Mirror is a web3-based publishing platform that enables users to publish written content on the decentralized web. It leverages web3 technologies such as Ethereum for login authentication, Arweave for storing content on the permaweb, and its own credibly-neutral protocol for publishing. Mirror allows writers to mint their posts as collectible NFTs, fostering a community around their ideas. The platform provides a web3-worthy editor with NFT embedding capabilities and supports wallet-based subscriptions for content. It is designed to support collaboration and is DAO-native, empowering decentralized autonomous organizations. Mirror ensures protocol-guaranteed ownership of data and content, and its contracts are optimized for efficient use of gas. With easy login using a web3 wallet and open accessibility, Mirror offers a powerful yet user-friendly toolkit for web3 publishing.