DeepPDF

Online PDF research assistant that supports conversing with documents, bilingual parallel translation, long text summarization, interpretation of charts and formulas, as well as OCR and format conversion. The official states that the maximum file size for a single document is 200MB and translation covers more than 100 languages.

AI Document Generator#Office Document#Document Processing#AI Office

Updated: 2026-10-26

What is DeepPDF?

DeepPDF is an AI reading and research assistant centered around PDFs. Officially, it is described as a deep learning AI research assistant, and its onboarding process is summarized in three steps: upload, ask questions or select features, and export results. It preserves page numbers, layout, and the positions of charts, making it easier to return to the original text for verification when seeking answers. This makes it more suitable for reading research papers and technical documents than simply pasting PDFs into a general-purpose chat box. For users who need to revisit the same document repeatedly, conversation history and annotations are more useful than one-time summaries.

Who is it for?

Graduate students and researchers: Read English papers and verify the derivation processes of formulas.
Technical and legal professionals: Reading specification documents, contracts and standard documents.
International students: Need bilingual comparison to quickly understand textbooks.
Consultants and analysts: Convert multiple PDFs into searchable and comparable text.
Editors and science popularizers: Verify citations and translation of technical terms, and transform research papers into explanatory scripts.

Key features

Chat with PDF

After uploading, you can ask questions about the content, extract specific information and request explanations. The official states that it is suitable for research papers and business documents, and you can also directly specify the type of data you need.

Bilingual Contrastive Translation

The official states that it provides a side-by-side bilingual view, supports over 100 languages, and retains the original layout as much as during translation for easy left-right comparison; long sentences are recommended to be checked paragraph by paragraph, as machine translation is prone to distortion at clauses.

Long Document Summary

Condenses long PDFs into key points, helping you first grasp the structure before deciding which sections to close reading; the summary retains the chapter order for easy review by section.

Interpretation of Charts and Formulas

Can identify and explain images, charts, and mathematical formulas, and provide definitions for professional terms; explain formulas symbol by symbol, and it is still recommended to return to the original text for complex derivations.

Annotations, Rewriting and OCR

Supports annotating documents and explaining new words, and can rewrite and polish selected text; scanned documents can be processed via OCR, and there are also format conversion, AI academic search, and PDF to explanatory video; OCR quality depends on scanning clarity, and blurry pages should be retaken first.

Ultra-long documents

The official states that the maximum file size per document is 200MB, making it suitable for a full report or a single volume of a collected thesis.

How to use DeepPDF

Split single files larger than 200MB first for more accurate Q&A positioning.
confirm the OCR recognition rate for scanned documents.
remove irrelevant appendages before uploading to make the model more focused.
First generate a summary to establish the structure, then ask questions section by section.
this is more effective than asking for specific details right away.
When reading papers in batches, first create a unified list of questions to make horizontal comparison easier.
arrange the list in the order of chapters so that the answers match.
Check the interpretation results of formulas and charts against the original text, as the model may misread superscripts and subscripts.
use translations for comprehension and refer to the original text for formal citations.
After converting the format, check if tables and formulas are misaligned.
before uploading confidential documents, review the privacy policy, as official rules may be adjusted.