⚗️ Workshop experiment
Paste your .tex source below. The Doctor reads through it as you type and
tells you which syntax errors and common mistakes are hiding inside — with a line number and a
plain-English explanation for each one. Click any finding to jump straight to that line.
Nothing leaves your browser — everything is checked locally, and your draft is kept in this browser only so it survives a refresh. The diagnosis updates while you type; press Ctrl/⌘ + Enter to re-run it at once. Tab indents — press Esc first if you want Tab to move on to the next control.
Paste some LaTeX on the left — the Doctor checks it as you type.
{ needs a matching }.\begin{...} needs a matching
\end{...} with the same name, in the right order.$...$, $$...$$,
\[...\] or \(...\), and stray closing delimiters.\begin{document} without a
\documentclass, or a \documentclass without a
\begin{document}.&, _ or
# outside math mode, a table, or a macro definition, where LaTeX would stop with
an error.\includegraphics,
\textcolor or \toprule used without the \usepackage
that provides them.\beign or \begin{enumarate}.Comments (%), verbatim/lstlisting blocks and
\verb spans are skipped, exactly as LaTeX skips them, so they never raise false alarms.
The Doctor reads syntax only: it does not compile anything, so it cannot know whether your packages
are installed, whether a referenced file exists, or whether a macro is defined elsewhere. Treat a
clean bill of health as “no obvious syntax problems”, not as a guaranteed successful build.