Live Preview runs a real LaTeX engine, compiled to WebAssembly, inside your browser. Your document recompiles as you type — there is no upload, no server queue, and no Compile button to press.

Turning It On

Open the preview pane and enable Live Preview from its toolbar. The engine downloads once on first use and is then cached, so later sessions start immediately. Because compilation happens on your own machine, speed depends on your hardware rather than on how busy the server is.

The preview never goes blank

The last successful render stays on screen while the next one builds. If a keystroke temporarily breaks your LaTeX, you keep seeing the last good output instead of an empty pane or an error screen.

Draft Mode

For long or graphics-heavy documents there is an optional Draft mode that renders a faster, approximate layout. It is intended for working on structure and prose, where you want the tightest possible feedback loop and do not need final typesetting accuracy on every keystroke.

Live Preview vs. Final Compilation

Live Preview ships a subset of TeX Live, not the whole distribution. That covers the overwhelming majority of documents, but a project using very unusual packages, custom fonts, or an exotic toolchain may render incompletely.

This is why TeXposit keeps both engines. Live Preview is for the writing loop; the Compile action still runs your project through a complete server-side TeX Live installation, and that is what produces the PDF you download and submit. If the two ever disagree, the server-side result is the authoritative one.

SyncTeX

Click anywhere in the preview to jump to the corresponding line in your source, and vice versa. This works in Live Preview the same way it does for server-compiled output, so you can navigate a long document by clicking the rendered page rather than scrolling the source.