Annotate your PDFs and never forget an important idea

Highlight text and add notes right when you read the paper

PDF annotations are in beta. Get more information on our forum.

Markup your papers in color and style

Highlight and underline the important parts of a paper.

Whether you stick with one color or devise a sophisticated color code to organize the information is up to you.

Markup and annotate research papers

Add sticky notes

Add rich formatting to your notes using Markdown.

Annotate papers collaboratively with your colleagues and collaborators in real-time

Add comments and notes to PDFs

Create beautiful summaries

Condense your annotations into a beautiful, printable summary.

Come back to your summary at any time and know exactly what this paper was about without re-reading it.

Summary of annotations of a PDF

Always in sync, never locked in

Your annotations are directly saved to the PDF and synced to Google Drive.

Paperpile uses open standards to make sure you can read and edit your annotations with any other standards compliant program.

Sync PDF annotations to Google Drive

Sign in with Google and get started in seconds