GALAXY OF TOOLS

CRYPTO SECTOR · 34 TOOLS

Free Crypto & Web3 Tools

Wallet address checks, EIP-55 checksums, gwei and satoshi converters, DCA and staking maths, ABI decoding. 34 free tools, no sign-up.

Addresses & names5

Crypto Wallet Address ValidatorDetect the chain and verify the checksum of BTC, ETH, LTC, DOGE, BCH, TRX, SOL, XRP, DOT, ADA, ATOM and XMR addresses.Crypto & Web3BIP39 Mnemonic CheckerCheck a BIP-39 phrase’s word count, words and checksum, look up word numbers, or make a new test phrase.Crypto & Web3Ethereum Address Checksum ConverterConvert an address to EIP-55 checksummed form, verify mixed-case addresses and see why each letter is capitalised.Crypto & Web3Public Key to Address ConverterTurn a secp256k1 public key into its Bitcoin (legacy, SegWit, Taproot) and Ethereum addresses, offline.Crypto & Web3ENS Name NormalizerNormalise an ENS name, flag confusable characters, and compute its namehash, labelhashes and token ID.Crypto & Web3

Units3

Token Unit ConverterConvert raw base units to human token amounts and back for any decimals: USDC 6, WBTC 8, SOL 9, ETH 18.Crypto & Web3Gwei to ETH ConverterConvert wei, gwei, szabo, finney and ETH exactly, and estimate a gas fee from gas units × gas price.Crypto & Web3Satoshi to BTC ConverterConvert satoshis, bits, mBTC and BTC exactly, and work out a transaction fee from sat/vB × virtual bytes.Crypto & Web3

Calculators22

Bitcoin Investment CalculatorWhat a past bitcoin purchase is worth now: coins bought, value, profit, multiple and CAGR from your dated prices.Crypto & Web3DCA CalculatorSee units bought, average cost and value of regular buys over your own price series, compared with a lump sum.Crypto & Web3Staking Rewards CalculatorEstimate staking rewards from APR or APY, compounding and validator commission, or find the APR a target needs.Crypto & Web3Ethereum Gas Fee CalculatorGas × (base fee + tip) in ETH and your currency for transfers, token sends, swaps and mints, with an L2 view.Crypto & Web3Crypto Capital Gains Tax Calculator (US)US federal tax on crypto sales for 2026: FIFO or specific-ID lots, short vs long-term rates, NIIT and losses.Crypto & Web3Crypto Market Cap CalculatorPrice a coin would have at a target market cap or another coin’s market cap, and the market cap of a target price.Crypto & Web3Crypto Tax Calculator (UK CGT)UK Capital Gains Tax on crypto: same-day, 30-day and section 104 pooling, £3,000 allowance, 18% and 24% rates.Crypto & Web3Crypto Leverage CalculatorProfit, ROE %, fees and funding for a leveraged crypto long or short, with break-even and target exit prices.Crypto & Web3Bitcoin Halving CountdownEnter the current block height to see blocks left until the next halving, its estimated date, rewards and supply.Crypto & Web3Bitcoin Retirement CalculatorHow many BTC — or what monthly buys — fund your yearly spending for N years, on a price path you choose.Crypto & Web3Solana Transaction Fee CalculatorSolana network fee in lamports and SOL from signatures, compute unit limit and priority fee per CU.Crypto & Web3Crypto Liquidation Price CalculatorLiquidation and bankruptcy price for a leveraged long or short, isolated or cross, from your maintenance rate.Crypto & Web3Bitcoin Mining CalculatorBTC and money earned per day, power cost, pool fee, break-even and payback from your hashrate and electricity price.Crypto & Web3TRC-20 Transfer Fee CalculatorEnergy and bandwidth for a TRC-20 token transfer, the TRX burned without stake, and the extra cost for new holders.Crypto & Web3Crypto Funding Rate CalculatorFunding paid or received on a perpetual long or short over any holding period, with the annualised rate.Crypto & Web3Crypto Loan LTV CalculatorLTV, margin-call and liquidation prices for a crypto-backed loan, plus the collateral to add or loan to repay.Crypto & Web3Crypto Mining CalculatorCoins and profit per day for any proof-of-work coin from your hashrate, network hashrate, block reward and power.Crypto & Web3Crypto Arbitrage CalculatorNet profit of buying on one exchange and selling on another, or a triangular loop, after every fee you enter.Crypto & Web3Crypto Lot Size CalculatorLots to trade on BTCUSD and other crypto CFDs for a set risk and stop-loss, with your broker’s contract size.Crypto & Web3Bitcoin Power-Law Fair Price CalculatorThe power-law trend price for any date, its ±1σ/±2σ bands and when the trend line reaches a price. A model, not advice.Crypto & Web3Impermanent Loss CalculatorImpermanent loss for 50/50 or weighted pools, fee APR from volume and TVL, and whether fees beat holding.Crypto & Web3Concentrated Liquidity Range CalculatorToken amounts, liquidity L, capital efficiency and impermanent loss for a v3-style price-range position.Crypto & Web3

