How to Add Annotations To PDF
Annotations let you mark up a PDF with comments, corrections, questions, and instructions without altering the original content. They're essential for collaborative review workflows—editors, lawyers, designers, and teachers all rely on annotations to communicate feedback directly on the document. SublimePDF supports a full range of annotation types from simple comments to structured review marks.
Follow the step-by-step instructions below, then use the free tool directly — no registration or download required.
Open Tool →How to Add Annotations To PDF — Step by Step
Upload your PDF
Open the Annotate PDF tool and upload the document you need to review or mark up. All pages load in the editor with annotation tools accessible from the toolbar.
Select an annotation type
Choose from text comments (click to place a comment popup), highlighting (select text to highlight in yellow, green, pink, or blue), underline, strikethrough, or freehand drawing for more expressive markup.
Add your annotations
Click or select text on the page to place annotations. Type your comment or feedback in the popup. Each annotation captures your name and timestamp automatically for tracking purposes.
Organize and categorize
Use color coding to categorize annotations: yellow for general comments, red for critical issues, green for approvals. The annotation sidebar lists all marks with page numbers for quick navigation.
Save the annotated PDF
Click 'Save' to embed all annotations in the PDF. Recipients can view, reply to, and resolve annotations in any PDF reader that supports the annotation standard (Adobe Acrobat, Preview, etc.).
Pro Tips
- 💡 Use strikethrough with a comment for suggested deletions, and text insertion marks for additions—this mimics traditional proofreading marks that editors expect.
- 💡 Set your author name in the settings before annotating so that comments are attributed correctly in collaborative review workflows.
- 💡 For design reviews, combine freehand drawing (to circle problem areas) with text comments (to explain the issue) for clear, actionable feedback.
- 💡 Export the annotation summary as a separate text document for meetings—it lists every comment, its page number, and author without needing to flip through the PDF.
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 Add Annotations To PDF — FAQ
Can multiple people annotate the same PDF?
Do annotations change the original PDF content?
Are annotations visible when printing?
Can I import annotations from another copy of the same PDF?
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