verify passwords using bcrypt entirely in your browser. Choose salt rounds 8–14. Your input never leaves your device. Free.
Crypto ToolsNewBcrypt Simulator
Simulate bcrypt password hashing and verification in the browser. Choose a cost factor, generate a hash, or verify a plain-text password against an existing hash — all client-side via bcryptjs.
Crypto ToolsNewBIP39 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.
Crypto ToolsNewBitcoin Address Validator
Validate Bitcoin addresses in your browser. Supports P2PKH, P2SH, Bech32, and Taproot. Checksum verified locally — address never leaves your device.
Crypto ToolsNewCrypto Denomination Reference
Reference table for Bitcoin (satoshi → BTC), Ethereum (wei → ETH), and Solana (lamport → SOL) units. Optionally enter a price to see USD values.
Crypto ToolsNewCrypto 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 ToolsNewCrypto 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.
Crypto ToolsNewDCA 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.
Crypto ToolsNewETH Unit Converter
Convert between wei, kwei, mwei, gwei, szabo, finney, and ETH. Optionally add a price for USD value. Client-side, private.
Crypto ToolsNewEthereum Address Validator
Validate Ethereum addresses and generate EIP-55 checksums instantly. Free, private, no upload.
Crypto ToolsNewHMAC Generator
Generate HMAC-SHA-256 or HMAC-SHA-512 signatures from a secret key and message using the Web Crypto API. Fully client-side — your key and message never leave the browser.
Crypto ToolsNewPassword Strength Checker
Check how strong your password is instantly. Analyzes length, character variety, and common patterns. 100% private — runs in your browser.
Crypto ToolsNewPortfolio 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.
Crypto ToolsNewSatoshi / BTC Converter
Convert between satoshi, bits, mBTC, and BTC instantly. Optionally enter a BTC price to see USD value. Everything runs in your browser.
Crypto ToolsNewSHA-256 Hash Generator
Generate a SHA-256 hash from any text or string instantly in your browser. Free, private, no data sent to any server.
Crypto ToolsNewStaking 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 ToolsNewText Encryptor
Encrypt and decrypt text using AES-256-GCM with PBKDF2 key derivation, entirely in your browser. No upload, no server, no account — your text and password never leave your device.
Frequently Asked Questions
- Is it safe to enter a seed phrase or private key into a browser tool?
- Only if the tool is verifiably client-side. Open DevTools → Network tab before entering any sensitive crypto data and confirm zero outbound requests. brevio crypto tools make no network requests during processing. For seed phrase validation, additionally disconnect from the internet before entering.
- Do these tools store any wallet addresses or transaction data?
- No. brevio crypto tools run in your browser and store nothing. No data is sent to a server, logged, or persisted between sessions.
- Are conversion calculations exact for large numbers?
- Yes. Ethereum unit conversions use BigInt arithmetic to handle the full range of wei values (up to 10^77) without floating-point rounding errors. Bitcoin and Solana conversions use exact integer arithmetic.
- Do these tools provide financial advice?
- No. Calculators (DCA, staking rewards, APY) illustrate mechanics and estimates — they are not financial advice. Actual returns depend on market conditions, protocol parameters, and tax treatment. Consult a qualified financial professional.