Sentence Case Converter

Automatically convert any text to proper sentence case — only the first letter of each sentence is capitalized. Ideal for fixing ALL CAPS pastes or reformatting paragraphs quickly.

What Does This Tool Do?

Sentence case means writing like a normal sentence — the first word starts with a capital letter, and everything else is lowercase (except proper nouns you add yourself). This tool takes any text — whether it's ALL CAPS, ALL lowercase, or mixed up — and reformats it so each sentence starts with a capital and the rest is lowercase. It detects sentence endings automatically by looking for periods, exclamation marks, and question marks.

Key Features

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Smart Sentence Detection

Automatically finds sentence boundaries using periods, exclamation marks, and question marks.

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Clean Output

Produces naturally readable text that looks like normal writing.

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Multi-Paragraph Support

Processes every sentence across all paragraphs simultaneously.

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Instant Results

Converts your entire text in milliseconds, no matter how long.

How to Use This Tool

Paste your text (in any case — ALL CAPS, lowercase, or mixed) into the Input box.
The tool automatically detects each sentence and capitalizes its first letter.
Review the output and copy it with the Copy button.

How It Works

The tool first converts your entire text to lowercase. Then it scans for sentence boundaries — the very beginning of the text, and any letter that immediately follows a period (.), exclamation mark (!), or question mark (?). Each sentence-starting letter is then switched to uppercase.

Common Use Cases

💡 Fixing Copy-Pasted ALL CAPS Text

Quickly reformat text pasted from PDFs or documents that use all capitals.

💡 Cleaning Up User Input

Normalize form submissions or user-generated content to consistent sentence case.

💡 Blog & Article Editing

Quickly reformat body text that was written or imported in incorrect case.

💡 Preparing Social Media Captions

Format captions and posts to read naturally with correct sentence capitalization.

Frequently Asked Questions

Will it capitalize proper nouns like names?

Not automatically — the tool only capitalizes the first word of each sentence. You'll need to capitalize proper nouns yourself after converting.

Does it handle multiple paragraphs?

Yes — every sentence across all paragraphs is detected and processed independently.

Related Tools

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