Annotate PDF
Mark up any PDF
right in your browser
Highlight passages, add underlines, draw freehand, place arrows, and leave comments — all on top of any PDF without installing anything.
File never leaves your device
Annotation types
Highlight
Colour behind text to mark important passages. Adjust colour and opacity freely.
Underline
Draw a line under text for emphasis — leaves the text fully visible.
Strikethrough
Cross out superseded or deleted text with a horizontal line.
Freehand
Draw freely with a pen tool — circle items, add arrows, or mark anything on the page.
Arrow
Draw an arrow to point at specific elements, call out details, or connect notes.
Shape
Place rectangles, circles, and lines to frame or group content on the page.
Frequently asked questions
What annotation types are available?
You can add highlights, underlines, strikethroughs, freehand drawings, arrows, shapes, and sticky-note style text comments anywhere on the page.
Will annotations be visible in Adobe Reader?
Yes. Annotations are embedded in the downloaded PDF as standard overlay objects. They are fully visible in Adobe Reader, Chrome PDF viewer, and any major PDF reader.
Can I change the colour and opacity of annotations?
Yes. Select any annotation and use the Properties panel to change the colour and opacity to any value you need.
Can I annotate scanned PDFs?
Yes. Annotations are overlaid on the page image regardless of whether the PDF contains selectable text. You can annotate any PDF.
Can I delete or edit an annotation after placing it?
Yes. Select the annotation with the Select tool to move, resize, or delete it. You can also undo with Cmd+Z immediately after placing.