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Cryptography Tools

Encrypt and decrypt securely with browser-based tools. Work with AES/RSA, ciphers and keys while keeping your data private.

29 tools available

Blockchain Tools 19

DCA Calculator

Free DCA simulator: model crypto dollar-cost-averaging across 3 price-path scenarios. See harmonic-mean average cost, ROI, DCA vs lump-sum chart.

Crypto Profit/Loss Calculator

Calculate crypto profit, loss, ROI and break-even with buy/sell fees. Token-decimal-aware, BigInt-precise, 100% private, with CSV/JSON export.

Impermanent Loss Calculator

Calculate impermanent loss for Uniswap V2/V3, Balancer weighted & Curve pools. Compare LP vs HODL, add fee-APR break-even, export CSV. Free, in-browser.

ENS Resolver

Forward & reverse ENS resolver: .eth to EIP-55 address, primary name, avatar, multi-chain SLIP-44 & text records. Read-only, no wallet, fully client-side.

Keccak SHA3 Hasher

Free keccak256 online tool: compute 4-byte function selectors, event topic0 hashes, and EIP-55 checksum addresses. Keccak-256/512 and SHA3 in-browser.

ABI Encoder / Decoder

Decode Ethereum calldata and encode function calls online. Resolves unknown 4byte selectors, decodes tuples, structs, arrays and multicall on any EVM chain.

Checksum Address Converter

Validate, fix and batch-convert Ethereum addresses to EIP-55 checksum format. Keccak-256 mixed-case validation for ETH, BSC, Polygon. 100% client-side.

EVM Vanity Address Generator

Generate EVM vanity addresses client-side - private keys never leave your browser. Open-source secp256k1/Keccak-256, EIP-55 checksum, batch CSV/JSON export.

Lido Rewards Tracker

Track Lido stETH liquid staking rewards across multiple wallets. Daily rebase APR, compounded APY, net-of-fee yield and CSV tax export in USD/EUR/GBP.

APR to APY Converter

Convert APR to APY (and back) with daily, monthly, quarterly or continuous compounding. Compare effective yields for DeFi staking, savings accounts and lending.

Bitcoin Unit Converter

Convert BTC, satoshi, mBTC and bits with exact integer-satoshi math. Sat/vByte fees, millisatoshis, user-set fiat rates. Free, offline, no data sent.

EVM Transaction Decoder

Decode EVM raw tx hex client-side: read the function selector and ERC-20 calldata, spot approval-drain phishing, and verify EIP-1559 gas before you sign.

Staking Rewards Calculator

Calculate ETH staking rewards with live DefiLlama APY from Lido, Rocket Pool, Ether.fi, Aave V3. Net-of-fee daily, monthly, yearly. Private, in-browser.

Tokenomics Chart Builder

Build ERC-20 tokenomics pie charts with exact BigInt token math. Set vesting, TGE unlocks, decimals and export the allocation table to CSV or JSON.

BIP39 Mnemonic

Generate or validate BIP39 seed phrases (12-24 words), apply an optional passphrase (25th word), and derive the PBKDF2-HMAC-SHA512 512-bit seed hex.

Crypto Address Validator

Validate Bitcoin, Ethereum, Solana, Tron, Litecoin and 12 chains with real EIP-55, Base58Check and Bech32m checksum verification. Batch mode, CSV/JSON, in-browser.

Crypto Logo Library

500+ crypto logos in transparent PNG for portfolio trackers, exchange & wallet UI. Symbol-to-logo search plus one-click bulk JSON/CSV manifest export.

Ethereum Unit Converter

Convert between Wei, Gwei, Ether, Szabo, Finney and all EVM units precisely. Calculate gas costs from transaction parameters. Free dev tool, instant.

Mnemonic to Address

Derive HD wallet addresses, private keys (WIF/hex) and xpub from a BIP39 mnemonic for Bitcoin, EVM, Solana, BCH and more. 100% client-side.

Calculators 1

Financial Calculators 1

Stablecoin Yield Comparator

Compare stablecoin APY from Aave, Compound, Sky, Ethena, Pendle and Coinbase side by side. Risk-adjusted ranking, fees, inflation and basis-point gaps.

Developer Tools 9

Encoding 8

Base58 Encoder/Decoder

Free online Base58 encoder/decoder. Decode Base58 strings, IPFS CIDs and raw bytes to hex or UTF-8 text, and encode text or hex (Bitcoin alphabet).

Base64 Encoder/Decoder

Free Base64 encoder & decoder. Encode text or files, generate data: URIs, decode Base64URL/JWT, UTF-8 & MIME line wrapping. Fast, private, browser-based.

Hex Encoder/Decoder

Text ⇄ hex converter — plain, 0x-prefixed, space-separated, upper/lowercase. Auto-detects on decode, handles UTF-8. For debugging, memory dumps, colors.

JWT Encoder/Decoder

Decode JWTs and verify HMAC signatures (HS256/384/512) in-browser. Inspect header, payload, claims, and validate exp, nbf, and iat. Build and sign tokens too.

MD5 Hash Generator

Free MD5 hash generator and checksum verifier. Generate an MD5 from text and paste an expected MD5 to verify downloads — instant MATCH or MISMATCH.

SHA-1 Hash Generator

Generate a SHA-1 hash from text or a file and verify it against a published SHA1SUM checksum. Match/no-match verdict, runs locally via Web Crypto.

SHA-256 Hash Generator

Generate a SHA-256 hash from text or a file. Verify downloads against a published checksum without uploading the file. Runs locally via Web Crypto.

SHA-512 Hash Generator

Generate a SHA-512 hash from text or a file, then verify it against a published checksum. Runs 100% locally via Web Crypto — nothing is uploaded.

Generators 1

TOTP Generator

Free online TOTP / 2FA code generator and verifier (RFC 6238). Paste a Base32 secret to see live codes, scan the QR with any authenticator, and verify codes.