LaTeX Online Editors: Overleaf, CoCalc, and Cloud-Based Writing

Introduction

Online LaTeX editors eliminate the need to install TeX distributions locally (which can be 3-5GB). They provide instant compilation, real-time collaboration, and access from any device. This guide covers the best options and how to use them effectively.

Overleaf: The Industry Standard

Overleaf is the most widely used online LaTeX editor, with over 12 million users. It’s the default choice for academic writing and collaboration.

Getting Started

1. Create a free account at overleaf.com
2. Click “New Project” → choose a template or blank project
3. Write in the left panel, see the compiled PDF on the right
4. Share with collaborators via a link

Key Features

Real-time collaboration:

Share → Anyone with the link can edit
Share → Invite specific people by email

Rich template library:

• IEEE, ACM, Springer journal templates
• Thesis templates for hundreds of universities
• CV/resume templates
• Beamer presentation templates

Git integration (paid plans):

# Clone your Overleaf project locally
git clone https://git.overleaf.com/your-project-id

# Push changes back
git push

Dropbox and GitHub sync (paid plans):

• Sync your project with a GitHub repository
• Edit locally in VS Code, compile on Overleaf

Overleaf Keyboard Shortcuts

Overleaf Pricing

Many universities provide free Overleaf Professional access — check with your library.

Tips for Overleaf

% Use \input{} to split large documents into files
% main.tex
\documentclass{article}
\begin{document}
\input{chapters/introduction}
\input{chapters/methods}
\input{chapters/results}
\end{document}

% Track changes (Overleaf Pro)
% Use the "Track Changes" toggle in the Review panel
% Changes appear highlighted; collaborators can accept/reject

CoCalc: Full Linux Environment

CoCalc provides a complete Linux environment in the browser — not just LaTeX, but Python, R, Jupyter notebooks, and a terminal.

Features

• Full terminal access (bash, Python, R, etc.)
• Jupyter notebooks alongside LaTeX
• Real-time collaboration
• Time travel (version history)
• LaTeX with SageMath integration

When to Use CoCalc

• You need to run Python/R code alongside your LaTeX document
• You want a full Linux environment without local setup
• You’re teaching a course that uses multiple tools

# CoCalc terminal — full Linux
$ python3 --version
$ R --version
$ pdflatex --version
$ latexmk -pdf document.tex

Authorea: Integrated with arXiv

Authorea is designed for scientific publishing with direct arXiv and journal submission integration.

Features

• Direct submission to arXiv, bioRxiv, PLOS, and others
• Inline commenting and review
• DOI assignment
• Data and figure hosting
• Supports both LaTeX and rich text editing

Best For

• Preprint submissions (arXiv, bioRxiv)
• Collaborative scientific papers
• When you need integrated data/figure hosting

Papeeria: Simple and Fast

Papeeria is a lightweight alternative to Overleaf with a clean interface.

Features

• Free plan with unlimited projects
• Real-time collaboration
• Git integration
• Fast compilation

Pricing

• Free: unlimited projects, 1 collaborator
• Paid: more collaborators, priority compilation

Local Editor + Overleaf Sync

Many users prefer editing locally (VS Code, Emacs, Vim) and syncing to Overleaf:

VS Code + LaTeX Workshop

# Install LaTeX Workshop extension in VS Code
# Install TeX Live or MiKTeX locally

# .vscode/settings.json
{
  "latex-workshop.latex.tools": [
    {
      "name": "latexmk",
      "command": "latexmk",
      "args": ["-pdf", "-interaction=nonstopmode", "%DOC%"]
    }
  ]
}

Overleaf + GitHub Sync

1. Overleaf → Menu → GitHub → Connect to GitHub
2. Create a new repository or link existing
3. Push/pull changes between Overleaf and GitHub
4. Edit locally, push to GitHub, Overleaf auto-syncs

Choosing the Right Tool

Common Issues and Solutions

Compilation timeout (free Overleaf)

% Reduce compilation time:
% 1. Use \includeonly{} to compile only specific chapters
\includeonly{chapters/introduction}

% 2. Use draft mode (faster, no images)
\documentclass[draft]{article}

% 3. Cache bibliography
% Use biber instead of bibtex for faster runs

Large files

# Compress images before uploading
convert image.png -quality 80 image_compressed.jpg

# Use PDF images (vector, smaller than PNG for diagrams)
\includegraphics{diagram.pdf}

Collaboration conflicts

# Overleaf handles conflicts automatically
# If two people edit the same line simultaneously,
# Overleaf shows a conflict marker — resolve manually

Resources

• Overleaf Documentation
• Overleaf Templates
• CoCalc Documentation
• Authorea
• LaTeX Workshop for VS Code