How to Draw On PDF
Sometimes typed text and standard annotations aren't enough—you need to circle a paragraph, draw an arrow to a specific element, sketch a correction on a diagram, or handwrite a signature. Drawing directly on a PDF gives you the freedom to mark up documents in ways that structured annotation tools can't. SublimePDF provides freehand, shape, and line drawing tools with pen pressure and color options.
Follow the step-by-step instructions below, then use the free tool directly — no registration or download required.
Open Tool →How to Draw On PDF — Step by Step
Upload your PDF
Open the Draw on PDF tool and upload your document. The editor enters drawing mode with pen tool options in the toolbar.
Select your drawing tool
Choose freehand pen for handwriting and informal marks, straight line for precise connections and arrows, or shape tools for circles, rectangles, and ovals to frame content areas.
Configure pen settings
Set the stroke color (any color), line thickness (1px for fine detail, 3–5px for visible marks, 8px+ for bold emphasis), and opacity. For a highlighter effect, use a thick stroke with 40% opacity in yellow.
Draw on the document
Click and drag to draw on the page. Freehand strokes follow your mouse or stylus movement. For shapes, click to set the start point and drag to size them. Hold Shift while drawing a line to snap to 45° angles.
Save your drawings
Click 'Save' to embed all drawings into the PDF. Drawings become part of the annotation layer by default, or choose 'Flatten' to merge them permanently into the page content.
Pro Tips
- 💡 Use a graphics tablet or stylus for freehand drawing—mouse input tends to produce shaky lines. If using a mouse, prefer shape tools over freehand for cleaner results.
- 💡 Draw circles or rectangles around important sections, then add an arrow and text annotation nearby to explain the markup.
- 💡 For architecture or engineering markup, use the straight line tool with arrows to indicate dimensions, flow directions, or connection points.
- 💡 Use the eraser tool to clean up mistakes without starting over—it removes strokes you've drawn without affecting the original PDF content.
Privacy & Security
All processing happens directly in your browser. Your files are never uploaded to any server — they remain on your device throughout the entire process. SublimePDF uses WebAssembly technology for fast, secure, client-side processing.
Works Everywhere
This tool works on any modern browser — Chrome, Firefox, Safari, or Edge — on desktop, tablet, or mobile. No software to install. PDF is an open ISO standard supported by all major platforms.
How to Draw On PDF — FAQ
Can I draw on top of existing images and diagrams?
Do drawings stay editable after saving?
Can I use a stylus or Apple Pencil?
Is there an undo function?
Related Guides
How to Add Page Numbers to PDF
Adding page numbers to a PDF makes documents easier to navigate and reference. Whether it's a report, manuscript, or legal document, SublimePDF lets you add customizable page numbers in seconds.
How to Convert Scanned PDF to Text
Scanned PDFs are essentially images — you can't select or search the text. OCR (Optical Character Recognition) technology converts these image-based PDFs into searchable, editable text. SublimePDF's OCR tool handles this conversion right in your browser.
How to Fill Out a PDF Form Online
Many important forms — tax documents, applications, contracts — come as PDF files. SublimePDF lets you fill them out directly in your browser without printing, handwriting, and scanning.