Free online tools
Small, fast, privacy-friendly tools that run entirely in your browser. No sign-up, no uploads.
UPI QR Code GeneratorTurn any UPI ID into a payment QR code that works with Google Pay, PhonePe, Paytm, BHIM and every UPI app. Download as PNG or SVG. Crypto Payment QR Code GeneratorBitcoin, Ethereum, USDT (ERC-20, TRC-20, Solana), USDC, Solana Pay and Lightning QR codes with amount and label. BIP-21, EIP-681 and Solana Pay formats, generated in your browser. Crypto Address Validator & ConvertersCheck Bitcoin, Ethereum, USDT, Tron and Solana addresses: network detection, checksum verification, EIP-55 checksum converter and Tron Base58 ↔ hex converter. Batch mode, in-browser. Crypto Unit ConvertersWei / gwei / ether, gas fee calculator, satoshi to BTC, lamports to SOL, sun to TRX and token decimals. Exact big-integer arithmetic, no rounding, no sign-up. Ethereum Developer ToolsABI encoder / decoder, function selector and event topic calculator, Keccak-256 / SHA3-256 hash, bech32 encoder / decoder and a big-number hex to decimal converter. All in-browser. Batch Transfer / Multisend (Testnets)Send ETH, ERC-20, SOL, SPL, TRX or TRC-20 tokens to many addresses in a few signed transactions with MetaMask, Phantom or TronLink. Sepolia, Solana devnet and Tron Nile; non-custodial, no fee. Gerador de QR Code Pix (Brasil)Crie um QR Code Pix estático para qualquer chave (CPF, CNPJ, e-mail, telefone ou aleatória), com valor opcional, e a string "Pix copia e cola". Tudo no navegador. Signature Verifier & Event Log DecoderVerify Ethereum personal_sign and EIP-712 signatures, Solana ed25519 and Bitcoin signed messages; decode EVM event logs (ERC-20, ERC-721, Uniswap and 40 more events) from topics and data. More Address ConvertersBitcoin Cash CashAddr, Cosmos bech32 prefixes, Polkadot SS58 and TON address forms, all checksum-verified in your browser. Raw Transaction DecoderPaste a raw Ethereum, Bitcoin, Solana or Tron transaction and see from, to, value, fees, calldata and signatures. Recovers the sender, computes the hash, decodes PSBT and Solana v0. In-browser. JSON & YAML Formatter, Validator and DiffFormat, validate, minify and convert JSON and YAML with the exact line of every missing bracket, comma or quote and one-click repair; compare two files by structure or text. In-browser, nothing uploaded.Guides
- How to find your UPI ID
- UPI QR code for your shop
- UPI QR code with a fixed amount
- Google Pay QR code generator · PhonePe · Paytm
- UPI QR कोड जनरेटर (हिन्दी)
- Ethereum address checksum (EIP-55) converter · Tron address converter · USDT address network check
- Gwei to ETH & gas fee calculator · Satoshi to BTC · Token decimals converter
- 加密货币工具（中文） · Русский · Español · 日本語 · 한국어 · Português
- Keccak-256 hash · Function selector · Bech32 decoder · Hex to decimal
- JSON validator · YAML validator · JSON diff · YAML to JSON · Text diff · JSON/YAML 工具（中文）