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Transaction Decoder

Paste a raw Ethereum transaction hex string and decode its fields. Supports legacy, EIP-2930 (type 1), and EIP-1559 (type 2) transactions. All processing runs locally in your browser.

Raw Transaction

Decodes as you type.

Quick Examples

How It Works

Every Ethereum transaction is broadcast to the network as a hex-encoded byte string. This tool parses that raw hex using RLP (Recursive Length Prefix) decoding to extract each field.

Transaction Types

TypePrefixDescription
Legacy0xf8... / 0xf9...Original format. Fields: nonce, gasPrice, gasLimit, to, value, data, v, r, s.
Type 1 (EIP-2930)0x01Adds access list. Fields: chainId, nonce, gasPrice, gasLimit, to, value, data, accessList, v, r, s.
Type 2 (EIP-1559)0x02Priority fee model. Fields: chainId, nonce, maxPriorityFeePerGas, maxFeePerGas, gasLimit, to, value, data, accessList, v, r, s.

Key Fields

  • Nonce — Sequential counter for the sender's account, preventing replay attacks.
  • Gas Limit — Maximum gas units the transaction can consume.
  • Gas Price — Price per gas unit in wei (legacy/type-1) or replaced by priority + max fee (type-2).
  • To — Recipient address. Empty for contract creation transactions.
  • Value — Amount of ether (in wei) transferred.
  • Input Data — Calldata for smart contract interactions, or empty for simple transfers.
  • v, r, s — ECDSA signature components used to verify the sender.

RLP Encoding

RLP is a serialization scheme used throughout Ethereum. It encodes nested arrays of byte strings. Single bytes below 0x80 encode themselves; longer strings use length prefixes; and lists use their own length-prefixed wrapper. The transaction decoder reverses this process to extract each field.

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