# LaTeX packages on Overleaf

Overleaf uses [TeX Live](http://www.tug.org/texlive/) for new projects and copies of existing projects, which provides about 4000 packages, including:

* Figures with [pstricks](https://en.wikipedia.org/wiki/PSTricks) and [TikZ](http://en.wikipedia.org/wiki/PGF/TikZ). Here are [some examples](https://www.overleaf.com/latex/examples/tagged/tikz).
* Bibliographies with [bibtex](http://www.bibtex.org/) and [biblatex](http://www.ctan.org/pkg/biblatex). Here are [some examples](https://www.overleaf.com/gallery/tagged/bibliography).
* Packages, such as `fontspec` that require XeLaTeX or LuaLaTeX for unicode and font support.

If a document class or package that you wish to use is not available in your project's version of TeX Live, in many cases you can upload the required `.sty` and `.cls` directly to your project.


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