10 Best Free AI Punctuation Checkers in 2026

When writing, you might catch a lot of mistakes on your own, but punctuation errors still slip through. A missing comma here, an extra period there, and suddenly a sentence reads differently than intended.

AI punctuation checkers help clean up those tricky spots, fix small errors fast, and make your writing easier to read. They highlight issues you might overlook and offer quick suggestions to improve clarity and flow.

In this article, we'll cover the 10 best free AI punctuation checkers for proofreading and grammar in 2026. Let's dive in!

How to Choose an AI Punctuation Checker

Writers use many platforms to draft content, so a good tool should work where you write most. It also helps to have features beyond punctuation, especially if you want rewriting help or tone adjustments.

Here are a few things to keep in mind while browsing our list of AI punctuation checkers:

• Does the tool work where you write? - You should be able to use it across websites like email, docs, and content platforms.

• Does the tool offer free usage you can rely on? - Make sure the free plan is enough for daily or frequent checks.

• Does the tool offer rewriting features? - Some tools let you rephrase sentences for clarity instead of only flagging errors.

• Does the tool help with adjusting tone? - Useful when you need writing to sound more formal, casual, or friendly.

• Does the tool provide proofreading support? - Punctuation is great, but grammar and clarity fixes help your final draft.

• Does the tool offer suggestions that feel natural? - You want feedback that improves your writing without changing your voice.

Try a couple of tools to see which feels natural to use and supports your writing workflow.

10 Best Free AI Punctuation Checkers

Without further ado, here's our list of the 10 best free AI punctuation checkers in 2026:

1. Grammit

First up on our list of the best free Trinka AI alternatives is Grammit. Grammit is your own personal AI writing assistant that helps you catch mistakes and improve your writing anywhere you work.

Here's how Grammit stands out:

• AI-powered grammar checking - Grammit helps you check your grammar, catch mistakes, and suggest improvements using AI.

• AI writing assistant - Use Grammit to paraphrase, rewrite, and improve your writing. Ask questions and give it custom prompts to get the best results.

• Grammit works anywhere - Take Grammit with you anywhere you work to improve your writing.

• Privacy first - Grammit puts privacy first and checks your writing directly on your computer using a local, on-device LLM, It never sends your writing to external servers.

• Price - Grammit is free!

2. Quillbot

Quillbot helps rewrite sentences for clarity while also fixing punctuation issues. It can simplify wordy lines and adjust phrasing to read more naturally.

Writers use it to smooth out awkward sentences and tighten up language. It’s helpful when you want your text to feel cleaner and easier to read.

Price: Free plan available, but only includes limited usage of advanced features, paid plans start at $99.96/year.

3. Grammarly

Grammarly AI checks punctuation, grammar, and sentence structure as you write. It highlights errors and explains why something might need correction.

It's useful for catching small mistakes that are easy to miss. Tools like Grammarly support general writing cleanup and helps refine tone and clarity.

Price: Grammarly does offer a free version, but on this version you don't get unlimited access to its AI features. Grammarly Premium starts at $30/month.

4. Wordvice AI

Wordvice AI reviews writing for punctuation accuracy and sentence quality. It suggests changes that make writing clearer and more consistent.

The tool also flags complex sentences that may need tightening. Writers can use tools like Wordvice to smooth formal writing like essays and reports.

Price: Only offers 5,000 words for free every month. To get full access, you have to pay $19.95/month.

5. LanguageTool

LanguageTool detects punctuation issues such as missing commas, spacing problems, and sentence boundaries.

It works for multilingual writing and keeps sentence structure readable. Writers often use it to clean up text in draft stages. It supports clearer messaging without changing voice.

Price: It has a free plan, but AI features are only available on the Premium plan ($24.90/month).

6. ProWritingAid

ProWritingAid checks punctuation while also reviewing sentence clarity and structure. It highlights repetitive patterns and helps refine overall flow.

Writers use it to clean up longer documents and reduce distracting mistakes. It encourages more thoughtful editing during revision.

Price: 500 word count limit on the free plan. Paid plans start at $120/year.

7. Grammar Check AI

Grammar Check AI reviews text for punctuation, check grammar, and sentence-level issues. It points out errors and gives suggestions to correct them.

It helps with quick proofreading before publishing or sending a message. Writers use it to catch straightforward mistakes fast.

Price: Limited free credits. Paid plans start at $5/month.

8. Trinka AI

Trinka AI focuses on formal and academic writing and reviews punctuation for correctness. It adjusts phrasing to improve clarity without changing meaning.

Tools like Trinka AI are solid for technical or research-heavy work. They support structured writing where accuracy matters.

Price: Only 5,000 free words/month. Paid plans start at $20/month.

9. ZeroGPT

ZeroGPT includes punctuation and grammar correction alongside its writing tools. It helps resolve basic sentence issues such as comma placement or missing punctuation marks.

It's best for short text cleanup. It’s suited for quick corrections when preparing simple content.

Price: Offers a free plan with limited usage. Pro is $9.99/month.

10. Scribbr

Scribbr reviews writing for punctuation, grammar, and readability. It suggests changes that make sentences smoother and easier to follow.

It helps you finalize drafts before submission or posting. It supports polishing writing for better flow and correctness.

Price: Scribbr is not free, but you can see how many mistakes there are in your document if you upload a file.

What is the Best AI Punctuation Checker?

The best AI punctuation checker depends on what you need most. For quick checks, many people prefer tools with simple copy and paste workflows.

If you write often, a browser extension might help you avoid mistakes as you type. Some tools also include grammar and style feedback, which is helpful if you want deeper editing support.

We recommend that you try a few options and choose the one that feels best for your writing style.

To recap, our recommendation for the best AI punctuation checkers is Grammit. Grammit is your personal AI grammar checker and writing assistant that works on any website.

Give Grammit a try for free today!