Sentence Capitalizer
Fix capital letters in any text – sentence starts, “I”, caps-lock shouting and lowercase notes – while keeping acronyms, names, links and emails exactly right.
- Smart sentence detection
- Sentence and title case
- Highlights every change
- Runs in your browser
Processed in your browser – your text is never uploaded.
How to fix capitalisation
- Paste your textPaste text with messy capitals – typed in caps lock, all lowercase, or a mix. Press Sample to see what it fixes.
- Choose sentence or title caseSentence case capitalises the start of each sentence; Title Case is for headings. Adjust options such as keeping acronyms or adding your own names.
- Copy the resultTick “Highlight changes” to see exactly which letters changed, then copy or download the corrected text.
Capitalisation rules at a glance
| Capitalise | Example |
|---|---|
| The first word of every sentence | The meeting starts at ten. Please be on time. |
| The pronoun “I” | Yesterday I called, and I’m calling again. |
| Names of people, places and organisations | Priya moved to Pune to join Infosys. |
| Days, months and festivals | See you on Friday, 3 November, before Diwali. |
| Acronyms and initialisms | Pay by UPI and download the PDF. |
Don’t capitalise seasons (summer), directions (north) or common nouns (the government) unless they start a sentence or are part of a name.
Frequently asked questions
What is sentence case?
Only the first letter of each sentence – plus names, places and the word “I” – is a capital. It’s the standard style for normal writing, emails and most headings on modern websites.
Will it lowercase acronyms like PDF or UPI?
No. Short words in capitals, like PDF, UPI, GST or NASA, are kept as they are. If a whole line was typed in caps lock, common acronyms are still kept but other capitals are lowered.
Does it know where sentences end?
Yes. It starts a new sentence after a full stop, question mark or exclamation mark – but not after abbreviations like Mr., Dr., e.g. or i.e., initials like J. K., or decimal numbers like 3.5.
How do I keep names capitalised?
Common names such as days, months, India, Google or iPhone are built in. Add your own – people, companies or products – in “Always write these as”, separated by commas, and they’ll be spelled exactly that way.
Are links and email addresses changed?
No. Web addresses, email addresses, @mentions, #hashtags and text in `backticks` are left exactly as you typed them.
What’s the difference between title case and capitalising every word?
Title case keeps short words like “and”, “of” and “the” lowercase unless they’re the first or last word, as most style guides recommend: “The Lord of the Rings”. To capitalise every word, use our Case Converter.
Is my text uploaded?
No. Everything happens in your browser.
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