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How Do You Move ETH from Ethereum Mainnet to an L2?

Moving ETH to an Ethereum L2 changes the network context. Use a verified bridge or supported exchange withdrawal route, confirm the destination chain and keep enough gas for both the source and destination workflow.

Last reviewed: 2026-10-05.

Key takeaways

• A bridge changes network context; a normal transfer does not.
• Verify the official bridge and exact destination chain before connecting.
• Source-chain gas is paid on Ethereum; destination transactions need gas on the L2.
• Exchange direct withdrawal can avoid a separate bridge transaction if the exchange supports that L2.
• Use a small test amount for a new route.

1. Choose the route: bridge or exchange withdrawal

A bridge is appropriate when ETH is already on Ethereum Mainnet and you want it on Base, Arbitrum, Optimism or another supported L2. A direct exchange withdrawal can be simpler when the funds are still on an exchange and the exchange offers the desired L2 as a withdrawal network.

Compare the complete route, not only the headline bridge fee: source gas, bridge fee, destination gas, time, token form and the cost of returning to Mainnet later can all matter.

2. Verify the bridge before connecting

Use the official documentation of the L2 or a bridge you have independently verified. Phishing sites frequently imitate bridge interfaces. A legitimate bridge connection should not require your seed phrase or private key.

Confirm source = Ethereum Mainnet and destination = the intended L2. Also check whether the output is native ETH or another representation and whether your destination wallet supports that network.

3. Review the source transaction

Bridging typically requires a transaction on the source chain. Check the amount, destination network and gas estimate before signing. Some token bridges require a separate approval transaction first; moving native ETH may follow a different flow.

After signing, keep the transaction hash and use the bridge's official status page or blockchain explorers to follow the transfer. Do not assume a temporarily missing destination balance means the funds are lost.

4. Confirm the destination balance and gas

Once the bridge/exchange route completes, switch the wallet to the destination L2 and verify the balance there. ETH on the L2 is a separate chain balance from ETH on Mainnet even when the account address looks identical.

Before using a dApp, confirm you have enough gas on that L2. Bridging a token without usable destination gas can leave you unable to perform the next transaction.

Safe bridge checklist

1. Verify the bridge domain from official L2 documentation.
2. Confirm Ethereum Mainnet as the source and the exact L2 as destination.
3. Review output asset, fees and expected timing.
4. Start with a small amount on a new route.
5. Keep the source TXID and bridge status reference.
6. Verify the L2 balance on the destination explorer.
7. Keep enough destination gas for the next action.

Common mistakes

• Thinking the wallet's network switch moves ETH.
• Connecting to a lookalike bridge from a search ad or message.
• Bridging to an L2 the receiving wallet/exchange does not support.
• Spending all Mainnet ETH and leaving too little for source gas.
• Arriving on the L2 without gas for the next transaction.