Capitalization Checker
Paste your text below to find capitalization errors — lowercase sentence starts, an uncapitalized "i", and lowercase days, months, and common proper nouns. Fix each one with a click, or fix them all at once.
Honest note: proper-noun detection is limited to a list of about 40 common names (days, months, countries, languages, major companies). It will not catch people's names or less common places — always give your text a final human read.
Frequently Asked Questions
- What does the capitalization checker look for?
- Four rule-based checks: sentences that start with a lowercase letter, the standalone pronoun 'i' written in lowercase, lowercase days of the week and months, and a list of about 40 common proper nouns (countries, languages, nationalities, major companies, and holidays).
- Can it detect every proper noun?
- No. Proper-noun detection is limited to a curated list of common names — it cannot recognize people's names, small towns, or brands outside the list. Treat it as a first pass, not a complete proofread.
- Why are the months May, March, and August not flagged?
- Those three month names are also ordinary English words — 'may' is a verb, 'march' means to walk, and 'august' means distinguished. Flagging them would produce constant false positives, so the tool deliberately skips them.
- How do the one-click fixes work?
- Each finding shows the lowercase text and its capitalized correction. Click Fix to apply that single correction to your text, or Fix All to apply every suggested correction at once. The corrected text stays in the editor so you can keep working.
- Should 'internet' be capitalized?
- It depends on your style guide. AP style lowercased 'internet' in 2016, and most modern guides agree, though some older or formal styles still capitalize it. Because both forms are acceptable, the tool does not flag it.
- Is my text stored or uploaded?
- No. All checks run locally in your browser — your text is never sent to a server.