How this tool works
The offline check looks for five mechanical patterns: repeated spaces, a word accidentally typed twice in a row, a space before punctuation, a missing space after punctuation, and a lowercase first letter. Each one it finds is listed and corrected. What it does not check is grammar — agreement, tense, article use, word choice and sentence structure are all untouched, and the result says so.
That distinction matters, because a report saying "no issues found" from a five-pattern checker is not a verdict on your grammar. Add a free AI key and a language model proofreads properly: it returns the corrected text in full, then lists what it changed and why, so you can accept or reject each correction rather than trusting a black box.
Using the corrections well
- Read the explanations: with a key, each correction comes with a reason. That is the part that stops you making the same mistake again.
- Keep your voice: the model is told to correct errors, not to rewrite for style. If it changed something that was not wrong, keep your version.
- Watch deliberate fragments: sentence fragments used for effect can be flagged as errors. Ignore those corrections.
- Paste a paragraph at a time: for long documents, proofreading in sections gives more careful attention to each than one large block.