PDF for researchers
Articles, papers, datasets, and references are the foundation of your work. Here nothing is sent to a server: each PDF is processed only on your computer.
Tools
Extract text from papers
Extract text from PDF articles to cite, analyze, or feed your research notes.
Extract text →Merge references
Combine several papers and chapters into a single PDF to review literature seamlessly.
Merge PDF →OCR scanned articles
Turn digitized articles and theses into searchable PDF to find terms with Ctrl+F.
Free OCR (basic) →Split chapters
Extract specific chapters or sections from a large PDF for focused reading.
Split PDF → 0 bytes sent — this file never leaves your computer
In doubt? Open DevTools (F12) → Network tab: no upload occurs.
Related tools
Frequently asked questions
Are unpublished research data safe?
Yes. Everything is processed in your browser; papers and datasets are never sent to a server. No upload means no risk of material leaking before publication.
Does OCR preserve text for later searching?
Yes. OCR generates a searchable text layer over the scanned document, allowing you to search terms and copy excerpts.