How to Convert Text Between Uppercase, Lowercase, Title Case, and Sentence Case
September 4, 2026
Written by Mohammad Sohail
Wrong text case looks unprofessional. ALL CAPS FEELS LIKE SHOUTING. all lowercase looks lazy. Proper capitalization matters in resumes, emails, titles, and formal documents. A case converter fixes this instantly.
The Four Common Cases: UPPERCASE: ALL LETTERS ARE CAPITALIZED. Use for headings, acronyms, and emphasis. lowercase: all letters are lowercase. Use for certain design styles and code. Title Case: First Letter Of Each Major Word Is Capitalized. Use for titles, headings, and subtitles. Sentence case: First letter of each sentence is capitalized. Use for body text and paragraphs.
What I Tested: I used the [Case Converter](/text-tools/case-converter) with the text: 'the quick brown FOX jumps over the lazy DOG'
• Uppercase: 'THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG' — Correct.
• Lowercase: 'the quick brown fox jumps over the lazy dog' — Correct.
• Title Case: 'The Quick Brown Fox Jumps Over the Lazy Dog' — Correct. Minor words (the, over) were lowercase, which follows standard title case rules.
• Sentence case: 'The quick brown fox jumps over the lazy dog' — Correct. Only the first letter capitalized.
Step-by-Step: (1) Open the [Case Converter](/text-tools/case-converter). (2) Paste your text into the input area. (3) Click the case button you want (UPPER, lower, Title, Sentence). (4) The converted text appears instantly. (5) Click 'Copy' to copy the result.
One Limitation: Title case rules vary by style guide. AP Style capitalizes words with 4+ letters. Chicago Manual of Style capitalizes all words except articles, short prepositions, and conjunctions. Our converter follows a general rule: capitalize all words except 'a', 'an', 'the', 'and', 'but', 'or', 'for', 'nor', 'on', 'at', 'to', 'from', 'by'.
Common Mistake: Converting text to uppercase for entire paragraphs. All-caps text is harder to read because we recognize word shapes, and uppercase letters are all the same height. Use uppercase sparingly — for headings and labels, not body text.
Privacy: Your text is processed entirely in your browser. It is never sent to any server.
Next Step: After fixing case, use the [Word Counter](/text-tools/word-counter) to check if your text meets length requirements.