Lowercases your text, then capitalizes the first letter of each sentence. Fast, free, and built for simple browser-based workflows.
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Sentence Case Converter is a free online tool that lowercases your text and then capitalizes the first letter of each sentence. Paste a paragraph typed in ALL CAPS or with inconsistent capitalization, click Convert Text, and get back readable sentences in one pass.
It's useful for fixing a paragraph that was typed with Caps Lock on, cleaning up text copied from a PDF that lost its original capitalization, normalizing a block pasted from a spreadsheet cell, or turning a note you typed quickly and carelessly into something you can paste into an email without embarrassment. Doing this by hand means re-checking every period; converting the whole block does it in one pass.
Everything runs inside your browser, so nothing you paste is sent to a server or stored anywhere. That matters if the text belongs to an unpublished draft, an internal note, or client copy under an NDA -- content you would rather not upload to a site you do not control. The result stays on your device unless you choose to copy or download it.
Drop a paragraph, note, or draft into the Input box.
The whole block lowercases first, then the start of each sentence capitalizes.
The sentence-case version appears in the Result box below, ready to use.
Use Copy for the clipboard or Download to save it as a .txt file. Clear resets both boxes.
Yes! All our tools are 100% free to use with no hidden costs, no registration required, and no credit card needed.
Absolutely. All tools run entirely in your browser (client-side). Your data never leaves your device and is not sent to our servers.
Yes, once the page is loaded, the tool will continue to work even if you lose internet connection since it runs in your browser.
There is no strict character limit, but very large amounts of text (100,000+ characters) may slow down your browser.
Yes! All our tools are free for both personal and commercial use.
It lowercases everything first, then only capitalizes the start of each sentence -- so a name like "John" or an acronym like "NASA" becomes "john" or "nasa" unless it happens to start a sentence. Always review the result for names, brand terms, and acronyms before publishing.
Only when "I" starts a sentence. Because the tool detects sentence breaks by punctuation rather than by grammar, a standalone "i" in the middle of a sentence stays lowercase and needs a manual fix -- a known limitation of any punctuation-based sentence case converter.
Sometimes. The tool treats any period followed by a space and a letter as a sentence end, so an abbreviation like "e.g." can trigger an unwanted capital on the word right after it. This is uncommon enough not to matter for most text, but worth a quick scan if your draft uses a lot of abbreviations.
Yes -- that's one of the most common uses. The tool lowercases the whole block first regardless of how it started, so ALL CAPS, Mixed Case, and lowercase text all end up in the same clean sentence-case format after conversion.
A period, question mark, or exclamation point followed by whitespace and another letter. Multiple line breaks, quotation marks right after punctuation, or unusual spacing can occasionally throw off detection, so it's worth a quick read-through of longer documents after converting.
Sentence case only capitalizes the first word of each sentence, matching how normal prose is written. Title case capitalizes every word, which suits headlines and headings instead of paragraphs. Use the Title Case Converter if you're formatting a heading rather than body text.