7 Best Free Comma Checkers to Try in 2026

Do you ever spend a lot of time thinking about word choice and sentence flow? Despite that, commas can still be easy to get wrong. A missing comma can make a sentence feel confusing, while an extra one can slow readers down or change the meaning.

When you are editing your own work, these small mistakes are hard to catch. A comma checker helps you spot issues quickly and feel more confident before you publish.

In this article, we'll cover the 7 best free comma checkers to try in 2026.

What Do Comma Checkers Do?

Comma checkers help writers review their punctuation by scanning text for common comma-related mistakes. They are designed to catch errors that are easy to miss when you are rereading your own work.

Here are a few things that comma checkers help with:

• Flagging missing commas in common situations like introductory phrases and compound sentences.

• Identifying unnecessary commas that break up sentences or disrupt flow.

• Catching comma splices where two complete sentences are joined with only a comma.

• Checking comma usage in lists, including consistency with serial commas.

• Highlighting comma-related issues that affect clarity and readability.

Many comma checkers also work as a punctuation checker or AI grammar checker, which means they often catch related grammar issues at the same time.

What About Comma Splices?

Comma splices happen when two complete sentences are joined with just a comma. They are one of the most common comma mistakes writers make.

A good comma checker will flag comma splices and suggest fixes, such as adding a conjunction or splitting the sentence. This is helpful because comma splices can be hard to spot on your own, especially during fast drafting.

How to Choose a Comma Checker

When you are deciding which comma checker to use, it helps to think about your actual writing habits. The right tool should fit naturally into your workflow and make editing feel easier, not more complicated.

Here are a few things to keep in mind when looking for a comma checker:

• Free usage - Make sure the tool gives you real value without forcing you into a paid plan just to fix basic comma mistakes.

• Working on any website - Tools that work across email, docs, and web editors are easier to stick with long term.

• Spelling and grammar suggestions - A solid comma checker should also catch simple spelling and grammar issues while you edit.

• Rewriting help - Some tools go a step further and suggest small rewrites when punctuation alone does not fix the sentence.

If a tool saves you a few minutes every time you edit, it is doing its job. Trying a couple of free options can quickly show you which one feels most natural to use.

7 Best Free Comma Checkers in 2026

Here's our list of the 7 best free comma checkers in 2026:

1. Grammit

First up on our list of the best comma checkers 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 & punctuation 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. Grammarly

Grammarly is a well-known punctuation checker that includes comma checks in its free plan. It highlights missing or unnecessary commas and explains the rules behind many suggestions.

The browser extension makes it easy to check commas while writing emails or documents online. Tools like Grammarly work best for general writing rather than technical style rules.

3. LanguageTool

LanguageTool is a free grammar and punctuation checker that supports many languages. It does a good job of proofreading and catching comma placement issues, especially in complex sentences.

The tool often explains why a comma is needed, which helps writers improve over time. You can use it online or through browser add-ons for quick checks.

4. Wordvice AI

Wordvice AI offers a free grammar checker aimed at academic and professional writing. It checks commas, sentence structure, and general punctuation.

The feedback is usually clear and focused on readability. Writers working on essays or formal documents may find its suggestions helpful.

5. ProWritingAid

ProWritingAid includes comma checks as part of its free grammar reports. It looks at punctuation, sentence flow, and clarity.

The tool provides detailed feedback, which can be useful if you want to dig into why a comma is flagged. Tools like ProWritingAid suits writers who like deeper explanations.

6. SpinBot

SpinBot is mostly known as a rewriting tool, but it also includes basic grammar and comma checks. It can catch simple comma mistakes while you revise text.

The interface is very straightforward, making it easy to use for quick edits. It does not offer deep explanations, so it works better for fast checks.

7. Grammar Check AI

Grammar Check AI is a free online punctuation checker that focuses on common grammar issues. It highlights comma errors and other punctuation problems in pasted text.

While explanations are brief, it still helps catch obvious mistakes. It is useful when you need a fast review before publishing.

What is the Best Comma Checker in 2026?

Our recommendation for the best comma checker in 2026 depends on how you write and what kind of feedback you want. If you prefer clear explanations and a simple experience, tools that focus on feedback are best for you.

Since many of these tools are free, trying a few can help you find the one that fits your workflow best.

To recap, use Grammit to check your grammar and punctuation to catch mistakes anywhere you write in real-time. Grammit is your personal AI grammar checker and writing assistant that works on any website.

Give Grammit a try for free today!