What counts as the start of a sentence?

The first character of the text and any character following a period, exclamation mark, or question mark followed by a space.

Will it capitalize proper nouns?

The tool only capitalizes sentence-starting letters. It won't detect and capitalize proper nouns mid-sentence.

How is sentence case different from title case?

Sentence case capitalizes only the first word of each sentence. Title case capitalizes the first letter of most words in a heading.

Sentence Case Converter

Convert text to sentence case — capitalize first letter of each sentence.

By Mike Starr·Last reviewed: August 2026

About Sentence Case Converter

The Sentence Case Converter formats your text so the first letter of each sentence is capitalized and the rest are lowercase. This is the standard writing format for most prose, making it ideal for fixing copied text, normalizing user input, or correcting ALL-CAPS or aLL-oVeR-tHe-pLaCe text.

How to Use This Tool

1Paste or type your text into the input area.
2Click 'Convert to Sentence Case'.
3The result appears in the output area.
4Copy the result with one click.

Benefits of This Tool

Automatically capitalizes the start of every sentence

Fixes ALL-CAPS and random-case text instantly

Standard format for prose and general writing

Handles multi-sentence and multi-paragraph text

Frequently Asked Questions

Glossary

Sentence Case

A capitalization style where only the first word of a sentence and proper nouns are capitalized.

Title Case

A capitalization style where major words in a heading are capitalized.

Grammar

The system of rules governing the structure and use of a language.

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Title Case Converter

Convert text to proper Title Case for headlines and headings.