# Capitalize Sentences

Capitalize only the first letter of each sentence while preserving all other letters exactly as typed. Fixes sentence starts without disturbing acronyms, proper nouns, or intentional mixed-case.

> Canonical page: https://elysiatools.com/en/tools/capitalize-sentences

- **Category:** Text Processing

- **Keywords:** capitalize sentences, capitalize first letter, sentence start capital, fix sentence case, preserve case

## Overview

Capitalize only the **first letter of each sentence** — and leave everything else exactly as you typed it.

This is the surgical counterpart to the Sentence Case Converter:

| Tool | First letter of each sentence | Other letters |
|------|-------------------------------|---------------|
| **Capitalize Sentences** (this) | capitalized | **preserved as-is** |
| Sentence Case Converter | capitalized | lowercased |

**How it works:**
- Sentences are detected by their ending punctuation: `. ` `! ` `? `.
- The first alphabetic character after each sentence boundary is uppercased (if it is a letter that has an uppercase form).
- **No other character is changed** — existing capitals, acronyms, proper nouns, and mixed-case formatting all survive untouched.

**When to use which:**
- Use this tool when your text already has the capitals you want (e.g. acronyms like `NASA`, product names like `iPhone`) and you only need to fix the start of each sentence.
- Use the Sentence Case Converter when you want a uniform, all-lowercase-except-sentence-starts look — but be aware it will also lowercase your acronyms and proper nouns.

**Good to know:**
- If a sentence already starts with a capital, nothing changes — the tool is idempotent.
- Numbers and symbols at the start of a sentence are skipped; the first actual letter is capitalized.

## Inputs

- **Text** (textarea): Type or paste text — only the first letter of each sentence will be capitalized...

## When to use

- When you have raw or unformatted text with lowercase sentence starts but want to keep acronyms like NASA or API in uppercase.
- When editing draft articles, emails, or documentation where product names like iPhone or eBay must retain their specific mixed-case formatting.
- When you need to quickly clean up transcribed speech or notes without manually fixing the beginning of every sentence.

## How it works

- Paste or type your text into the input area.
- The tool scans the text to detect sentence boundaries using ending punctuation marks like periods, exclamation points, and question marks.
- It capitalizes the first alphabetic character following each boundary while leaving all other characters completely untouched.

## Use cases

- Cleaning up voice-to-text transcriptions that missed sentence-start capitalization.
- Formatting technical documentation containing code terms, APIs, and brand names that must not be lowercased.
- Polishing quick notes and draft emails before sending them to clients or colleagues.

## Frequently asked questions

### How does this tool differ from a standard sentence case converter?

Standard converters lowercase everything except the first letter of a sentence. This tool only capitalizes the first letter and leaves all other letters exactly as you typed them.

### Will it lowercase my acronyms or proper nouns?

No, all existing uppercase letters, acronyms, and mixed-case words are preserved.

### What punctuation marks trigger a new sentence?

The tool detects sentence boundaries using periods, exclamation marks, and question marks followed by a space.

### What happens if a sentence starts with a number or symbol?

The tool skips the numbers or symbols and capitalizes the first actual letter that follows them.

### Is my text sent to a server?

No, all text processing is performed locally in your browser for complete privacy.

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