Cite Extract is a VS Code extension that extracts the citation keys actually used in your Markdown/Quarto/LaTeX document, then filters your existing bibliography database (CSL-JSON or BibTeX) to export a smaller, cited-only bibliography file. It never modifies your source document or the original bibliography—only writes a new exported file.
Key features:
Supports Markdown/Quarto (Pandoc) citations like [@key] and inline @key
Supports common LaTeX commands such as \cite{...} (and \nocite{*} to export all)
One status-bar button for quick export (default: CSL-JSON, configurable to BibTeX)