Marking up homework or a manuscript
Circle the problem, write one line of correction advice, export and send it back.
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Guide
PDF Annotate is for drawing and writing straight onto a page: circle a mistake, band a sentence with a translucent colour, add a line of explanatory text, sketch an arrow by hand. Everything is flattened into the page as added content — it becomes part of the page rather than an annotation object that a reader can hide or delete.
Updated 2026-09-093 min read
PDF Annotate is for drawing and writing straight onto a page: circle a mistake, band a sentence with a translucent colour, add a line of explanatory text, sketch an arrow by hand. Everything is flattened into the page as added content — it becomes part of the page rather than an annotation object that a reader can hide or delete.
That makes it a good fit for marked-up drafts and review copies that go to someone else. If you need comments that can be collapsed and replied to, do that in a dedicated reader.
<original-name>_annotated.pdf.| Input | Output | Notes |
|---|---|---|
A red rectangle plus a line of text reading “This is wrong” on page 2 |
Both marks are written into page 2, the other pages unchanged |
Only annotated pages are processed |
Dragging the highlight tool across a paragraph |
A 35% band of colour over the text, which stays readable |
|
Annotating a page, then deleting that page in the workspace |
On write, the message “the page this annotation belongs to has been deleted, add it again” appears |
Marks are recorded against the current page order |
Circle the problem, write one line of correction advice, export and send it back.
Band the key terms of a contract with the highlighter so a colleague can see them at a glance.
Type into the blank boxes with the text tool instead of printing the page and writing by hand.
No. The marks have been flattened into the page content. Keep the original file; inside the editor, before writing, you can still undo and clear.
Because they are not annotation objects — they are shapes and text drawn directly into the page.
No. A highlight is composited at 35% opacity, so the text stays clearly readable.
Page rendering, annotation drawing and writing all happen locally in the browser, and neither the file nor the annotation content is uploaded.
Updated 2026-09-09
Add text, rectangles, ellipses, highlights and free-hand strokes, flattened onto the page by coordinates
Everything runs locally in your browser; files are never uploaded to a server