Punctuation Checker
Fix commas, periods, and punctuation instantly
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Do you know a comma belongs somewhere in that sentence but not where? Have you ever stared at a semicolon and swapped it for a full stop just to be safe? Punctuation Checker reads your text and fixes the marks, then tells you what it changed so the next draft needs less fixing.
Short answer: Punctuation Checker is a free AI tool on EizTools that corrects commas, apostrophes, quotation marks and end punctuation in your writing, and can show each change so you learn the rule behind it.
What is Punctuation Checker?
It is a proofreading tool aimed at one layer of writing. Not grammar, not word choice, not structure. Punctuation, from the comma splice in a long sentence to the apostrophe in a plural that does not need one. You paste text in and get it back corrected, annotated or listed as changes, depending on how you set the output.
Why Use Punctuation Checker?
Because punctuation errors are the ones readers notice and writers stop seeing. After three passes over your own paragraph, your eye supplies the pause your keyboard never typed. A second reader fixes that instantly, and this is a second reader that is available at eleven at night before a deadline.
How Does Punctuation Checker Work?
Paste your text into the prompt box, which asks for the text you want checked and improved. Set an engine, then expand the accordion to choose scope and style before generating.
The corrected version appears in an output card, and Open result gives you a full width view for comparing against your original. Move it back into your document, or take the Word, TXT or HTML export. The activity history panel keeps the session's runs, so a clean copy and an annotated copy of the same paragraph can sit together while you work through the changes.
Scope, Style And Strictness
| Option | What it controls | Where to start |
|---|---|---|
| Punctuation Scope | Which marks are checked | All Marks, then narrow to Commas if that is your weakness |
| Punctuation Style | The convention followed | Academic for papers, Journalistic for news style copy |
| Output Style | What you get back | Annotated while you are learning, Copy-Ready when you are not |
| Correction Strictness | How firmly rules are applied | Around 5 of 10, higher for formal writing |
A Sentence Focus dropdown targets the sentence level problems that cause most comma errors in the first place:
- Run-ons and comma splices, where two sentences have been joined loosely
- Fragments, where a clause has been left standing on its own
- Sentence length and flow, for paragraphs that read breathlessly
- Parallelism, where a list changes grammatical shape halfway through
Four toggles cover Fix Punctuation, Preserve Meaning, Preserve Style and Highlight Changes. Keep Preserve Style on if you write deliberately short sentences, or the tool may join them.
Learn from Annotated mode Set Output Style to Annotated for the first few runs. Seeing why a comma moved teaches the pattern, and after a week you will be writing the correction yourself.
Common Mistakes
The comma splice
Two full sentences joined by a comma. The most common error in careful writing, and the easiest to miss aloud.
Quotation placement
Whether the full stop sits inside or outside the quote marks depends on the style you follow, so set it deliberately.
Apostrophes in plurals
Decades and abbreviations rarely need one. The Highlight Changes toggle makes these easy to spot in a long document.
EizTools is free with no account, and every tool is its own workspace with settings built for that job and a model selector you set per run. When a passage needs more than punctuation and has to be rebuilt, the Content Rewriter handles that, and the writing tools category lists the rest of the editing set.
Frequently Asked Questions
Does it follow British or American punctuation?
Both are available. The Punctuation Style dropdown carries British and American values alongside Formal, Modern, Minimal and Academic, so pick the one your publication or your institution uses before generating.
Will it change my writing style?
Not if you keep Preserve Style switched on. That setting tells the tool to correct marks without rebuilding your sentences, which matters if short sentences are a deliberate choice.
Can it handle dialogue?
Yes. Set Punctuation Scope to Dialogue and the check focuses on speech marks, dialogue tags and the punctuation inside quoted lines, which is where fiction drafts most often go wrong.
How long a text can I check?
Work in sections rather than pasting a whole manuscript. A few paragraphs at a time gives more careful correction, and the session history keeps each checked section for you.
Punctuation is invisible when it works and distracting when it does not. Getting it right is mostly a matter of a second pass by someone who has not been staring at the sentence for an hour.
Paste a paragraph into Punctuation Checker, set Output Style to Annotated, and read what it changed before you accept it.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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