> ## Documentation Index
> Fetch the complete documentation index at: https://docs.docwriter.org/llms.txt
> Use this file to discover all available pages before exploring further.

# PDFs and other files

> Open PDFs in tabs and preview generated files.

## Open a PDF

Click a PDF in the file tree to open it as an in-app viewer tab. PDF tabs do not create a text editor or Yjs document.

The PDF viewer supports page navigation, search, zoom, and the PDF sidebar. LaTeX projects can also use SyncTeX to move between source and PDF.

## Preview generated output

When the active source file has a matching output, **Preview window** opens it in a separate window. The button beside it opens a resizable split preview.

DocWriter can preview PDF, HTML, SVG, common image formats, Markdown, and plain text. The preview page also has a **Raw** action for opening the output in a normal browser window.

## Large and binary files

DocWriter copies imported binary data without decoding it as text. The text file API limits reads to 2 MB and reports when a response is truncated.

Read [Generated previews](/automation/preview) for hook output matching and live reload.