Sentence Case Converter
An easy-to-use title capitalization tool. Convert your standard text into title text with this online sentence case converter.
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Sentence Case Converter
The Sentence Case Converter takes your text and formats it so the first letter of every sentence is capitalised and every other letter is lowercase. It handles any amount of text, from a single line to a full document, and delivers the result instantly in your browser.
Paste your text into the box above, click the button, and copy the output. You can convert to sentence case in one click without creating an account, installing software, or waiting for a page to reload.
Writers use it to clean up drafts pasted from all-caps sources. Students use it to format APA reference lists where sentence case is required. Professionals use it to fix documents that were typed with caps lock accidentally switched on. Every conversion stays on your device and is never sent to a server.
What Is Sentence Case?
Sentence case is a capitalisation style where only the first letter of the first word in a sentence is capitalised, along with any proper nouns, while every other letter remains lowercase.
That definition covers two rules working together. The first rule is positional: the opening word of each sentence gets a capital regardless of what word it is. The second rule is categorical: proper nouns, meaning names of specific people, places, organisations, and brands, keep their capitals wherever they appear in the sentence.
Example: “sarah works at google in new york.” becomes “Sarah works at Google in New York.”
The word “sarah” gets capitalised because it opens the sentence. “Google” and “New York” keep their capitals because they are proper nouns, not because of where they sit in the sentence. This is what separates sentence case from lowercase conversion, which removes every capital without exception.
How to Use the Sentence Case Converter
Converting your text takes four steps.
- Paste your text into the input box above. You can type directly or paste content copied from any source: a Word document, a Google Doc, an email, a spreadsheet, or a note-taking app. The tool has no character limit and handles any volume of text.
- Click the Convert to Sentence Case button. The conversion runs instantly. You do not need to wait, refresh the page, or confirm a second time.
- Review the output. You may notice that some words remain capitalised after conversion. This is correct behaviour, not an error. Names of people, places, brands, and organisations keep their capitals because sentence case preserves proper nouns. The tool does not strip capitals from words that are meant to be capitalised.
- Copy or download your result. Click Copy to add the converted text to your clipboard, or click Download to save the output as a .txt file for offline use or sharing.
Sentence Case Rules
Sentence case follows five rules. Understanding all five prevents errors when the output looks different from what you expected.
The first word rule.
Every sentence starts with a capital letter on its first word, regardless of what part of speech that word is. Articles, prepositions, and conjunctions all get a capital when they open a sentence.
Example: “and then she left.” becomes “And then she left.”
The proper noun rule.
Names of specific people, places, companies, products, languages, and nationalities keep their capitals wherever they appear in the sentence. This is the rule that most users are surprised by when they see it in action.
Example: “he visited paris and met marie.” becomes “He visited Paris and met Marie.”
The pronoun rule.
The pronoun “I” is always written in uppercase in English, in every position.
Example: “yesterday i finished the report.” becomes “Yesterday I finished the report.”
The acronym rule.
Abbreviations and initialisms that are conventionally written in capitals keep those capitals in sentence case. HTML, NASA, PDF, and similar abbreviations are not lowercased.
Example: “send the file as a pdf.” becomes “Send the file as a PDF.”
The colon rule.
Whether to capitalise the first word after a colon depends on the style guide you follow. AP style capitalises it when the clause after the colon is a complete sentence. APA style does not capitalise after a colon in most cases. If you are unsure, check the style guide your publication or institution requires.
Sentence Case vs Title Case
Sentence case and title case are the two main capitalisation styles used for headings, titles, and headlines. They look similar at a glance but follow completely different rules, and the choice between them depends on your context and style guide.
In sentence case, only the first word and proper nouns get capitals. In title case, every major word gets a capital and only short articles, prepositions, and conjunctions stay lowercase. The difference becomes obvious in longer headings.
Sentence case: “The role of content in search engine optimisation”
Title case: “The Role of Content in Search Engine Optimisation”
| Difference | Sentence Case | Title Case |
|---|---|---|
| Capitalisation rule | First word and proper nouns only | All major words capitalised |
| Typical use | Blog headings, APA citations, email subject lines | Book titles, formal documents, newspaper headlines |
| Style guides that prefer it | APA (reference lists), AP style (headlines) | MLA, Chicago, most academic publishers |
| Visual weight | Lighter and more readable in long lists | Higher visual weight, stronger emphasis |
| Ambiguity with proper nouns | Easier to identify proper nouns at a glance | Harder to distinguish proper nouns from regular words |
Neither style is universally correct. Choose based on the style guide your context requires. For blog subheadings and APA reference lists, sentence case is the standard. For academic paper titles in MLA or Chicago format, title case is the requirement.
