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The \documentclass command selects the structure and default layout for a LaTeX document. Use article for papers without chapters, report for chapter-based reports or shorter theses, book for long two-sided works, and beamer for presentation slides.
Quick answer: choose by structure, not only by page count. If the document needs \chapter, start with report or book; article does not define that command.Basic syntax:Common default: when no publisher or university provides a required class, article is the safest starting point for an essay, assignment, or research paper.

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The \documentclass Command

This is the basic syntax:

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article vs report vs book vs beamer

If a journal, conference, or university supplies a .cls file or official template, use that required class instead of converting the document to a standard class.

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Standard Document Classes

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article

For short documents without chapters. Article Features:
  • No \chapter command
  • Abstract environment available
  • Compact formatting
  • Good for papers under 20-30 pages

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report

For longer documents with chapters. Report Features:
  • \chapter command available
  • Abstract environment included
  • Separate title page by default
  • Good for documents 20-100 pages

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book

For books and very long documents. Book Features:
  • Two-sided layout by default
  • Front matter, main matter, back matter
  • Parts and chapters available
  • Best for 100+ page documents

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beamer

For presentations and slides. Beamer Features:
  • Built-in themes and color schemes
  • Overlay specifications for animations
  • Navigation aids
  • PDF presentation format

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letter

For correspondence. Letter Features:
  • Automatic formatting for addresses
  • Date insertion
  • Signature placement
  • Standard letter conventions

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Document Class Options

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Font Size Options

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Paper Size Options

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Layout Options

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Title Page Options

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Equation Options

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Bibliography Options

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Custom Document Classes

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Creating Custom Classes

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Academic Document Classes

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Thesis Classes

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Journal Classes

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KOMA-Script Classes

Alternative to standard classes with enhanced features:

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Memoir Class

Highly customizable class for books and articles:

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Document Class Comparison

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When to Use Each Class

Best for:
  • Research papers (5-30 pages)
  • Journal submissions
  • Conference papers
  • Technical reports
  • Essays and assignments
Features:
  • No chapters
  • Compact layout
  • Abstract support
  • Bibliography integration

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Common \documentclass Errors

Do not rename a missing custom .cls file to article.cls or replace it silently. Publisher and university classes often contain required formatting and metadata rules.

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Best Practices

Document class selection tips:
  1. Follow submission requirements first — an official class overrides a general recommendation.
  2. Choose the required structure — chapter support and front matter matter more than a rough page count.
  3. Set regional defaults explicitly — declare paper size and any required one- or two-sided layout.
  4. Keep class options intentional — unsupported options are ignored and usually produce a warning.
  5. Compile early with the real template — class/package conflicts are easier to fix before the document grows.
  6. Review the class documentation — custom classes can redefine commands and defaults.

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Quick Reference

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Standard Classes Summary

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Common Options Summary

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Practice in LaTeX Cloud Studio

Open a project and choose a class

Start with article, report, or beamer in the browser editor and compile early to confirm the structure.

Templates that match the class

Use a working template when you want the document class and layout decisions already in place.
Next: Learn about LaTeX Packages to extend document functionality, or explore Document Structure for hands-on examples.