Free Online AI Proofreader - ChatGPT 4.1 and DeepSeek

UPDF AI

Free Online AI Proofreader Tool

UPDF AI Proofreader quickly detects errors and offers corrections to make your content clear, professional, and easy to read. Just type “Proofread:” followed by your text, then hit send to get the corrected version.

Powered by

GPT-4.1 | DeepSeek R1

5000+ Reviews

4.8

UPDF AI available on

Desktop & mobile app

Mac

Windows

iOS & iPad OS

Android

2M+ Users, 215M+ Proofreadings, Trusted by Leading Medias:

How to Proofread Online for free

You can enter the prompt like “Proofread:”, then, copy and paste the content after the prompt in the chatbox.
Select the AI model. By default, you are using the ChatGPT 4.1 mode, if you want to use DeepSeek, click on the “DeepThink” to enable it.
Now, you can click on the “Send” button. In seconds, you can get the result.

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Where UPDF AI Proofreader Makes the Biggest Impact

Perfect for Academic Writing

UPDF AI Proofreader is ideal for polishing academic content. It helps reduce errors in spelling, grammar, and formatting while enhancing readability and overall professionalism—making your writing clearer, more credible, and ready for submission or publication.

Polish Your Professional Documents

Make your documents more precise and professional to enhance your personal or corporate image. Whether it’s a resume, company profile, or project proposal, UPDF AI Proofreader helps you eliminate grammar mistakes, polish your language, and ensure every sentence reflects a high level of professionalism.

Ensure Clarity in Legal Documents

UPDF AI Proofreader helps you maintain precision and eliminate ambiguity in legal documents. Whether you're drafting contracts, terms of service, or formal statements, it ensures that your language is clear, accurate, and free from misleading expressions—reducing the risk of misunderstandings or legal disputes.

UPDF AI Proofreader Ensures Clarity in Legal Documents

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Why Use UPDF AI Proofreader?

Accurate and Reliable Proofreading

With UPDF AI Proofreader, you can enjoy highly accurate and reliable proofreading results, thanks to its integration of cutting-edge AI models—ChatGPT-4.1 and Full DeepSeek R1—designed to enhance grammar correction, clarity, and overall writing quality.

All Language Support

UPDF AI supports proofreading in nearly all languages, including widely spoken ones like English, Chinese, Spanish, and German, as well as less commonly used languages such as Icelandic, Swahili, Basque, and Maltese—making it a truly global AI proofreading assistant.

More than AI Proofreader

If you regularly work with writing or content, UPDF AI Proofreader is a must-have. It not only proofreads your text but also helps you rewrite, generate ideas, summarize content, translate across languages, and much more—all in one tool.

UPDF AI Proofreader
vs. Other Proofreaders

UPDF AI
Proofreader

Other AI
Proofreaders

Free

Accuracy

99%

80%

No Word Limits

No Sign Up Required

Chat with PDF

Chat with Image

PDF to Mind Map

Platform Supported

Online, Windows, Mac, Android, iOS

Online

FAQs About Using UPDF AI Proofreader

Q1. Is UPDF AI Proofreader free to use?

Yes, UPDF AI offers a free version with 100 free prompts. To use more tasks after using up the 100 free prompts, you need to pay the license. But the price is very low. Check and upgrade here.

Q2. How is UPDF AI different from other proofreading tools?

Unlike other proofreading tools, UPDF AI uses multi-model AI (ChatGPT + DeepSeek) for deeper contextual understanding, more accurate suggestions, and additional functions like PDF chatting, image chatting, content translation, and more.

Q3. Can I proofread entire documents or just small sections?

You can proofread both as you can copy the whole document content or small sections into the UPDF’s chat box to proofread.

Q4. Can I customize the proofreading level (e.g., formal, casual)?

Yes. What you need to do is to enter the prompt with proofreading level requirement. For example, you can enter the prompt “Proofread with formal level: ”

Q5.Can I use UPDF AI Proofreader offline?

Now, you cannot use UPDF AI Proofreader offline as it needs internet for ChatGPT and DeepSeek to work.