How to Write a Summary: 2026 Guide + Free AI Summarizer

Learning how to write a summary is one of the most useful skills for studying, working and communicating. This 2026 guide condenses the method into 5 practical steps, includes a summary types table, opening phrases ready to use, a before/after example, and access to a free automatic summarizer for urgent cases.

Quick answer

To write a summary follow 5 steps: read the text, identify main ideas, drop the secondary detail, draft in your own words, and review. The ideal summary keeps between 10% and 25% of the original length and uses your own vocabulary.

📖 Read ✏️ Synthesize ✍️ Draft 🔍 Review 📏 25% length

The short answer: 5 steps + the 25% rule

Before diving into each step, this is the mental sequence every good summary follows. Apply it in order and the result is always clear, faithful and concise.

📖

Read

✏️

Underline

🗂️

Outline

✍️

Draft

🔍

Review

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Original

→

Summary

What is a summary and what is it for?

📝 Definition

A summary is a faithful, objective synthesis of a text, written in your own words, that preserves the main ideas and drops the secondary detail. Its typical length is 10% to 25% of the original.

📚

Study

🧪

Abstract

💼

Report

📱

Social

Summary types: length and purpose

Before drafting, identify which type of summary you're writing — each has its own length and tone conventions. This table covers the six most common types across academic and professional contexts.

Type	Length	Purpose	Typical example
📝 Informative	25% of original	Study, exams, comprehension	Chapter summary
🎨 Descriptive	100-200 words	Catalog, library	Book card
🧪 Abstract	300-500 words	Scientific paper, thesis	Paper abstract
🎬 Synopsis	50-150 words	Film, literature, marketing	Back cover blurb
💼 Executive	500-1000 words	Business, presentation	Executive summary
🗺️ Mind map	Visual	Personal study	Graphic outline

5 steps to write a good summary

These five steps are the backbone of every summary, from a blog post to a thesis abstract. Follow the order — skipping a step almost always shows up in the final result.

📖 Read the original (twice)

First read for context: catch the topic and tone. Second read analytically: look for the main thesis and the arguments that support it.

✏️ Underline main ideas

One main idea per paragraph (sometimes two). Distinguish essentials from details, examples or quotes — the latter rarely make it into the final summary.

🗂️ Build an outline

Arrange the underlined ideas into a vertical outline: introduction, thesis, arguments, conclusion. The order doesn't always match the original — go with what's most logical.

✍️ Draft in your own words

Close the original and write the summary looking only at your outline. This forces your own vocabulary and prevents unconscious copying. To speed things up, try the automatic summarizer first and then edit the result by hand.

🔍 Review and verify

Check three things: fidelity (no added nuance), length (10-25% of original; measure it with the word counter) and absence of opinion.

Opening phrases for your summary (by type)

Starting a summary is where most students stall. These are the four most common opening formulas, sorted by the kind of text you're summarizing.

📖

Narrative

"The text narrates…"
"The novel tells the story of…"
"The piece describes…"
"In this novel…"
"The protagonist…"

⚖️

Argumentative

"The author argues that…"
"The text claims that…"
"The central thesis is…"
"The article holds…"
"Against this view…"

📊

Expository

"This document describes…"
"The chapter covers…"
"This article discusses…"
"The text explains…"
"It presents…"

🧪

Scientific abstract

"This study investigates…"
"This work analyzes…"
"Results show…"
"We conclude that…"
"The methodology used…"

Before vs after: a real example

The difference between a text and its summary is clearest with a concrete example. Below is a ~250-word fragment and its 30% summary, keeping every central idea but stripping the examples and secondary nuances.

