Basic Case Tool
Sentence Case Converter
Capitalize the first letter of each sentence automatically.
Features
Sentence Boundary Detection
Detects periods, exclamation marks, and question marks to locate sentence starts accurately.
Handles Multi-line Text
Processes each paragraph independently — line breaks are respected.
From ANY Case
Works regardless of input casing — ALL CAPS, tItLe CaSe, or random case all normalize correctly.
Preserves Acronyms
Numbers and non-letter characters following punctuation are handled gracefully.
How to Use
- 1
Paste your text
Paste any text with inconsistent capitalization into the input area.
- 2
View sentence case output
The output panel shows properly capitalized sentences in real time.
- 3
Copy and use
Copy the output to clipboard or download it as a text file.
Examples
Multiple sentences
Input
hello world. this is a test. it works great!Output
Hello world. This is a test. It works great!From ALL CAPS
Input
THE SUN RISES. IT SETS AGAIN. LIFE GOES ON.Output
The sun rises. It sets again. Life goes on.With exclamations
Input
amazing! what a tool! try it now.Output
Amazing! What a tool! Try it now.Common Questions
Sentence case capitalizes the first word of each sentence and keeps all other words in lowercase, unless they are proper nouns. It mirrors how standard English prose is written.
The converter identifies sentence-ending punctuation (., !, ?) followed by whitespace and capitalizes the next alphabetic character.
Basic abbreviations may trigger false sentence boundaries since the detector looks for periods. For complex documents, review the output for any such edge cases.