Smart Contract Gas Optimizer

WHAT IT DOES

Smart Contract Gas Optimizer analyzes your Solidity contract source code and identifies common gas inefficiencies. It scans for patterns such as unnecessary public variables, inefficient loops, storage reads inside loops, small integer types (uint8/uint16), missing unchecked blocks, expensive require statements, payable functions, memory vs calldata usage, missing immutable/constant declarations, and post-increment operators. Each suggestion is categorized by impact (high, medium, low) and includes a code example or the relevant snippet from your contract. This tool helps developers write more gas-efficient contracts before deployment, saving significant costs on mainnet. It reads the current network chain ID from your wallet provider for context, but the analysis itself is purely static and does not require an active RPC connection beyond network selection.

HOW TO USE

Connect your wallet using the "Connect" button (optional for network context). Select the target network (Ethereum Mainnet, Sepolia, Polygon, BSC, Arbitrum, Optimism, and testnets are supported). Paste your Solidity contract source code into the text area. Click "Analyze for gas optimizations" — the tool will scan the code and display a list of suggestions with impact ratings and code snippets. The entire operation is local — no code is sent to any server, and no transactions are signed or sent.

TECHNICAL MECHANISM

The tool uses static pattern matching on the source code to detect known gas inefficiency patterns. It scans for regex patterns such as public variable declarations, for loops, storage keyword usage, small integer types (uint8/uint16/uint32), unchecked block presence, require statements, payable functions, memory parameters, constant/immutable keywords, and increment operators. Each detected pattern is mapped to a known gas optimization recommendation drawn from Solidity best practices and the Ethereum Yellow Paper. The tool categorizes suggestions by impact based on typical gas savings. All analysis is performed client-side in JavaScript — no data leaves your browser. The tool uses ethers.js v5.7.2 for network context but does not make any on-chain calls during analysis.

WHAT IT CANNOT SEE

The tool cannot guarantee that the suggested optimizations will reduce gas costs in all execution contexts — gas costs depend on many factors including compiler version, optimization settings, and runtime conditions. It cannot detect gas inefficiencies that depend on runtime conditions or external contract interactions. It cannot verify that optimizations will preserve the contract's security or correctness. It is limited by the accuracy of the static analysis algorithms — false positives and missed optimizations are possible. It cannot analyze contracts that are not written in Solidity or that use assembly extensively. It cannot simulate gas costs or provide exact gas estimates.

PLEASE NOTE

This tool is for educational and rapid prototyping purposes. Always test optimizations thoroughly with Hardhat or Foundry before deploying. The tool does not persist any data; all state is lost on page reload. EVM chains only.