Minting is the moment a digital file becomes an NFT. Before minting, it’s a JPEG, a video, or a music file sitting on your hard drive. After minting, it’s a unique token on a blockchain with a contract address, a Token ID, verifiable ownership, and the ability to be bought, sold, and transferred permanently.
The process itself takes under five minutes on most platforms. Understanding what’s actually happening during those five minutes – and which decisions affect your NFT’s long-term viability – is what separates a professional mint from a careless one.
What Happens During Minting
When you mint an NFT, several things happen simultaneously on the blockchain:
A new token is created with a unique identifier. This token lives at a specific contract address and carries a Token ID that distinguishes it from every other token in the collection.
Metadata is attached. The token points to a JSON file containing the NFT’s name, description, image URL, and attributes (traits). This metadata is what wallets and marketplaces display when someone views your NFT.
Ownership is recorded. Your wallet address is permanently logged as the creator and initial owner. This provenance record can never be altered.
The transaction is validated. Blockchain validators confirm the transaction, add it to a block, and the mint becomes permanent. On Ethereum, this uses proof-of-stake consensus. On Solana, it uses proof-of-history combined with proof-of-stake.
You pay a gas fee. The computational cost of processing and recording the transaction is paid to validators. This fee varies dramatically by blockchain.
Minting on Ethereum
Ethereum is the original and most established blockchain for NFTs. The ERC-721 standard governs how unique tokens are created and transferred.
Step 1: Connect MetaMask to a marketplace (OpenSea, Rarible, or Foundation). Make sure you have ETH in your wallet for gas fees.
Step 2: Click “Create.” Upload your file – PNG, JPEG, GIF, MP4, MP3, or SVG. Most platforms accept files up to 50MB.
Step 3: Fill in metadata. Name your NFT, write a description, and add properties/traits if applicable. For collections, traits like “Background: Blue” or “Accessory: Crown” are essential for filtering and rarity ranking.
Step 4: Set royalties. Choose a percentage (typically 5-10%) that you’ll earn automatically on every future resale through smart contracts.
Step 5: Confirm the transaction in MetaMask and pay the gas fee.
Gas costs on Ethereum range from $15-50 during normal traffic and can spike to $100+ during congestion. Minting during off-peak hours (weekends, early UTC mornings) can save 40-60%. Check Etherscan’s Gas Tracker for real-time prices.
Lazy minting on OpenSea and Rarible lets you skip the gas fee entirely. Your NFT is listed but not actually written to the blockchain until a buyer purchases it – at which point the buyer pays the gas. This is ideal for testing market demand without upfront costs.
Minting on Solana
Solana minting costs are negligible – typically under $0.01 per transaction. This makes it the preferred chain for experimentation and high-volume minting.
Using a marketplace: Phantom wallet connects to marketplaces like Magic Eden and Exchange Art. The process mirrors Ethereum – upload, add metadata, confirm.
Using Pump.fun (for fungible tokens and meme coins): While not technically NFT minting, Pump.fun’s bonding curve model handles token creation for approximately $2-5 in SOL.
Using no-code tools: Platforms like Metaplex, CandyMachine, and Smithii let creators mint Solana NFT collections with custom supply, traits, and royalties – all without writing code.
Solana uses the SPL token standard rather than ERC-721. Wallets like Phantom natively support SPL NFTs with gallery-style display.
Minting on Polygon
Polygon offers near-zero gas fees while maintaining compatibility with the Ethereum ecosystem. It’s the best option for creators who want Ethereum-compatible NFTs without the cost.
OpenSea supports Polygon minting natively. Select “Polygon” as the blockchain when creating your NFT, and gas fees drop to fractions of a cent. Your NFT is compatible with MetaMask and other EVM wallets.
Brands like Nike and Starbucks have used Polygon for NFT projects specifically because of the cost advantage.
Metadata and Storage: The Part Most People Skip
Where your NFT’s image is stored matters more than most creators realize.
On-chain storage embeds the image data directly in the smart contract. Permanent and tamper-proof, but expensive and limited to very small files. CryptoPunks use on-chain storage.
IPFS (InterPlanetary File System) is decentralized storage where files are addressed by content hash. As long as at least one node pins the file, it remains accessible. Most reputable marketplaces default to IPFS. Look for image URLs starting with ipfs://.
Arweave is permanent, pay-once storage. Files uploaded to Arweave exist forever. The gold standard for long-term NFT preservation.
Centralized servers host files on regular web servers. If the server goes down, your NFT’s image disappears. This is the riskiest option and should be avoided.
When minting, verify where your metadata will be stored. OpenSea uses IPFS by default. If you’re minting through a custom contract, configure IPFS or Arweave storage explicitly.
Post-Mint Checklist
After minting, take these steps to protect your NFT’s integrity:
Revoke unnecessary authorities (Solana). If you used a tool that gave you mint authority or freeze authority over the token, revoke them. Buyers see “Mint: Revoked” as a trust signal.
Verify metadata displays correctly. Check your NFT on the marketplace and in your wallet. Make sure the image loads, description is accurate, and traits appear properly.
Freeze metadata if the marketplace offers it. Frozen metadata can’t be changed, which protects buyers from bait-and-switch scenarios.
Share the listing. Your NFT exists on the blockchain but no one knows about it. Post on Twitter/X, share in relevant Discord communities, and tell your existing audience.
FAQ
How much does it cost to mint an NFT?
On Ethereum: $15-50+ in gas fees (free with lazy minting). On Solana: under $0.01. On Polygon: under $0.01. Marketplace fees are separate and typically deducted from the sale price, not the minting cost.
Can I mint an NFT for free?
Yes. OpenSea and Rarible offer lazy minting on Ethereum and Polygon where no upfront gas is required. On Solana, gas is so low it’s effectively free. The NFT is minted on-chain only when purchased, with the buyer covering the gas.
What file types can I mint as an NFT?
Most marketplaces accept PNG, JPEG, GIF, SVG, MP4, WEBM, MP3, WAV, GLB, and GLTF. File size limits vary – OpenSea allows up to 50MB. For best results, use high-resolution PNG for static images and MP4 for video.