Capitalization Checker
Find possible capitalization errors at sentence starts, in the pronoun I, and in English days and months.
Open toolProofreading tool
Punctuation Checker - Private and No AI
Scan a draft for common punctuation patterns without sending it to an AI service. Each result points to a line and explains what to review.
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What this tool checks
A focused signal for your next edit.
Punctuation errors often survive ordinary rereading because the reader already knows the intended rhythm. A mechanical scan makes inconsistent spacing, duplicate marks, and unfinished sentences easier to see.
01
Spacing around punctuation
02
Repeated marks and unmatched quotes
03
Paragraph-ending checks
Practical uses
Use the result as a review list.
- Run a final punctuation check on an essay or research summary.
- Review text copied from notes, PDFs, or speech-to-text software.
- Find common formatting mistakes before a class discussion post.
Questions
Before you use the result.
What punctuation problems can this checker find?
It checks repeated punctuation, spacing before and after marks, repeated spaces, unmatched straight quotation marks, and paragraphs without closing punctuation.
Is my text used to train AI?
No. The check runs in your browser. Your text is not uploaded, stored, or included in analytics events.
Will it correct every comma error?
No. Comma choices often depend on sentence structure and meaning. The tool focuses on detectable mechanical patterns rather than claiming a complete grammar review.
Need AI detection too?
Check text, images, and audio in the mobile app.
Use these free browser tools for mechanical review, then use Stealth AI Detector when you need AI and human probability signals.
