Sentence Case Converter – Complete Guide & Free Online Tool

A sentence case converter capitalizes only the first letter of each sentence while leaving the rest lowercase, which is the standard for body text. Free online tool included.

Published 2026-09-13

In this guide
  1. What is Sentence Case Converter?
  2. What is sentence case?
  3. Sentence case vs title case
  4. Key Features
  5. Examples
  6. Common Use Cases
  7. Tips & Best Practices
  8. Limitations
  9. Related Tools
  10. External Resources

What is Sentence Case Converter?

A sentence case converter capitalizes only the first letter of each sentence while leaving the rest lowercase, which is the standard for body text.

What is sentence case?

Sentence case means only the first word of each sentence (and proper nouns) is capitalized. This is the standard for paragraphs and most web content.

Sentence case vs title case

Sentence case is used for body text; title case is used for headings and titles. Converting between them helps keep your content consistent.

Key Features

• Capitalizes sentence starts • Lowercases the rest • Instant conversion

Examples

• THIS IS THE FIRST SENTENCE. AND THIS IS THE SECOND ONE. becomes This is the first sentence. And this is the second one.

Common Use Cases

• Formatting body text • Fixing all-caps content • Standardizing copy

Tips & Best Practices

• Keep proper nouns capitalized manually • as automation cannot detect them reliably.

Limitations

• Does not reliably preserve proper nouns.

Related Tools

Explore other text tools: [Text Tools](/categories/text).

Related tools: [title-case-converter](/tools/title-case-converter), [case-converter](/tools/case-converter), [uppercase-converter](/tools/uppercase-converter).

External Resources

Microsoft: Sentence case

Related Tools

Title Case Converter Convert text to title case for headings, with smart handling of small words. Text Use Tool →
Case Converter Switch text between uppercase, lowercase, title case, sentence case and more. Text Use Tool →
Uppercase Converter Convert any text to all uppercase (capital) letters instantly. Text Use Tool →

Frequently Asked Questions

What is sentence case?
Only the first letter of each sentence is capitalized, and the rest is lowercase.
Will it keep proper nouns capitalized?
No, automation cannot reliably detect proper nouns, so check them manually.
Is it free?
Yes, and it runs locally in your browser.

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