PDF annotation covers a broad set of tasks: leaving a comment for a colleague, marking up a contract before signing, highlighting research for later reference, or drawing attention to a specific section of a report. The right tool depends on what you are trying to do and whether you need the annotations to be editable or permanent.
Types of Annotation
Text annotations add typed comments or text boxes directly on the page. The text floats over the PDF content and can be positioned anywhere on the page.
Highlights apply a color overlay to selected text. The underlying text remains readable and the highlight draws attention to specific passages.
Notes are comment bubbles anchored to a specific point on the page. Common in document review workflows where multiple reviewers leave feedback.
Shapes include rectangles, circles, arrows, and lines. Useful for drawing attention to specific areas of diagrams, images, or page regions where text annotation would not be precise enough.
Stamps are predefined labels that can be placed on pages. Common stamps include Approved, Draft, Confidential, and similar markers used in document review processes.
Freehand drawing lets you draw directly on the PDF page with your mouse or stylus. Useful for marking up diagrams, circling items, or adding handwritten-style notes.
How PDFHaul Annotation Works
PDFHaul's annotation tool supports text, highlights, notes, shapes, stamps, images, and freehand drawing. Open your PDF at pdfhaul.com/annotate-pdf and select the annotation type from the toolbar. Each annotation is placed on the page and can be repositioned before you download the final document.
Files up to 50MB are supported. No account is required. Files are automatically deleted after two hours.
Editable vs Flattened Annotations
When you download an annotated PDF from PDFHaul, the annotations are flattened into the page. This means they become part of the page image and cannot be moved, edited, or removed by the recipient. This is appropriate for final documents. If you need annotations that remain editable after sharing (for example, in a document review workflow where a colleague needs to respond to your comments), you need a tool that preserves annotations as separate layers.
Adobe Acrobat and PDF-XChange Editor both support editable annotation layers that can be viewed, responded to, and removed separately from the document content. For internal review workflows this matters. For marking up a document before printing or sharing a final version, flattened annotations are fine.
Annotation for Specific Use Cases
Document review: use notes for comments tied to specific points, highlights for passages that need attention, and text annotations for suggested edits. If the reviewer needs to respond to each comment, a tool with editable annotation layers is better than PDFHaul.
Contract markup: use highlights to flag clauses for discussion, text annotations to propose alternative wording, and shapes to bracket sections requiring attention.
Research and study: highlights with different colors for different themes or categories. Text annotations to summarize key points in your own words.
Diagram markup: shapes and freehand drawing to circle, arrow, or label specific elements. More precise than text annotations for spatial content.
How Free PDF Annotation Tools Compare
PDFHaul
Free, no account, 50MB limit, flattened annotations on download, files deleted after two hours. Supports text, highlights, notes, shapes, stamps, images, and freehand drawing. No daily limit.
Adobe Acrobat Reader
Free desktop application with comprehensive annotation support including editable annotation layers. The most full-featured free annotation tool available. Annotations remain editable and can be shared with other Acrobat users. No file size limits for local files.
PDF-XChange Editor
Free Windows desktop application with strong annotation features including editable layers. A good alternative to Adobe Reader on Windows with a lighter install footprint.
Smallpdf and iLovePDF
Both offer basic annotation tools online with daily free limits. Suitable for occasional use.
Preview (macOS)
The built-in PDF viewer on Mac includes annotation tools: text, shapes, highlights, and signatures. Free, unlimited, offline, no upload needed. Good for basic annotation on Mac without installing anything additional.
Frequently Asked Questions
Can the recipient edit or remove my annotations?
No. PDFHaul flattens annotations into the page on download. They become part of the page and cannot be separated from it.
Can I annotate on mobile?
Yes. PDFHaul works in mobile browsers. For frequent mobile annotation, the PDFHaul app is available on iOS and Android.
Can I add an image to the PDF as an annotation?
Yes. The Image tool in the annotation toolbar lets you upload an image and place it on the page.
Related Tools
Annotate PDF
Highlight PDF
Redact PDF
Sign PDF
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Written by PDFHaul Team
Expert team specializing in PDF processing and document management. We share practical tips, tutorials, and best practices to help you work smarter with PDFs.
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