> ## Documentation Index
> Fetch the complete documentation index at: https://docs.celo.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Deploy on Celo with Remix

How to deploy a smart contract to Celo testnet, Mainnet, or a local network using [Remix](https://remix.ethereum.org/).

***

## Introduction to Remix

The [Remix IDE](https://remix-project.org/) is an open-source web and desktop application for creating and deploying Smart Contracts. Originally created for Ethereum, it fosters a fast development cycle and has a rich set of plugins with intuitive GUIs. Remix is used for the entire journey of contract development and is a playground for learning and teaching Celo.

In this guide, you will learn to deploy a smart contract on Celo using [remix.ethereum.org](http://remix.ethereum.org).

<Warning>
  For Celo L1 Remix does not support Solidity compiler version `0.8.20` and above for EVM versions above **Paris**. If you try to deploy a smart contract with a higher version, you will receive this error message:

  ```bash theme={null}
  Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?

  invalid opcode: opcode 0x5f not defined
  The EVM version used by the selected environment is not compatible with the compiler EVM version.
  ```

  A **workaround** is to go into the advanced settings for the compiler in Remix and choose Paris as the EVM version.

  For Celo Sepolia everything should be working as on every other EVM compatible chain.
</Warning>

<Tip>
  To learn more about the features available to you as a smart contract developer with Remix, visit the [Remix documentation](https://remix-ide.readthedocs.io/en/latest/).
</Tip>

## Create a Smart Contract

* Navigate to [remix.ethereum.org](http://remix.ethereum.org) and select **contracts > 1\_Storage.sol** from the **File Explorers** pane.
* Review the smart contract code and learn more using the [Solidity docs](https://docs.soliditylang.org/en/latest/) or with [Solidity by Example](https://solidity-by-example.org/).
* Complete any changes to your smart contract and save the final version (Command/Ctrl + S).

<Frame>
  <img src="https://mintcdn.com/celo-64ac69bd/oYb-8nnpFO3sIJto/img/doc-images/deploy-remix/image1.png?fit=max&auto=format&n=oYb-8nnpFO3sIJto&q=85&s=b28c7b755729bdbd9cd31f0c09b0049d" alt="github" width="1999" height="1267" data-path="img/doc-images/deploy-remix/image1.png" />
</Frame>

## Compile the Contract

* Choose the **Solidity Compiler Icon** on the left side menu.
* Check that your compiler version is within the versions specified in the **pragma solidity statement**.
* Select the **Compile** button to compile your smart contract.

<Frame>
  <img src="https://mintcdn.com/celo-64ac69bd/oYb-8nnpFO3sIJto/img/doc-images/deploy-remix/image2.png?fit=max&auto=format&n=oYb-8nnpFO3sIJto&q=85&s=f7a33a6e06c88cbd8cf211aac73258b7" alt="github" width="1999" height="1267" data-path="img/doc-images/deploy-remix/image2.png" />
</Frame>

## Deploy the Contract

* Click the **Deploy and Run Transactions Icon** on the left side menu.
* Choose **Injected Web3** as your environment.
* [Connect MetaMask to Celo](/wallet/metamask/use) testnet and verify that the environment reads:
  * **Custom (11142220) network** for Celo Sepolia testnet
  * **Custom (42220) network** for Celo Mainnet
* Click **Deploy** and select **Confirm** in the MetaMask notification window to pay for the transaction

<Frame>
  <img src="https://mintcdn.com/celo-64ac69bd/oYb-8nnpFO3sIJto/img/doc-images/deploy-remix/image3.png?fit=max&auto=format&n=oYb-8nnpFO3sIJto&q=85&s=8af06d0f6d60d962d3c593adbbe15ea6" alt="github" width="1999" height="1267" data-path="img/doc-images/deploy-remix/image3.png" />
</Frame>

## Interacting with the Contract

* Select the **dropdown** on the newly deployed contract at the bottom of the left panel.
* View the deployed contract’s functions using the **Deployed Contracts** window.
* Select functions to read or write on the Celo testnet using the function inputs as needed.
* Confirm write transactions in the **MetaMask Notification Window** to pay the transaction’s gas fee.

<Frame>
  <img src="https://mintcdn.com/celo-64ac69bd/oYb-8nnpFO3sIJto/img/doc-images/deploy-remix/image4.png?fit=max&auto=format&n=oYb-8nnpFO3sIJto&q=85&s=9e3fb25f82dcd09a9da0fdee4d3b981d" alt="github" width="1999" height="1267" data-path="img/doc-images/deploy-remix/image4.png" />
</Frame>

## View Contract Details

* Copy the contract address from the **Deployed Contracts** window on the left panel.
* Navigate to the [Celo Block Explorer](https://celo.blockscout.com/) and use the contract address to search for your contract.
* Explore the details of your deployed smart contract and learn more about the explorer [here](http://docs.blockscout.com).

<Frame>
  <img src="https://mintcdn.com/celo-64ac69bd/oYb-8nnpFO3sIJto/img/doc-images/deploy-remix/image6.png?fit=max&auto=format&n=oYb-8nnpFO3sIJto&q=85&s=63cbd93448955aab8c1c7dd62572f3ae" alt="github" width="1999" height="1267" data-path="img/doc-images/deploy-remix/image6.png" />
</Frame>

## Verify Contracts on Celo

* [Using Blockscout](/developer/verify/blockscout)
* [Using Remix](/developer/verify/remix)
* [Using CeloScan](/developer/verify/celoscan)
* [Using Hardhat](/developer/verify/hardhat)