Question 1

What is an EVM decompiler?

Accepted Answer

An EVM decompiler converts deployed Ethereum Virtual Machine bytecode back into a human-readable, high-level representation — usually Solidity-like pseudocode. It helps auditors, researchers, and developers analyze contracts when verified source code is missing.

Question 2

Is this EVM decompiler free to use?

Accepted Answer

Yes. The BuonaLabs EVM Decompiler is free for online use. Paste a contract address or bytecode, pick a chain, and decompile without installing software or connecting a wallet.

Question 3

How do I decompile an Ethereum smart contract?

Accepted Answer

Enter the contract address, select Ethereum (or the correct chain), and run decompile. The tool fetches bytecode from chain RPC endpoints, runs analysis server-side, and returns decompiled output, disassembly, and metadata tabs.

Question 4

Can I decompile bytecode without an address?

Accepted Answer

Yes. Switch to Bytecode mode and paste hex runtime or creation bytecode. This works for offline samples, mempool data, or bytecode extracted from traces.

Question 5

Is decompiled Solidity the same as the original source?

Accepted Answer

No. Output is pseudocode reconstructed from bytecode. Variable names, comments, and some structure are lost. It is meant for analysis and auditing, not guaranteed recompilation.

Question 6

Which chains does this decompiler support?

Accepted Answer

All major EVM-compatible networks including Ethereum, Arbitrum, Optimism, Base, Polygon, BSC, Avalanche, Scroll, Linea, zkSync Era, and testnets such as Sepolia.

Question 7

Is my contract data stored?

Accepted Answer

No. Analysis runs on BuonaLabs servers for the duration of your request. We do not persist contracts, bytecode, or decompilation results after processing completes.

Question 8

EVM decompiler vs disassembler — what's the difference?

Accepted Answer

A disassembler lists EVM opcodes (instruction-by-instruction). A decompiler goes further by reconstructing higher-level control flow and Solidity-like functions. This tool provides both views.

Optimism Decompiler

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