CertifyNFT — Mint Certificate NFTs on Ethereum Sepolia

Create Your NFT Certificate

Fill in the details below. Your certificate image is stored entirely on-chain as base64.

Certificate Details

Certificate Image

Drop your certificate here

or click to browse — PNG, JPG, WebP, PDF

PNG, JPG, WebP, or PDF — max 20MB raw. PDFs render their first page. Compressed to a small thumbnail (~6KB) to fit Ethereum Sepolia's gas limits for on-chain storage.

Certificate Title

Recipient Name

Issuer

Description (optional)

Issue Date

Requires Ethereum Sepolia testnet + Sepolia ETH for gas

Upload image to preview

Certificate Title

Recipient Name

Issuer

NFT Certificate

How it works

Image (or PDF first page) compressed & embedded as base64 in metadata
Metadata stored entirely on-chain (no IPFS)
Gas fees paid in Sepolia ETH (free from faucet)
Certificate verifiable on Etherscan forever

Connect Your Wallet

Connect your MetaMask wallet to start minting certificate NFTs on Ethereum Sepolia.

How It Works

Four simple steps to a blockchain-verified certificate.

1

Connect Wallet

Click "Connect Wallet" and approve the MetaMask popup. The app auto-switches to Ethereum Sepolia testnet.

2

Upload Image or PDF

Drag-and-drop an image or PDF. PDFs render their first page. Files compress to ~50KB and are stored entirely on-chain as base64.

3

Fill Metadata

Enter the certificate title, recipient, issuer, description, and date. See a live preview as you type.

4

Mint NFT

Click "Mint NFT", confirm in MetaMask, and receive a unique certificate NFT on Ethereum Sepolia. Free via faucet!

Your Certificates

All certificate NFTs minted by your connected wallet.

No certificates minted yet. Connect your wallet and mint your first one!

Mint Your Certificate as an NFT

Create Your NFT Certificate

Certificate Details

Connect Your Wallet

How It Works

Your Certificates

Mint Your Certificate
as an NFT