📜 Original text 248 words

Reading is an activity that transforms the brain in profound ways. When a child learns to recognize letters, the visual cortex develops specialized circuits that do not exist in people who have never read. These circuits convert abstract marks into sounds and meanings at a speed that feels almost instantaneous, yet actually takes years of practice to consolidate. The average reading speed of an educated adult in English hovers around two hundred and forty words per minute in silent reading. However, this figure varies greatly depending on the type of text: a philosophical essay demands more attention than an adventure novel, and a technical manual reads slower than a personal letter. The brain adjusts its pace based on complexity and purpose. Scientists who study reading have discovered something curious: the real human limit is near six hundred words per minute. Beyond that boundary, comprehension drops sharply and the reader starts to skip essential information. Speed-reading methods that promise one thousand or two thousand words per minute tend to confuse genuine reading with shallow scanning. Improving reading speed requires patience. The most effective techniques combine visual expansion exercises, gradual elimination of subvocalization, and daily practice with varied texts. With a few months of conscious training, an adult can increase reading speed by twenty to thirty percent without sacrificing comprehension.

✨ Summary

74 words ↓ 70%

Reading transforms the brain by building specialized visual circuits after years of practice. An educated adult reads ~240 words per minute in English, with variation based on text complexity. The real human ceiling is near 600 WPM: beyond it, comprehension collapses. Speed-reading methods promising 1,000+ WPM are actually scanning. With consistent training in visual expansion and reduced subvocalization, an adult can lift reading speed 20-30% without losing comprehension.

Notice what was kept: the central thesis (reading reshapes the brain), the key quantitative data (240 WPM, 600 WPM, 20-30%), the techniques (visual expansion, subvocalization), and the warning about speed reading. What was dropped: examples (essay vs novel), nuances ("years of practice to consolidate") and redundant connectors.

Ideal length: how many words should it have?

The 25% rule is a strong starting point, but context wins. This table sums up the most common lengths by destination, with links to our format-specific guides.

Context	Typical length	Related guide
📱 Social media post	50-280 words	—
📰 Blog intro / review	150 words	Blog length ↗
📖 Book synopsis	200-500 words	How many words in a book ↗
🧪 Thesis abstract	300-500 words	How many words is a thesis ↗
📝 School essay summary	150-300 words	College essay length ↗
💼 Executive summary	500-1000 words	—
🎓 Class notes summary	250-500 words	—

7 common mistakes to avoid when writing a summary

Knowing the most frequent errors saves rewriting drafts. These are the seven failures that show up over and over in academic and professional summaries.

❌ Error 1

Copying literal phrases from the original without paraphrasing.

❌ Error 2

Adding opinions or value judgments of your own.

❌ Error 3

Shifting the topic: a summary doesn't interpret beyond the text.

❌ Error 4

Using first person ("I think", "I believe").

❌ Error 5

Mirroring the structure paragraph-for-paragraph.

❌ Error 6

Including examples and quotes that aren't main ideas.

❌ Error 7

Exceeding 25% of the original's length.

Frequently asked questions about writing a summary

How many words should a summary have?

A good summary runs 10% to 25% of the original length. For a 1,000-word article, the ideal summary is 100-250 words. For an 80,000-word book, an editorial synopsis is around 500.

How do you start a summary with a good sentence?

The most common opening phrases are "The text describes/narrates/analyzes/argues...", "The author claims...", "This article discusses...". Avoid starting with "I think" or "In my opinion": a summary does not express personal views.

What is the difference between a summary and a synthesis?

A summary keeps the structure and order of the original, condensing its ideas. A synthesis reorganizes ideas under its own logic and can integrate multiple sources. Every summary is a synthesis, but not every synthesis is a literal summary.

Can you use first person in a summary?

No. A summary is neutral and objective. Using "I think" or expressing an opinion defeats its purpose. The only exception is when the author's own first-person quote is included verbatim with attribution.

How do you summarize a long book?

Break the book into chapters, summarize each in 50-100 words, then merge those micro-summaries applying the 25% rule. An 80,000-word book is reasonably summarized in 500-2,000 words depending on the destination (synopsis, review, abstract).

What is the 25% rule for summaries?

The 25% rule says a summary should stay between 10% and 25% of the original's length. Below 10% loses fidelity; above 30% it stops being a summary and becomes an extended paraphrase.

How can I summarize text automatically online?

Use our free text summarizer: paste your text, choose the compression level, and get the summary instantly. Useful as a starting draft you then edit by hand or to check whether your manual summary captured the main ideas.