How to Use Google Docs Headings, Outline and Table of Contents

You open a ten-page assignment the night before it is due, and you need one paragraph near the end. You scroll, you skim headings that all look the same size, and you lose your place twice. That is the real cost of a long document with no structure: the words are there, but finding them takes longer than reading them.

In this guide

• How to apply Heading 1, Heading 2 and Heading 3 styles
• How to open the document outline
• How to jump between sections from the outline
• How to insert a table of contents
• How to update a table of contents after edits
• Common mistakes to avoid
• Quick check before you finish
• Final thoughts

In this guide, the example is one class assignment all the way through: a short project report called Our School Garden Project. It has four main sections, and one of them has two smaller parts. Keeping the same example makes it easy to see how a heading in one step shows up in the outline and the table of contents in the next step.

How to apply Heading 1, Heading 2 and Heading 3 styles

A heading style does two jobs at once: it makes a line look like a heading, and it tells Google Docs that the line is a heading. That second job is the one that matters here, because only real heading styles appear in the outline and the table of contents.

Start with the four main sections of the garden report. Give each one Heading 1: Why we started the garden, What we planted, What we learned, and What we will do next. These are the big turns in the report, so they sit at the same level.

Then look inside What we planted. It has two smaller parts, Vegetables and herbs and Flowers for bees. Give each of those Heading 2, so a reader can see at a glance that they belong inside What we planted, not beside it.

Use Heading 3 only when a Heading 2 part needs a still smaller split. In this report, for example, a short note on watering under Vegetables and herbs could be Heading 3. If you have no smaller split, leave Heading 3 out. A tidy outline needs fewer levels, not more.

1. Click in the line you want to turn into a heading, or select that line.
2. Click Format, then Paragraph styles.
3. Click the style you need: Heading 1, Heading 2 or Heading 3.
4. Click Apply ‘Heading 1’, Apply ‘Heading 2’ or Apply ‘Heading 3’, matching the style you chose.
5. Repeat for each section heading, working from the top of the document down.

Do not fake a heading by making Normal text bold and larger. It may look right on the page, but Google Docs will not treat it as a heading, so it will stay out of the outline and out of the table of contents. If a line is missing later, this is the first place to check.

How to open the document outline

Once the headings are in place, the outline gives you a short map of the whole report on the left of the screen. It lists only headings, in order, with Heading 2 lines tucked under their Heading 1 section.

1. Open the garden report in Google Docs.
2. Click View, then Show outline.
3. Look at the panel on the left. You should see the four Heading 1 sections, with Vegetables and herbs and Flowers for bees under What we planted.

You can also open the same panel with the Show outline button at the top left of the document. Either way, you get the same list. If the panel is empty, the document has no heading styles yet, so go back and apply them before you do anything else.

Read the outline as a test of the report itself. If a section title sounds vague there, it will sound vague to a reader too. Fix the heading in the document, and the outline will show the new wording at once.

How to jump between sections from the outline

The outline is not just for looking at. Each heading in it is a link to that part of the document, so you can move around a long report without scrolling through every page.

1. With the outline open, find the section you need. For this example, find What we learned.
2. Click that heading in the outline.
3. Google Docs moves straight to that heading in the document, ready for you to read or edit there.
4. Click another outline heading whenever you need to move again. The outline stays open while you work.

This helps most when you are checking one detail. Say a teacher asks what the class learned about watering. Instead of scrolling past the planting notes, click What we learned in the outline and check that paragraph in seconds.

If clicking an outline heading lands you in the wrong place, check the heading itself. A heading that was typed in the wrong spot, or a Heading 2 that should have been a Heading 1, will send you to the wrong spot too. Fix the heading, and the jump will follow it.

How to insert a table of contents

The outline helps you while you work. A table of contents helps a reader who opens the finished report, because it sits inside the document itself, near the top, where anyone can see it.

1. Click in the document where you want the table of contents. For the garden report, put it just after the title and before Why we started the garden, on its own blank line.
2. Click Insert, then Page elements, then Table of contents.
3. Choose one of the layouts shown for the table of contents.
4. Check that the table lists the four Heading 1 sections, with the two Heading 2 parts under What we planted.

Each entry in the table of contents is a link, just like the outline. A reader can click What we will do next and go straight there, without hunting through the report.

Put the table of contents in before you share the report, not as an afterthought at the very end. A contents list at the end is easy to miss, and it does not help a reader who is still deciding where to start.

How to update a table of contents after edits

A table of contents does not change by itself when you edit the headings. That is easy to forget, and it is how a report ends up with a contents list that names a section that no longer exists.

Try it with the garden report. Add a new main section after What we planted and give it Heading 1, with the title Costs and materials. Now the document has five main sections, but the table of contents still shows four.

1. Click inside the table of contents in the document.
2. Click Refresh, the circular refresh icon that appears with the table.
3. Check the table again. Costs and materials should now appear in the right place, between What we planted and What we learned.

Use the same refresh step after you rename a heading or remove a section. The table will then match the headings as they are now, not as they were when you first inserted it.

Changing ordinary body text does not need a refresh, because the table lists headings only. Save the refresh step for heading changes: a new heading, a renamed heading, or a deleted section. To remove the whole table, right-click it and click Delete table of contents.

Common mistakes to avoid

• Making a heading bold and large in Normal text, then wondering why it never appears in the outline.
• Giving every section Heading 1, so the outline looks flat and no part is clearly inside another.
• Jumping from Heading 1 straight to Heading 3 for a small point, which makes the outline nesting look out of step.
• Inserting a table of contents before any headings are applied, so the table has nothing useful to list.
• Adding or renaming a heading and forgetting to click Refresh, so the table of contents stays out of date.
• Checking the table of contents for a missing section when the real problem is a heading that was never styled.

Quick check before you finish

Before you share the garden report, run through this short check. Open the outline and count the four Heading 1 sections, plus the two Heading 2 parts under What we planted. Click one outline heading and make sure you land on the right section. Then look at the table of contents and confirm it shows the same headings, after a Refresh if you changed anything. If a section is missing from both lists, it is almost always a line that still needs a heading style.

Final thoughts

Next time you start a long document, set the headings first, even if the wording is rough. Type the section titles, give them Heading 1 and Heading 2, and fill in the body text after. The outline and the table of contents will then grow with the document, instead of needing a rescue at the end. For the garden report, that one habit turns ten pages of scrolling into a short list you can click through.

Related guide

To review a document once its structure is set, see also: How to Use Google Docs Comments and Suggestions to Review a Document in 20 Minutes.

If the same assignment also means keeping notes in order, see also: Best Free Note-Taking Apps for Students.