Capitalize Sentences

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.