ChatPDF vs SummarizePaper for research papers (2026)
Key takeaways
- ChatPDF is a chat for any PDF: upload a document, ask questions, get answers. Free for 2 documents a day.
- SummarizePaper is built for arXiv papers: type the arXiv ID and get a full summary page (detailed summary, key points, lay summary, related papers, BibTeX), plus an assistant for questions.
- Use ChatPDF for journal articles, reports and anything that is not on arXiv. Use SummarizePaper for arXiv papers and to follow new ones by email.
Disclosure: this comparison is written by the creator of SummarizePaper. ChatPDF features were checked on its site on 18 October 2026.
ChatPDF vs SummarizePaper at a glance
| ChatPDF | SummarizePaper | |
|---|---|---|
| Works with | Any PDF you upload | Papers on arXiv, from the arXiv ID |
| What you get | Answers in a chat | A summary page: detailed summary, key points, lay summary, blog-style article, related papers, BibTeX, PDF export |
| Questions on the paper | Yes | Yes, from the full text |
| Several papers at once | Yes, multi-file chats | Yes, on the chat page |
| Account needed | No | No to read; free account for the digest and more questions |
| Free limits | 2 documents a day | Unlimited reading, 10 new summaries and 30 questions a day without an account |
| Paid plan | ChatPDF Plus, unlimited documents | Premium €7/month |
| Summary languages | Not checked | English and French |
| New papers by email | No | Daily digest by arXiv category |
What ChatPDF does better
- Any document. Journal articles behind a publisher's site, theses, reports, books: if you have the PDF, ChatPDF reads it. SummarizePaper only covers arXiv.
- Free-form questions. You steer the conversation from the first message, which suits a precise question such as "what sample size did they use?".
- More than papers. ChatPDF also offers chat on YouTube videos and writing tools.
What SummarizePaper does better
- No download, no upload. Type the arXiv ID or search the home page; if someone already summarized the paper, the summary page opens immediately.
- A summary you do not have to ask for. The page is structured the same way for every paper, including a lay summary anyone can understand.
- Something you can keep and share. Each summary is a public page with the BibTeX entry and a PDF export, not a chat that disappears in your history.
- Following the field. The daily digest emails up to 10 new papers every weekday from the arXiv categories you choose.
Which one should you use?
| Your situation | Use |
|---|---|
| The paper is on arXiv | SummarizePaper |
| The paper is a journal PDF or not public | ChatPDF |
| You have one precise question about a document | ChatPDF, or the SummarizePaper assistant for arXiv papers |
| You want to decide quickly whether to read a paper | SummarizePaper |
| You want new papers in your field every morning | SummarizePaper |
Who SummarizePaper is not for
If most of what you read is not on arXiv, ChatPDF or another PDF tool will serve you better: SummarizePaper cannot read files you upload.
For other options, see Best AI tools to summarize arXiv papers. If you are leaving Scholarcy, see Scholarcy alternatives.
FAQ
Is ChatPDF free?
ChatPDF has a free plan that lets you analyze 2 documents a day, without signing up. ChatPDF Plus removes that limit.
Is SummarizePaper free?
Yes. Reading existing summaries is unlimited. Free users can start 10 new summaries a day and ask 30 questions a day without an account, or 100 with a free account. Premium costs €7 per month.
Can SummarizePaper summarize a PDF I upload?
No. SummarizePaper only works with papers on arXiv, from their arXiv ID. For journal articles or other PDFs, use ChatPDF or a similar tool.
Which one is better for an arXiv paper?
SummarizePaper, because you do not need to download and upload the PDF, and you get a complete summary page, including a lay summary and the BibTeX entry, that you can share or come back to.
Can I ask questions across several papers?
Both can. ChatPDF lets you bring several PDFs into one chat. SummarizePaper's assistant answers from the full text of one or several arXiv papers.