If you need title case conversion, the Case Converter handles both formats from the same tool.
When to Use Sentence Case
Sentence case is not a universal default. It belongs in specific contexts, and knowing those contexts helps you choose the right format before you convert.
APA reference lists.
APA 7th edition requires sentence case for the titles of articles, books, chapters, and web pages listed in your references section. Even when the original source uses title case on its cover or webpage, you must rewrite it in sentence case in your APA citation. This is one of the most common reasons students and researchers reach for a sentence case converter.
Blog post and article subheadings.
Many modern editorial publications, including major technology and business blogs, use sentence case for H2 and H3 subheadings. It reads as natural prose rather than a formal label and matches the conversational tone that digital audiences expect.
Email subject lines.
Sentence case feels less formal and less aggressive than title case in email. Marketing research consistently shows that sentence case subject lines perform well in conversational email campaigns because they look like something a person typed rather than a branded headline.
Social media captions.
On platforms where all-caps and heavy capitalisation read as shouting or spam, sentence case matches the natural tone of the platform and makes copy easier to read quickly.
User interface copy and design systems.
Interface text, button labels, form field names, navigation items, and error messages follow sentence case in most major design systems. Google Material Design, Apple Human Interface Guidelines, and Microsoft Fluent Design all specify sentence case for UI components. Designers and developers working on product copy use sentence case conversion to standardise text across a product before handoff.
Why Use This Sentence Case Converter
No character limit.
The tool processes any amount of text you put into it. Paste a single sentence, a paragraph, or an entire document. The conversion speed does not change with volume, and the output appears the instant you click the button.
Your text stays completely private.
Every conversion runs in your browser using client-side JavaScript. Your text is never transmitted to a server, never logged, and never stored anywhere. You can convert sensitive documents, private correspondence, and confidential copy without any concern about where your content goes.
Proper nouns stay correctly capitalised.
Unlike a basic find-and-replace script, the tool applies sentence case formatting while preserving the capitalisation of names, brands, places, and acronyms. The output is usable immediately without a manual review for proper noun errors.
Copy or download with one click.
Grab the converted text with the Copy button, or save it as a .txt file using Download. The download option is useful for large documents you want to archive or share.
Works on every device without installation.
The converter runs in any modern browser on any device. No app, no account, no update required. If you also need to strip formatting from your source text before converting, the Remove Text Formatting tool clears fonts, colours, and styling from pasted content in one step.
Related Text Tools
These tools cover the tasks that come before and after sentence case conversion:
- Case Converter converts text between all seven case formats including uppercase, lowercase, title case, and alternating case from a single page
- Paragraph to Single Line Converter collapses multi-line text into a single continuous line before you format it
- Remove Text Formatting strips fonts, colours, bold, and italic styling from pasted text so you start with clean plain text
- Small Text Generator converts text into Unicode small caps and superscript characters for social media and stylised copy
- Lorem Ipsum Generator generates placeholder text in multiple paragraph lengths for wireframes and design layouts
Frequently Asked Questions
What does a sentence case converter do?
A sentence case converter takes any block of text and reformats the capitalisation so the first letter of every sentence is uppercase and every other letter is lowercase, with proper nouns kept correctly capitalised throughout. You paste your text, click one button, and copy the formatted result.
Does the sentence case converter keep proper nouns capitalised?
Yes. The tool recognises that names of people, places, companies, and brands require capitalisation regardless of their position in a sentence. If you convert “he works at microsoft in seattle,” the output is “He works at Microsoft in Seattle,” not “He works at microsoft in seattle.”
What is the difference between sentence case and title case?
Sentence case capitalises only the first word of each sentence and proper nouns. Title case capitalises the first letter of every major word, leaving only short articles, prepositions, and conjunctions in lowercase. Sentence case looks more like natural prose. Title case carries more visual weight and is used in formal publications.
Which style guides require sentence case?
APA style requires sentence case for article and book titles in reference lists. AP style uses sentence case for newspaper and news article headlines. Google Material Design and Apple Human Interface Guidelines both specify sentence case for interface copy and UI labels. Many digital publications also use sentence case for blog subheadings.
Is this sentence case tool free to use?
Yes. The tool is completely free with no subscription, no account, and no usage limit. You can convert as much text as you need across as many sessions as you want, at no cost.