Free Bitcoin tools that run in your browser.
25 tools live · all run client-side · no signup · no wallet connection · open methodology.
Every tool here runs entirely in your browser — your seed phrase, addresses, and transaction IDs never leave your device, and there's no account to create. They pull live data from public sources (mempool.space, blockstream.info, CoinGecko) and cite the BIPs and Bitcoin Core behaviour they implement. Built for the moments self-custody actually gets hard: a stuck transaction, a fee you're not sure about, a backup you need to verify, an address you want to double-check before you send.
The four tools most people open first.
- 01When your tx looks frozen
Is My Bitcoin Transaction Stuck?
Paste the txid → know if it confirms, needs RBF, or to wait
Open the tool → - 02Before you install
Wallet installer SHA-256 verifier (Ledger, Trezor, Sparrow)
Drop the installer → SHA-256 hash vs. the vendor's in seconds
Open the tool → - 03Before you press send
Bitcoin Address Validator
Paste an address → checksum + format check, fully offline
Open the tool → - 04When the paper looks wrong
BIP-39 Validator
Type the 12/24 words → checksum verify, no derivation
Open the tool →
Calculators
10 liveConversions, projections, accumulation plans.
- calculator
Bitcoin Fee Estimator
Estimate on-chain Bitcoin transaction fees for any wallet type and priority — with live mempool rates and USD conversion. No tracking.
- calculator
Bitcoin Mining Profitability Calculator
Estimate daily BTC mining revenue and profit from your hashrate, ASIC efficiency, and electricity cost. Live BTC price, current network parameters.
- calculator
DCA Calculator
Backtest dollar-cost-averaging into Bitcoin. Set your weekly or monthly amount and date range — see total sats stacked and value today.
- calculator
HODL Calculator
See what a past Bitcoin purchase would be worth today — yearly USD averages 2010-2025, client-side math, live price from coingecko.
- calculator
Inflation vs Bitcoin
See how much US dollar purchasing power has eroded since a chosen year — and what the same money would be worth today if held in Bitcoin instead.
- calculator
Lightning Fee Calculator
Estimate Lightning Network routing fees for any payment size. Adjustable hops, base fee, and ppm for realistic channel-policy scenarios.
- calculator
RBF Fee Bumper
Replace-by-fee calculator for stuck Bitcoin transactions. Enter original fee and desired rate — see the minimum valid replacement per BIP 125.
- calculator
Retirement in Sats
Estimate the sats you'd need to retire in cities worldwide — Bangkok, Lisbon, Tokyo, and more. Adjustable withdrawal rate, multiple price scenarios.
- calculator
Sats Converter
Convert sats, BTC, and fiat with live Bitcoin prices. All math runs client-side in your browser — no tracking. Permalinks for easy sharing.
- calculator
Stacking Plan
Plan your sats accumulation. Set a goal and deadline; see exactly how much to stack daily, weekly, or monthly at the current Bitcoin price.
Decoders
2 liveRead what an invoice, address, or script actually contains.
- decoder
BOLT 12 Offer Decoder
Decode BOLT 12 Lightning offers, invoices, and invoice-requests. The successor to BOLT 11 — supports static reusable offers and onion messages.
- decoder
Lightning Invoice Decoder (BOLT 11)
Paste a BOLT 11 Lightning invoice and see the amount, network, description, and expiry at a glance. Runs in your browser — no keys ever sent.
Validators
11 liveVerify checksums and formats — never trust, verify.
- validator
BIP-39 Validator
Paste a 12/15/18/21/24-word seed phrase. We check every word against the BIP-39 list and SHA-256-verify the checksum. Runs in your browser.
- validator
Bitcoin Address Validator
Paste any Bitcoin address and instantly see its type — Legacy, SegWit, or Taproot — with checksum verification. Runs client-side in your browser.
- validator
Bitcoin Self-Custody Score
Eight honest questions about how you actually store your Bitcoin. Get a score, a grade, and the single change that lifts you fastest. Client-side.
- validator
Bitcoin Watchtower
Watch-only theft alarm for cold storage. Email the minute a watched Bitcoin address moves, plus weekly proof it hasn't. No account, no KYC.
- validator
Exchange legit checker
Search 30+ major exchanges. See verified licenses, proof-of-reserves status, documented incidents, and warning flags for collapsed or fraudulent exchanges.
- validator
Is My Bitcoin Transaction Stuck?
Paste a txid and find out instantly: confirmed, pending, or stuck. Get fee-rate vs network, RBF eligibility, and the exact next step. Free, in your browser.
- validator
Lightning address verifier
Paste a Lightning address (alice@domain), fetch the LNURL-pay endpoint, validate the response, and cross-check against known providers. Catches typosquats.
- validator
Vanity Bitcoin Address Generator
Generate a Bitcoin Native SegWit address with a chosen short prefix. 100% client-side — your private key never leaves the browser.
- validator
Wallet installer SHA-256 verifier (Ledger, Trezor, Sparrow)
Drag any wallet installer to compute its SHA-256 in your browser, then compare against the vendor's official hash. Catch tampered or fake downloads.
- validator
What Kind of Bitcoiner Are You?
A 90-second quiz that plots you on the Bitcoin conviction compass and names your archetype — from The Sovereign to The Hostage. Runs client-side.
- validator
Which Hardware Wallet Should You Buy? Quiz
Answer 4 quick questions and get the Trezor hardware wallet that fits your budget, your device, and how you actually hold Bitcoin. Free and client-side.
Visualizers
2 liveSee on-chain and network data at a glance.
- visualizer
Bitcoin Mining Pool Comparison 2026
Compare Bitcoin mining pools side-by-side: payout schemes (FPPS, PPLNS, TIDES), fees, Stratum V2 support, and decentralization signals.
- visualizer
Bitcoin Power Law Projection
Visualize the Bitcoin power law model — support, fair value, and resistance bands projected through 2050. Educational, open-methodology, not a prediction.