Key specs

PDF.ai key specs
Price	Free plan
Free limits	1 PDF, 100 questions/month, OCR 2 pages per file
Paid price	Pro $10/month per user · Ultimate $20/month · Enterprise $30/month (billed annually)
Student / edu discount	No
Korean	PartialUI is in English. Korean documents and queries are supported.
Login	Required
Platforms	Web · Browser extension
File input	PDF
Download output	Export chat
Commercial use	UnverifiedCheck the terms of service

Prices may change. Currency and billing period follow the official listing; no currency conversion. Pricing page (opens in a new tab)

Who it's for

Anyone who wants to ask questions on the spot while reading paper or report PDFs in a browser. No need to upload files separately, keeping your reading flow uninterrupted on academic sites.
Users who want to query multiple documents together in one chat. Paid plans support document bundles, allowing you to ask about differences across files.
College students who want specific paragraphs from English papers explained in Korean. You can drag a paragraph and ask, "Explain this part easily."

The free plan's document and question limits are small, requiring a paid plan for more than basic testing.
The interface is in English, and Korean summary quality is often rated below NotebookLM or Lilys AI.
It only handles PDFs. Word documents, PPTs, and web pages require other tools.

Sign up on the official website and install the PDF.ai extension from the Chrome Web Store.
Open a PDF in your browser to see the chat panel on the right. You can also upload files directly on the website.
Ask questions in Korean. Example: "Summarize the research method of this paper in three lines."
Click the citations in the answer to check the original text. Always verify numbers and dates against the source.
If you handle documents frequently, consider the Pro plan for multi-document queries. You can try the free document limit first before deciding.

ChatPDF Free plan ChatPDF works instantly without login, while PDF.ai attaches to open documents via a browser extension.
Sider Paid Sider summarizes and translates any web page, not just PDFs.
Humata Free plan Humata limits free usage by total page count, while PDF.ai limits by document count and monthly questions.

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