> For the complete documentation index, see [llms.txt](https://overleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://overleaf-pro.ayaka.space/latex/tex-latex-primitives/12-synctex.md).

# \synctex

The `\synctex` primitive is an addition to TEX provided by the [SyncTEX extension](https://ctan.org/tex-archive/support/synctex-parser?lang=en). SyncTEX can be activated, or deactivated, via a TEX engine command line option or from directly within a TEX source file via the `\synctex` primitive:

**Usage examples**

* to activate SyncTEX, use `\synctex=1` in your `.tex` file;
* to disable SyncTEX, use `\synctex=0` in your `.tex` file;

Quoting this description from [CTAN](https://ctan.org/tex-archive/support/synctex-parser?lang=en):

> Synchronization TeXnology, named SyncTEX is a feature of TEX engines. It allows synchronization between input and output, which means to navigate from the source document to the typeset material and vice versa. Here is how it works: during the typesetting process of `foo.tex`, the TEX engines write some geometrical information in an auxiliary file named `foo.synctex`, this information is then used by editors or viewers to navigate between input and output.

SyncTEX is supported by Overleaf.

#### Further information on SyncTEX

* [A TUGBoat article by Jérôme Laurens](http://www.tug.org/TUGboat/tb29-3/tb93laurens.pdf), SyncTEX’s author.
* The [GitHub repository](https://github.com/jlaurens/synctex) of the SyncTEX parser.


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