Direct link: https://katana.roninchain.com/

Click the Swap Menu

or click swap in Ronin Wallet

Example: Swapping from Ronin WETH to Ron

Click Connect Ronin Wallet

Read and agree to Terms of Service then click Connect Ronin Wallet button
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Select your Ronin wallet account with desired source funds and click Next button

Review and click Connect

After connecting, select amount to swap and click the Approve button

Select Free transaction. Daily the first 5 swaps to Ron are free

Click Confirm and wait for approval. Once done, click Swap to execute the swap

Review the estimates and click Confirm Swap if you approve

Click Confirm in wallet

Wait for the process to complete

Check your Ronin wallet balances to confirm or view on the blockchain explorer: https://app.roninchain.com/