How to Mint and Create NFT on OpenSea Marketplace

What is an NFT?

NFT stands for non-fungible token. An NFT is a unique digital asset that represents real-world objects like art, music, videos, etc. They are minted on a blockchain, which provides proof of ownership and authenticity.[1]

Some key properties of NFTs:

  • They’re one-of-a-kind and not interchangeable with each other.
  • They contain identifying information recorded on a blockchain.
  • Ownership and authenticity can be easily verified.
  • They’re durable, portable, and easy to trade.

What is OpenSea?

OpenSea is the largest marketplace for buying, selling, and minting NFTs.[2] Some key facts about OpenSea:

  • It’s a decentralized, non-custodial platform built on the Ethereum blockchain.
  • Over 80 million NFTs have been traded on OpenSea worth over $20 billion.[3]
  • It supports multiple blockchains and cryptocurrencies.
  • Anyone can mint, buy, sell, and trade NFTs on OpenSea.

Step 1: Set Up a Crypto Wallet

To mint an NFT on OpenSea, you’ll first need to set up a crypto wallet that supports Ethereum and ERC-721 tokens.[4]

Some popular options are:

  • Metamask: Browser extension and mobile app wallet. Easy to set up.
  • Coinbase Wallet: Mobile and web wallet by major crypto exchange.
  • WalletConnect: Connects desktop apps to mobile wallets.

Make sure to store your wallet’s seed phrase securely. This will allow you to recover your wallet if needed.

Step 2: Get Ethereum for Gas Fees

Minting an NFT requires a small transaction fee called “gas” to process the transaction on the Ethereum blockchain. This is paid in Ethereum’s native cryptocurrency, Ether (ETH).

You’ll need around $10-30 worth of ETH in your wallet to get started.[5] Some ways to get ETH:

  • Buy on an exchange: Exchanges like Coinbase let you easily buy crypto with fiat currency.
  • Earn from faucets: Services like Crypto Faucet distribute small amounts of free crypto.
  • Get transferred from a friend: If you know someone that owns crypto they can send you some ETH.

Step 3: Create an OpenSea Account

Head over to and connect your crypto wallet to create an account. Use the same wallet that contains your ETH.

This will allow OpenSea to read the NFTs you mint and list them for sale on your profile page automatically.

Step 4: Upload Your NFT

Once your wallet is linked, you can start adding NFTs to OpenSea.[6]

  • Click “Create” and select “My Collections”
  • Click “Add new collection” and fill out details like logo, description etc.
  • After creating the collection, click “Add item”
  • Upload your file (JPEG, PNG, GIF, MP4, etc) and add a title and description

Step 5: Mint Your NFT

After uploading all the details for your NFT, it’s time to mint it onto the Ethereum blockchain.

  • At the bottom, enable blockchain transactions and select “Create”
  • A popup will show the gas fee needed, click “Sign” to approve
  • An Etherscan link will appear once it’s processing
  • Your NFT is now minted!

The NFT will also appear in your OpenSea profile and collection for buyers to see.

Step 6: List Your NFT For Sale

To put your NFT up for sale:

  • Go to your NFT on OpenSea and click “Sell”
  • Choose between an auction or fixed-price listing
  • Enter the price and duration
  • Complete the listing and your NFT will appear on OpenSea’s marketplace

You will pay a 2.5% transaction fee when it sells.

Tips for NFT Success

Here are some tips from experts for launching a successful NFT collection on OpenSea:[7][8]

  • Create social media hype: Promote your NFTs across platforms like Twitter to drive interest.
  • Offer early supporters perks: Giveaways, whitelist spots, and early access opportunities for loyal followers.
  • Partner with influencers: Pay key opinion leaders in your niche to showcase your NFTs.
  • Add utility: NFTs with access benefits sell for more, like membership perks or exclusive content.
  • Improve scarcity: Limiting the number of NFTs in your collection makes them seem more valuable.


I hope this guide gives you a comprehensive overview of what an NFT is and exactly how to mint one for free on OpenSea marketplace! Let me know if you have any other questions.