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Highlight and annotate a PDF
Mark text with a highlighter, underline or strike it through, write notes, draw by hand, add arrows and shapes. Other PDF readers show your marks as comments.
Why the limit? The editor works on your file on your own device, with nothing uploaded. That takes browser features only recent desktop versions of Chrome and Edge have.
or drop one anywhere on this page
Your file stays on this device. Nothing is uploaded.
Highlight like on paper
Drag across the words. The color lies over the paper and the letters stay as dark as they were.
Notes, arrows and shapes
Pin a note where a remark belongs, point at a figure with an arrow, frame a passage with a rectangle or an ellipse, or draw by hand.
Standard PDF comments
Marks are saved as the PDF’s own annotations, so the page content is not touched and other programs read them as comments. We check them with the PDF readers built into Chrome, Firefox and macOS.
Change them later
Select a mark to change its color or delete it. Notes, lines, arrows, shapes and drawings can also be moved, and all of these but notes made thicker or thinner. A highlight, an underline or a strike-through stays on its text. Comments made in other programs can be deleted too, and moved unless they mark text.
How to highlight text in a PDF
Open your PDF: choose the file or drop it on this page.
Pick the highlighter from the mark-up tools, or press H.
Drag across the text you want to mark.
Save. Your highlights are in the file.
The editor is right here. Open your PDF to begin.
Questions and answers
Can other people see my comments?
Yes, anyone you give the saved file to. The marks are standard PDF annotations, so their reader shows them.
Can I remove highlights somebody else made?
Yes. Click the highlight to select it and press Delete.
Can I highlight a scanned page?
Yes. Drag a rectangle over the lines, or let OasisPDF read the words first and mark them like any other text.