Annotation vs. Editing Content
First, tell these two apart:
- Annotation (comments): adding marks and comments on the PDF without changing the original content—similar to marking up a paper draft with a pen
- Editing content: directly changing text and images in the PDF
For review situations, use annotation—mark your opinions alongside, and the author revises based on the comments. Directly changing the original text is editing, suitable for finalizing your own document. When reviewing someone else's document, prefer annotation to preserve a trail of changes.
Common Annotation Tools and When to Use Them
Highlight
Mark important paragraphs. Select text and add a highlight color. Good for marking key sentences and content to review later.
Underline/Strikethrough
Underline for emphasis; strikethrough to suggest deletion. Strikethrough is very practical when proofreading—it clearly tells the author "this paragraph should be deleted."
Sticky Note Comment
Add text comments in the margin or at a specified position. Good for writing detailed revision opinions. Click the note to expand and read the content without taking up layout space.
Line/Arrow/Shape
Draw circles, arrows pointing to something, or box-select an area. Good for marking diagrams and position-related issues.
Text Box
Add text explanations anywhere on the page. More visible than a sticky note—content shows directly.
Stamp
Apply stamps like "Reviewed" or "Confidential." Good for process marking.
Efficient Use of Annotations
Use Color to Distinguish Types
Agree on color meanings: yellow highlight = key point, red = issue, green = praise. A unified color convention lets the author tell at a glance.
Be Specific in Comments
"Change this here" is an ineffective comment. Write "Suggest changing 'quickly' to 'within 24 hours'—more specific." Specific comments are easier for the author to act on.
Link to Position
A sticky note should be linked to the corresponding text—don't let it float in the margin with no indication of what it refers to. Select the text first, then add a comment to auto-link.
Summarize by Page Number
After reviewing a long document, list all comments by page number so the author can process them one by one.
Annotating with DocsAll
The PDF Edit Tool supports annotation features and runs in the browser:
- Upload the PDF
- Choose an annotation tool (highlight, comment, shape, etc.)
- Select text or a position to add the annotation
- Save (annotations are preserved in the PDF)
Files are not uploaded to the server—safer for reviewing contracts and bids with sensitive content.
Notes on Annotation
Compatibility
Different readers vary in their support for annotations. Standard tools (highlight, sticky note) have good compatibility; special shapes may not be visible in other readers.
Annotations Preserve Author Info
Comments carry the annotator's name by default. Be careful when reviewing sensitive documents, or clean up annotator info before exporting.
Don't Treat Annotations as the Final Version
Annotations are review opinions—the final version should be a clean copy saved separately without annotations. Sending out a mixed version is embarrassing.
Summary
Annotation is a review powerhouse—the key is "use the right type + write specific opinions." Standardize colors, link comments to positions, and be specific in content. After reviewing, export a clean final version. DocsAll's annotation runs in the browser—no need to worry about leaks when reviewing sensitive documents.