Data & contracts4

NFT Metadata ViewerPaste ERC-721 or ERC-1155 metadata JSON (or a data: URI) to preview the card, validate it and rewrite ipfs:// links.Crypto & Web3Ethereum Signature VerifierRecover the signer of a personal_sign (EIP-191) or EIP-712 signature and check it against an address, offline.Crypto & Web3Keccak-256 Hash GeneratorKeccak-256 of text, hex, abi.encodePacked or abi.encode values, plus 4-byte function selectors and event topics.Crypto & Web3Contract ABI DecoderPaste a contract ABI to list function selectors and event topics, decode calldata into named values and encode a call.Crypto & Web3

Check addresses, convert units and do the maths, offline

Cryptocurrency has no customer service desk: a payment to a mistyped address is gone, and a seed phrase pasted into the wrong website empties a wallet. These free crypto tools are built for careful users. The wallet address validator checks that a Bitcoin, Ethereum, Litecoin, Solana or other address is correctly formed and which network it belongs to before you send; the Ethereum address checksum tool converts an address to its EIP-55 mixed-case form and verifies one you have been given; and the ENS name normalizer applies the ENSIP-15 rules so you can see whether a .eth name contains look-alike characters.

Unit conversions trip up even experienced users. The gwei to ETH converter turns gas prices into ether and a fiat estimate, the satoshi to BTC converter works in the other direction for Bitcoin, and the token unit converter handles any ERC-20 token by its decimals, so a raw balance of 1500000 with six decimals reads as 1.5. Data tools include the contract ABI decoder, which turns transaction input data into a readable function call and arguments, and the NFT metadata viewer, which displays the JSON and image behind a token.

All of these run in your browser with nothing sent to a server. The address checks, checksums and unit maths need no network at all and can be used with the connection switched off. None of the calculators is investment advice; they show arithmetic on the numbers you give them, and crypto assets can lose value quickly.

Calculators for planning

  • Regular buying. The DCA calculator shows what a fixed amount bought at regular intervals would have cost on average, using prices you enter or paste, and compares it with a single purchase. Past prices say nothing about future ones.
  • Liquidity pools. The impermanent loss calculator works out how a pool position compares with simply holding the two assets after a price change, before and after fees.
  • Staking. The staking rewards calculator compounds a stake at the rate and frequency you enter, and shows how much of the result depends on the rate assumption.
  • Profit and halving. The crypto profit calculator includes fees in a buy-and-sell result, and the Bitcoin halving countdown estimates the next halving date from the current block height and average block time.

Security practices these tools assume

  • Never type a real seed phrase into any website, including this one. The BIP39 mnemonic checker validates word spelling and the checksum of a phrase so you can test a practice phrase or a single doubtful word; the page repeats this warning and is designed to be used offline for anything sensitive.
  • Validate the address, then verify it another way. A valid format only proves the address is well-formed, not that it belongs to the person you think.
  • Send a small test amount first for any new address, and check the network: an address that is valid on Ethereum is also valid on other EVM chains, which is where tokens go missing.
  • Decode the transaction before you sign it. The ABI decoder shows what a contract call actually does, which is the only way to know what “Confirm” in a wallet pop-up means.
  • The hash generator and Bitcoin QR generator are also here: hash a file to check a wallet download, and make a payment QR code from an address and amount.

Crypto & Web3: frequently asked questions

Is it safe to paste a wallet address here?

Yes. A public address is designed to be shared, and the validator checks it in your browser without sending it anywhere. Private keys and seed phrases are different: never paste a real one into any website.

Why does the BIP39 checker exist if I should never enter a seed phrase?

To check a practice phrase, a single word you cannot read on a backup, or a phrase you have just generated offline on an air-gapped machine. The page works with the network off, states the risk plainly, and keeps nothing.

What does the EIP-55 checksum do?

It encodes a check into the capitalisation of an Ethereum address. Wallets that understand it reject an address with a typo instead of sending funds to nowhere; the tool converts any address to this form and tells you whether a mixed-case address passes.

Do the calculators give investment advice?

No. They do arithmetic on the prices, rates and amounts you enter and show the assumptions. They do not predict prices, recommend assets or account for tax, and crypto assets can fall to zero.

Where do prices and block heights come from?

The converters work from figures you enter. Where a page offers a live price or block height, it says which public source it reads and the time of the figure, and it works without that source if you type the number yourself.