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OpenSea: Make and Sell NFT for Free!

OpenSea: Make and Sell NFT for Free!

OpenSea is an online marketplace where you can sell any digital “thing”; anything from your art, music, pictures, and memories, to virtual items, like in-game cards and properties. All you have to do is turn them into a specific digital form. We call that digital form a Non-Fungible Token or NFT, which you may have heard
about it.

Now you may ask “Are people really willing to pay for this stuff?” well, YES, A LOT!

In this article, we will talk about what OpenSea is, how it works, and how you can make your own NFTs and sell them to earn money!

So, keep on reading!

What is OpenSea

OpenSea is a marketplace where you can sell and buy any “thing” that is unique and digital. It can be something that is digital already like music, photos, or digital art. Or it can be something in real life that you’re trading in its digital form.

The items are sold in form of NFTs which we will explain later in this article. Until then, check the following example to get the idea of selling a real item as an NFT:

You have created this beautiful painting and you want to sell it as an NFT. You can take a picture of it, turn it into an NFT on OpenSea, and then send the original art to the buyer of your NFT. Or you can put some unique code in a microchip, put it anywhere in your art, and sell it as an NFT.

The second way is complicated but quite impressive because it also gives you a way to track the status of your art!

How Does OpenSea Work

To keep things simple, we’re not going to talk about any technical details. Just remember that OpenSea supports 3 blockchain networks: EthereumPolygon (scaling solution for Ethereum), and Klatyn.

To use OpenSea, you have to make an account:

  1. Go to and choose the wallet icon on the top right corner.
  2. You have multiple options but MetaMask would be a good start. Download and install MetaMask (app or browser extension). Now you can make a new wallet or import an existing one. Creating a new wallet is simple. Just follow the MetaMask
    instructions and you’ll be fine.
  3. And that’s it. You’ll be directed to your new account which you can customize. Remember that everything has to be recorded on the blockchain and your crypto wallet is there to help you with that. So it’ll ask you to “Sign” your transactions. For this, all you have to do is just click on the “Sign” button.

Here’s our 1LineCrypto account. I have changed the account’s name, profile picture, and banner using the Setting section.

For more details, check OpenSea’s guide on how you can connect your wallet to the platform.

What is a Non-Fungible Token (NFT)

A Non-Fungible Token or NFT is a digital item on a blockchain system. Each NFT is Unique, meaning there’s only ONE of it in the world. So if you are the owner of an NFT, there’s no other person in the world that has a similar NFT like yours.

To better understand the term non-fungible, consider dollar bills. There’s no difference between two $1 bills. They are both worth $1 and you can use either to buy a cola and it doesn’t make a difference. The technical term for this feature is Fungible. We call NFTs Non-Fungible because no two NFTs are the same. So you may be able to exchange one NFT for one cola, and the other for one house!

Now that you have a simple understanding of what an NFT is, let’s make our first NFT together.

How to Make My Own NFT

First, let’s make our collection:

  1. Simply click on your profile picture on the top right corner and select “My Collection”.
  2. Click on “Create a collection”.
  3. Fill in the required fields and choose a Category.
  4. Pick a blockchain and the cryptocurrencies you want to trade your NFTs for. Remember that Polygon blockchain is free and Ethereum blockchain has fees.
  5. Click on “Create”.

Great! now you can create your first NFT:

  1. Go to your OpenSea profile and click on the “Create” button next to your profile picture.

  1. Upload your file (an image, video, clip, music, or whatever it is you want to sell).
  2. Fill out the options accordingly and choose the collection you just made.
  3. At last, choose a blockchain for your NFT. I chose Polygon because it’s free. For Ethereum, you’ll need some Ether to be able to create (mint) your NFT. Ether is the main digital currency of Ethereum blockchain and you can buy it from different crypto exchanges like Binance or Coinbase using your credit card.
    The process is quite simple and most crypto exchanges offer beginner-friendly guides.
  4. Click on Create and Voila!

Congrats! you just made your first NFT!

To put your NFT for sale, select the NFT you want from your profile and click on the blue “Sell” button. It will take you to a new window where you can set the price and listing duration. As you can see, my NFT will be on sale for 7 daysfor a price of 0.1 ETH ($306.91).

Creating and selling NFTs on Polygon is free. Follow this tutorial to learn how you can make and sell your NFTs on the Polygon blockchain for free.


You don’t need to be a blockchain, crypto, or NFT expert to be a part of the NFT wave and benefit from it. Decentralized marketplaces, like OpenSea, allow you to directly interact with potential buyers or sellers in a secure way. Everything is recorded on the blockchain and you have the opportunity to make more money by offering your work to a bigger audience.







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