Default Unicode uppercase
Cased characters are converted with JavaScript's default Unicode case mapping. The UI language does not change the conversion rule.
038 · TEXT
Case & Sentence Format Converter
Convert text to uppercase, lowercase, simple title case, sentence case, or first-letter uppercase while preserving its original structure.
LOCALOriginal and converted text are processed locally in your browser and are not sent to or stored on a server.
LOCALText you type or load and the converted result stay in this browser and are not sent to or stored on a server.
Type, paste, or drop a text file
You can also drop a TXT, MD, or CSV file anywhere in this workspace.
Choose a conversion format, then generate the result.0 characters · .txt · .md · .csv
Local processing · No server upload
HOW TO USE
How to use
- 01
Type or paste text, or choose/drop a TXT, MD, or CSV file.
- 02
Choose Uppercase, Lowercase, Title Case, Sentence case, or First letter uppercase.
- 03
Run the converter and review the result and changed-character summary calculated from the original text.
- 04
Edit the result if needed, then copy it or download it as a UTF-8 TXT file.
- 05
Use Clear all to reset the file, original text, result, and conversion format for a new task.
FORMAT GUIDE
Case and sentence-format conversion guide
These notes explain uppercase, lowercase, simple title case, sentence case, first-letter capitalization, and how the tool preserves whitespace structure.Default Unicode lowercase
Cased characters are converted with default Unicode lowercase mapping. Characters without case, such as Korean or Japanese, stay unchanged.
Capitalize word starts
The first cased character of each word and after hyphens or apostrophes is uppercased, while remaining cased characters are lowercased. It is not an AP, APA, or Chicago style engine.
Capitalize sentence starts
The text is lowercased first, then the first cased character at the start, after line breaks, and after . ! ? 。 ！ ？ is uppercased.
Change the first cased character only
Only the first cased character in the original string is uppercased. The rest of the original character state and structure are preserved.
Keep whitespace and separators
Tool 038 changes casing only. Spaces, tabs, NBSP, full-width spaces, line breaks, emoji, and ZWJ sequences are not normalized or removed.
IMPORTANT NOTES
Important notes
- Title Case is not an AP, APA, Chicago, or MLA publishing-style engine.
- Sentence case does not restore proper nouns or acronyms such as NASA or iPhone and may produce Nasa.
- Spaces, line breaks, tabs, NBSP, full-width spaces, emoji, and ZWJ sequences are not changed for non-casing purposes.
- Characters without case, including most Korean and Japanese text, correctly remain unchanged.
- TXT, MD, and CSV file input is read and processed locally in the browser.
FAQ
Frequently asked questions
01Is my text or uploaded file sent to a server?+
No. Typed text, TXT/MD/CSV files, and the converted result are processed locally in your browser.
02Does Title Case follow publishing style guides?+
No. It uses a simple, predictable first-cased-character-per-word rule.
03Will sentence case preserve NASA?+
Not necessarily. Because it lowercases first and then capitalizes sentence starts, NASA may become Nasa.
04Does it also clean whitespace?+
No. Tool 038 changes casing only and does not rewrite spaces, tabs, or line breaks.
05Can I edit and save the converted result?+
Yes. You can edit the result, then copy it or download it as a UTF-8 TXT file.