# Sentence Case Converter

Convert text to Sentence case: capitalize the first letter of each sentence and lowercase everything else. Auto-restores the standalone pronoun "I".

> Canonical page: https://elysiatools.com/en/tools/sentence-case-converter

- **Category:** Text Processing

- **Keywords:** sentence case, sentencecase, capitalize sentence, first letter capital, lowercase body text

## Overview

Convert text into **Sentence case** — the style used in prose: the first letter of every sentence is capitalized, and everything else is lowercased.

**How it works:**
- Sentences are detected by their ending punctuation: `. ` `! ` `? `.
- The first alphabetic character after each sentence boundary is capitalized.
- All other letters are lowercased — this is what makes sentence case look "calm and uniform".
- The standalone pronoun **I** (and its contractions `I'm`, `I'll`, `I've`, `I'd`) is restored to uppercase automatically, since lowercasing it would be incorrect.

**Good to know:**
- Sentence case is ideal for body text, paragraphs, descriptions, and anywhere readability matters more than visual emphasis.
- Because everything non-sentence-initial is lowercased, **proper nouns and acronyms are also lowercased** (e.g. `NASA → nasa`, `London → london`). If you must preserve them, use the **Capitalize Sentences** tool instead — it only touches the first letter of each sentence and leaves the rest untouched.

## Inputs

- **Text** (textarea): Type or paste text to convert to Sentence case...

## When to use

- When you need to clean up messy, all-caps, or inconsistently capitalized paragraphs for blog posts, articles, or documentation.
- When formatting user-generated content or raw transcripts into readable, standard prose.
- When you want to normalize text styling while ensuring English pronouns like 'I', 'I'm', and 'I'll' remain correctly capitalized.

## How it works

- Paste or type your text into the input area.
- The tool scans the text to identify sentence boundaries marked by periods, exclamation points, or question marks.
- It capitalizes the first letter of each sentence, converts all other characters to lowercase, and restores uppercase formatting to the pronoun 'I' and its contractions.
- Copy the formatted sentence-case text directly from the output.

## Use cases

- Normalizing raw transcripts or dictation outputs that lack proper sentence capitalization.
- Formatting copy-pasted text from legacy systems that output in all-caps or all-lowercase.
- Polishing draft articles, emails, or product descriptions to ensure a clean, professional prose style.

## Frequently asked questions

### How does the tool identify the start of a sentence?

It detects sentence boundaries using ending punctuation marks followed by a space, such as periods, exclamation points, and question marks.

### Will this tool lowercase proper nouns and acronyms?

Yes, because it lowercases all non-sentence-initial letters, proper nouns and acronyms will be lowercased. Use a Capitalize Sentences tool if you need to preserve them.

### Does it handle the English pronoun 'I' correctly?

Yes, the tool automatically detects and capitalizes the standalone pronoun 'I' and its contractions like 'I'm', 'I'll', 'I've', and 'I'd'.

### Can I process multiple paragraphs at once?

Yes, you can paste multi-paragraph text, and the tool will apply sentence case formatting across all paragraphs.

### Does the tool support formatting for languages other than English?

It works for any Latin-based script by capitalizing the first letter after sentence boundaries, but the specific pronoun restoration is tailored for English.

## Related tools

- [Acronym Generator](https://elysiatools.com/en/tools/acronym-generator): Turn a phrase into an acronym or initialism. Choose contributing words, which letter(s) to take, the separator, and the case.
- [Advanced Case Converter](https://elysiatools.com/en/tools/advanced-case-converter): Convert between CamelCase, snake_case, kebab-case, PascalCase, and other naming conventions
- [ASCII Art Generator](https://elysiatools.com/en/tools/ascii-art-generator): Convert text to ASCII art using various fonts and styles
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- [Bold & Italic Text](https://elysiatools.com/en/tools/bold-italic-text): Convert text to bold, italic, or bold-italic using the Mathematical Alphanumeric Symbols Unicode block. Plain Unicode text — no font needed.
- [Fullwidth to Halfwidth Converter](https://elysiatools.com/en/tools/fullwidth-to-halfwidth): Convert fullwidth characters to halfwidth characters for proper text formatting
- [Glitch Text](https://elysiatools.com/en/tools/glitch-text): Create a glitchy / corrupted look by replacing each letter with neighbouring broken Unicode glyphs — Cyrillic/Greek look-alikes, block elements (█▓▒░), geometric shapes — for a flat smashed data-corruption aesthetic. Intensity slider + optional seed for reproducible results.
- [Halfwidth to Fullwidth Converter](https://elysiatools.com/en/tools/halfwidth-to-fullwidth): Convert halfwidth characters to fullwidth characters for CJK text formatting

## Samples

- [Text Case Format Samples](https://elysiatools.com/en/samples/text-case-formats): Examples of different text case formats: camelCase, snake_case, kebab-case, PascalCase, and more
- [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
- [Web Image Processing Python Samples](https://elysiatools.com/en/samples/web-image-processing-python): Web Python image processing examples using PIL/Pillow including reading, saving, resizing, and format conversion
- [Android Image Processing Java Samples](https://elysiatools.com/en/samples/android-image-processing-java): Android Java image processing examples including reading/saving images, scaling, and format conversion