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Paste a sentence or paragraph and choose how much to expand (2x–10x).
Expansion length
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3x expansion
Renewable energy is becoming cheaper, but many countries still rely heavily on fossil fuels.
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AI Sentence Expander
Turn short ideas into detailed, engaging writing
Expand sentences and paragraphs with AI while keeping your meaning. Choose how much detail to add, from a quick 2x clarify to a 10x deep elaboration, then export to GDoc, Word, or PDF.
- Perfect for essays, emails, and notes
- Control expansion length from 2x to 10x
- Adds context without changing your core idea
- Export to Google Docs, Word & PDF
- Free to use—no credit card required
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Your Text
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Expanded Preview
Original
Social media affects teen mental health, and experts disagree about how serious the risks are.
Expanded (3x expansion)
Social media platforms have become a central part of adolescent life, shaping how teenagers communicate, form identity, and spend leisure time. While some researchers emphasize benefits such as peer connection and access to information, a growing body of evidence links heavy use to anxiety, sleep disruption, and social comparison. Experts continue to debate how serious these risks are relative to other stressors, but most agree that platform design, parental guidance, and digital literacy all influence outcomes.
How It Works
From a short sentence to a fuller paragraph in 3 simple steps
AI Expands Instantly
Yomu adds detail, context, and flow while preserving your original meaning.
Original
Sleep loss hurts memory.
Expanded
Insufficient sleep impairs memory consolidation because the brain has less time to transfer information from short-term storage into stable long-term networks during rest.
Review & Export
Copy, download, or open in Google Docs to keep editing.
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Microsoft WordExport →
PDFExport →
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Example Expansions
See how Yomu develops short text into fuller paragraphs while keeping your meaning
Samples
Essay thesis — environmental policy· 5x expansion
Original
Carbon pricing is the most effective way to reduce emissions because it changes behavior at the source.
Expanded
Carbon pricing represents the most effective policy instrument for reducing greenhouse gas emissions because it internalizes the environmental cost of pollution at the point of production and consumption, thereby altering economic incentives across entire supply chains rather than targeting isolated sectors. Unlike voluntary corporate pledges or narrowly scoped regulations, a well-designed carbon tax or cap-and-trade system creates a persistent price signal that encourages firms to invest in cleaner technology, consumers to reduce energy-intensive purchases, and innovators to develop low-carbon alternatives. Empirical evidence from jurisdictions such as British Columbia and the European Union demonstrates measurable emission reductions following carbon price implementation, while revenue recycling mechanisms can offset regressive impacts on lower-income households. For these reasons, carbon pricing should be positioned as the cornerstone of any credible national climate strategy.
Expansion Lengths
Pick a scale, prefill sample text, then expand in the tool
How to Expand Sentences for Academic Writing
Sentence expansion develops your ideas with more context and detail—but only when you add substance that supports your argument. Use this checklist before you submit.
Expand to develop ideas—not to pad word count without substance- Check that new details still support your thesis or main claim
- Use lower scales (2x–3x) for topic sentences; higher scales for body paragraphs
- Compare the expansion to your original to catch meaning drift
- Cite sources when you add factual claims the original did not include
- Follow your course AI and academic integrity policies
Common scenarios
- Flesh out essay paragraphsGrow thin topic sentences into full body paragraphs before you draft.
- Clarify ESL draftsAdd structure and vocabulary without replacing your argument.
- Professional communicationExpand brief notes into complete, respectful emails.
- Creative & narrative writingAdd sensory detail and pacing to scenes and reflections.
Yomu AI vs. Manual Sentence Expansion
How does AI expansion compare to elaborating every sentence yourself?
Features
Manual Expansion
Time per paragraph
Length control
Meaning preservation
Academic tone
Export workflow
Continue in full editor
Yomu AI vs. Manual Sentence Expansion
How does AI expansion compare to elaborating every sentence yourself?
Features
Manual Expansion
Time per paragraph
Length control
Meaning preservation
Academic tone
Export workflow
Continue in full editor
Full writing workflow
Continue Your Writing Workflow
Expand sentences here, then use Yomu's free tools at each step—or finish in the editor with citations.
Open Yomu workspace →
Step 4 is this page; step 9 opens the full editor with citations and export.
Frequently asked questions
A sentence expander adds detail, context, and supporting points to short text while keeping your original meaning. It helps you develop ideas for essays, emails, and notes faster than writing every elaboration from scratch.
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