TeXbrain brings pdfTeX to the browser via WebAssembly with offline and git support

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A master's engineering student has built TeXbrain, a browser-based LaTeX editor that runs pdfTeX entirely client-side using WebAssembly, requiring no account or backend server. The tool was created as a free alternative to Overleaf after the developer found that git synchronisation on that platform sits behind a paywall. TeXbrain uses the File System Access API to read and write directly to a local project folder, allowing users to work with git, local TeX installations, or any other editor on the same files. Built-in git support is provided via isomorphic-git, and the editor functions fully offline after the initial load, with document content never transmitted over the network. Current limitations include support only for pdfTeX — excluding XeTeX and LuaTeX — packages pinned to the TeX Live 2020 era, and no BibTeX or Biber support yet.

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