Sentence Case Converter

Free online sentence case converter. Instantly fix text so each sentence starts with a capital letter and the rest is lowercase — perfect for cleaning up ALL CAPS or messy paste — then copy the result with one click. No uploads, no sign-up, and your text never leaves your device.


    

  

  

    
    
    
  



    

    

      
ToolsSoup’s Sentence Case Converter is a free online tool that rewrites your text in sentence case: it capitalizes the first letter of every sentence and makes the rest lowercase, so “HELLO WORLD. how ARE you?” becomes “Hello world. How are you?”. Paste a paragraph, a heading, or a block typed in ALL CAPS, click the button, and each sentence is fixed automatically. Everything runs in your browser — there are no uploads, no sign-up, and no character limit, and your text never leaves your device.

      

        
What is a sentence case converter?

        
A sentence case converter is a tool that formats text the way you would write a normal sentence: the first letter of each sentence is capitalized and every other letter is lowercase. It detects sentence boundaries after a period, question mark, or exclamation mark and capitalizes the next word, turning “this is one sentence. this is another” into “This is one sentence. This is another”. Unlike a title case converter, which capitalizes the first letter of every word, sentence case capitalizes only the start of each sentence, which is how ordinary prose, captions, and descriptions are written. It is the fastest way to repair text that was typed in caps lock, pasted with random capitalization, or generated all in lowercase.

        
      

      

        
How to convert text to sentence case

        
Fixing the capitalization of your sentences takes just a few seconds:

        
  1. Type directly into the text box or paste the text you want to fix.
  2. Click Convert to sentence case to lowercase everything and capitalize the first letter of each sentence.
  3. Review the result in the output box on the right.
  4. Click Copy result to copy the sentence case text to your clipboard.

      

      

        
When should you use sentence case?

        
Sentence case is the natural style for body text: paragraphs, product descriptions, image captions, form labels, UI buttons, email and chat messages, and increasingly for headlines and subheadings in modern web design. It is easier to read than ALL CAPS and feels less formal and more conversational than title case. Reach for this converter whenever you receive text that was shouted in capitals, pasted with inconsistent casing, or written entirely in lowercase, and you want it to read like clean, normal writing without retyping every sentence.

        
      

      

        
Why use this sentence case converter?

        
  • Capitalizes the first letter of each sentence and lowercases the rest in one click.
  • Fixes ALL CAPS, all-lowercase, and randomly mixed-case text instantly.
  • Detects sentence breaks after periods, question marks, and exclamation marks.
  • Keeps numbers, punctuation, spacing, and line breaks unchanged.
  • No character limit and an instant one-click copy.
  • Runs entirely in your browser — your text is never uploaded or stored.

      

      

        
Frequently asked questions

        

          
How do I convert text to sentence case?

          
Paste your text into the box and click Convert to sentence case. The tool lowercases the whole text, then capitalizes the first letter of each sentence, and the result appears in the output box ready to copy with one click.

        

        

          
What is sentence case?

          
Sentence case is the standard capitalization for ordinary writing: only the first letter of each sentence is capital and the rest of the words are lowercase, such as “This is a sentence. And here is another.” It is how paragraphs and descriptions are normally written.

        

        

          
How is sentence case different from title case?

          
Title case capitalizes the first letter of every word (Like This Heading), while sentence case capitalizes only the first letter of each sentence (Like this heading). Sentence case is used for body text and casual headings; title case is used for formal titles.

        

        

          
Does it capitalize after every period?

          
It capitalizes the first letter that follows a period, question mark, or exclamation mark plus a space, which marks the start of a new sentence. It does not change the casing of names or abbreviations, so you may want to review proper nouns afterward.

        

        

          
Can I convert a large block of text at once?

          
Yes. There is no character limit, so you can fix a single line or an entire document of paragraphs in one click.

        

        

          
Is my text private?

          
Absolutely. All conversion happens locally in your browser using JavaScript, so the text you enter is never sent to or stored on any server.