How to Annotate PDFs
SwiftPDFLab Editor includes a full suite of annotation tools. Highlight, underline and strike through text, add typed text notes, draw freehand, add shapes, sticky notes, callouts, measurements, and watermarks.
Step 1: Open Your PDF
Go to editor.swiftpdflab.com and upload the PDF you want to annotate.
Step 2: Select an Annotation Tool
Click Annotate in the sidebar. Choose from: Highlight to mark text, Underline and Strikethrough for text emphasis, Text for typed notes, Draw for freehand sketches, Shapes for rectangles, circles, and lines, Sticky Notes for comments, Callouts for labeled arrows, and Measure for distances.
Step 3: Customize Your Annotations
Change colors, line thickness, opacity, and font size using the options panel. Each annotation type has its own set of customizable properties.
Step 4: Add Watermarks
Use the Watermark tool to add text or image watermarks across pages. Customize position, rotation, and opacity.
Step 5: Download
Click Download to save your annotated PDF. All annotations are embedded directly into the file.
Pro Tip
Use keyboard shortcuts to switch between tools faster. Annotations are non-destructive until you download the final PDF.