BYTETOOLS

Capitalize Sentences

Capitalize the first letter of every sentence online. Split on periods, question and exclamation marks, and optionally lowercase the rest for clean sentence case.

What is the Capitalize Sentences?

Capitalize Sentences fixes the opening letter of every sentence so your text follows proper sentence case.

  • Capitalises the first letter after . ! and ?
  • Also capitalises the very first sentence
  • Optional lowercasing of the rest for full sentence case
  • Leaves acronyms alone unless you lowercase
  • Live preview as you type
  • 100% in-browser — nothing is uploaded

How to use the Capitalize Sentences

  1. 1

    Paste your text into the input box.

  2. 2

    The first letter of each sentence is capitalised automatically.

  3. 3

    Optionally enable lowercasing the rest of each sentence.

  4. 4

    Copy the corrected text or download it as a file.

About the Capitalize Sentences

Capitalize Sentences fixes the opening letter of every sentence so your text follows proper sentence case. It finds sentence boundaries at periods, question marks, and exclamation points and capitalises the first letter that follows.

By default the rest of each sentence is left untouched, so acronyms and proper nouns keep their capitalisation. An optional mode lowercases the remainder first, which is perfect for cleaning up text that arrived in ALL CAPS or with random casing.

All processing is done in your browser with JavaScript — your text is never uploaded. It's a fast, private way to tidy the capitalisation of drafts, captions, and imported content.

Frequently asked questions

How do I capitalize the first letter of each sentence?

Paste your text and the tool detects sentence endings at periods, question marks, and exclamation points, then capitalises the first letter of the next sentence automatically.

Will it lowercase the rest of my sentences?

Only if you enable that option. By default the tool just fixes the opening letter and leaves everything else as-is, preserving acronyms and proper nouns.

What is sentence case?

Sentence case capitalises only the first letter of each sentence (and proper nouns), unlike title case where most words are capitalised. This tool produces sentence case.

How do I fix text that is in all caps?

Enable the lowercase-the-rest option. The tool lowercases the text first, then capitalises the start of each sentence, turning ALL CAPS into readable sentence case.

Is my text uploaded when capitalizing sentences?

No. All capitalisation happens locally in your browser, so your text never leaves your device.

Guides for Capitalize Sentences

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