LaTeX AI: fix errors, equations and citations

LaTeX AI can explain a compile error, turn a rough equation into valid source, revise a paragraph without breaking its citation commands, and find the papers missing from your bibliography. The useful kind does more than suggest text: it edits your files, compiles the document and checks the PDF.

Nebula Writer is a desktop LaTeX editor built around that loop. Open a project folder, edit beside the compiled PDF, and ask Nebula Agent for a change. It edits the source, compiles, looks at the rendered pages, and shows you each change to accept or reject. Your files stay on your computer and compile there, with no compile limit tied to your plan. This guide shows how to set up a project and gives you four LaTeX AI prompts to start with.

What can LaTeX AI do in your project?

In Nebula Writer, LaTeX AI means Nebula Agent, which works beside your document. Give it your .tex and .bib files, then ask it to explain a compile error, revise a paragraph, format an equation, build a table from your data or fill in missing citations. It edits the source files in your project, compiles the document and looks at the rendered pages to check its own work.

Use @ to attach the files the agent needs and tell it which commands, labels and citation keys to preserve. For a build problem, ask it to read the log and explain the first error before editing.

Where LaTeX AI saves time

Most of the time in a LaTeX bug goes to finding the cause: reading a long log, tracing a line number back through \input files, and working out which package or brace is responsible. That is the step an agent speeds up most, because it can read the log and the source together and point to the line. You spend the time you save on what matters: reviewing the fix and the compiled pages.^†

What is local LaTeX?

Local LaTeX means that your computer runs the typesetting engine that turns source files into a PDF. Your project can remain a normal folder containing main.tex, chapter files, references.bib and images. You can back up that folder, track it with Git, or share it with another author.

There are three separate questions to ask about any local LaTeX editor with AI:

• Where are the files? In Nebula Writer, your document files stay in your project folder.
• Where does compiling happen? Nebula Writer builds the LaTeX document on your computer.
• Where does AI processing happen? Nebula Writer sends your request and the document content needed for it to its servers and AI provider.

So the agent needs an internet connection, while writing and compiling work on your computer. If you plan to write offline, compile once while connected so Tectonic can fetch the packages your project uses. The file handling guide explains exactly what is sent when you use the agent.

Why use Nebula Writer for LaTeX AI?

• No compile limit tied to your plan. Long theses and figure-heavy papers compile on your computer, with a 10-minute safety stop per compile step. Overleaf's free plan stops a compile after 10 seconds; see Nebula Writer vs. Overleaf.
• An agent that checks its own work. Nebula Agent compiles after an edit and looks at the rendered pages, so it can tell whether the error is gone or a table still runs off the page.
• Review every change. Accept or reject single changes in a .tex file, or discard the whole edit to go back to the restore point.
• Source and PDF together. Use Split to see both, and double-click the PDF to jump to the matching source line.
• Your project stays a normal folder. Keep using Git, your backups and your template's file layout.
• One agent for all your documents. The same agent edits Word, Excel and PowerPoint files, and can convert a LaTeX chapter to Word for a coauthor.

Set up a local LaTeX project

Start with a project you already have, or use your university or journal template. Keep the source, bibliography and figures together. For example:

paper/
  main.tex
  references.bib
  sections/
    introduction.tex
    methods.tex
    results.tex
  figures/
    results.pdf

In Nebula Writer:

1. Choose Open Folder and select the project folder.
2. Open main.tex, or the main file supplied by your template.
3. Choose Compile now to establish that the original document builds.
4. Choose Split to see the source beside the PDF.
5. Open the agent pane and attach the relevant files with @ when you ask for help.

Nebula Writer includes Tectonic, which downloads packages the first time a document uses them. If the file you are working on needs packages or tools that Tectonic doesn't provide, Nebula Writer installs TeX Live for you. You can also install it yourself under Settings → Files → LaTeX Engine. With TeX Live installed, Nebula Writer compiles through latexmk, which runs BibTeX or Biber and reruns LaTeX until cross-references settle. See the LaTeX documentation for engine setup, and our guide to writing a thesis in LaTeX on your computer for a longer project.

Four practical LaTeX AI prompts

Start with one bounded task. It is easier to review a fix to one environment than a rewrite of a chapter that also changes packages and bibliography settings.

1. Explain a compile error before changing anything

Compile @main.tex and explain the first error in the log. Identify the
source file and line, then propose the smallest fix. Do not edit yet.

After checking the explanation, ask the agent to apply that fix and compile again. If a new error appears, diagnose it separately. Our common LaTeX errors guide explains the messages you are most likely to encounter.

2. Revise prose while preserving commands

Revise the first two paragraphs of @sections/introduction.tex for clarity.
Keep the scientific claims and level of certainty unchanged. Preserve all
LaTeX commands, labels and citation keys. Do not add facts or references.

Read the changed text alongside the original, and watch words such as "may," "suggests" and "demonstrates": an edit can change the strength of a claim even when every command survives.

3. Format an equation without changing its meaning

In @sections/methods.tex, format the long equation in the Model subsection
across multiple lines using the existing amsmath package. Preserve every
term, symbol and label. Keep one equation number. Compile afterward.

Check the PDF for line breaks and numbering, then compare each term with the original source.

4. Find and add missing citations

Find every \cite key in @sections/results.tex that is missing from
@references.bib. Look up each paper, add a complete BibTeX entry with its
DOI, then compile and confirm there are no undefined citations.

Nebula Agent searches the web and academic papers to find each source, then writes the entries into your .bib file. Open the added entries in the review bar and check that each paper is the one you meant to cite.

Review the source and the compiled PDF

The agent writes changes to the files as it works. Nebula Writer keeps a restore point and shows a review bar; LaTeX edits can be accepted or rejected one change at a time. See how to review AI edits.

For each task, check the changed source and the affected PDF pages. Look for undefined references, missing citations, shifted figures, tables wider than the text, and equations that no longer match the surrounding explanation. You can also ask the agent to check a specific table or equation in the rendered pages after compiling.

Common questions about LaTeX AI and local LaTeX

Can I use AI with an existing LaTeX project?

Yes. Open the project folder in Nebula Writer and give the agent the files relevant to the task. Compile the original project first so you can distinguish an existing build problem from a problem introduced by an edit.

Does local LaTeX mean local AI?

No. Local LaTeX describes where the document compiles. Local AI describes where the model runs. Nebula Writer compiles locally and uses cloud AI, which receives your request and the document content needed to answer it.

Can LaTeX AI fix bibliography problems?

Yes. Nebula Agent explains BibTeX and Biber errors, fixes broken entries, and searches the web and academic papers to fill in missing authors, years and DOIs or add new entries. It then compiles so you can see the references resolve in the PDF. Prompt 4 above shows how to ask.

How do I move a browser-based project to local LaTeX?

Download the complete project source, extract it into a folder, open that folder and compile its main file. Include the .bib, class, style and figure files. Our Overleaf migration guide covers the process and compatibility checks.

Try LaTeX AI on your own project

Open a paper that already compiles and give Nebula Agent one job: fix the error that has been bothering you, tighten a paragraph, or turn a table of numbers into LaTeX. You will see the change in the source and the PDF before you keep it.

Editing and compiling are free, with a monthly AI allowance and no card to start. Pro is $25 a month for more AI.

Download Nebula Writer and open your project folder. Compare plans.