Chat with Your PDFs Easily by Uploading

Yes, chatting with PDF using UPDF AI is free, but there are specific limitations: you can upload a maximum of 5 PDFs, with each PDF limited to 10MB and 100 pages. Additionally, users can ask up to 100 questions, and you can have conversations with up to 5 PDFs simultaneously.

If you desire more benefits, you can upgrade to the paid version, which offers unlimited access to all features. This includes unlimited PDF uploads, page limits, and questions.

Absolutely. We prioritize your privacy and employ robust security measures to protect your documents and personal data. We are committed to safeguarding your personal information and will never share or sell your data to third parties without your consent, except as required by law or with your explicit permission. For more detailed information on how we handle your data, please refer to our Privacy Policy.

No, you can use UPDF AI without creating an account. Unregistered users can access all features in guest mode for free.

UPDF AI integrates two AI models: GPT-5 and the full-size DeepSeek R1. Users can freely switch between these models. If you don't switch manually, the default model will be GPT-5.

Currently, it supports PDF files only. If you need to upload other formats, you can first convert them to PDF using UPDF.

We’re also working on expanding support for additional file types, including Word, in the near future.

The online version currently does not support chatting with scanned PDFs directly. However, you can use the "Chat with Image" feature—simply take a screenshot of your scanned PDF, paste it into the chat, and ask your questions. UPDF AI will analyze the image and provide answers.

Alternatively, you can download the UPDF app and use its OCR feature to convert scanned PDFs into searchable and editable PDFs. Once converted, you can chat with the document using the built-in AI features.

You can ask anything related to your PDF, such as summaries, translations, or explanations. For example, you can ask, “Can you summarize page 2?” or “What does this text mean: [Copy and paste the text here]?” You can also ask questions unrelated to PDFs, as any text-based inquiries are supported.

For more details on how to make the most out of your AI-powered PDF assistant, check out our Guide to AI Prompts with UPDF AI.