What is PDF Annotation?

PDF Annotation lets you mark up PDF documents right here — add text notes, highlight passages, draw freehand, and insert shapes. All annotation happens locally so your documents remain private.

Drop in any PDF and the tool reads every page locally. Highlight passages, drop typed sticky notes, sketch with the pen, or stamp shapes onto a specific page. When you download, all markups bake into the PDF as a fresh file with the original pages intact and your additions on top.

How to use

1. Upload a PDF document you want to annotate
2. Use the toolbar to add highlights, text notes, freehand drawings, or shapes on any page
3. Navigate between pages, then download the annotated PDF with all markups embedded

When to use

• Marking up a contract before sending feedback back to a lawyer or counterparty.
• Adding teacher comments to student PDFs without printing the assignment.
• Reviewing a research paper, highlighting passages, and saving notes for later citation.

Result

Reviewing a 20-page contract — highlight key clauses in yellow, add margin notes with questions for your lawyer, circle a suspicious date, and download the annotated version to share.

FAQ

Are my original PDF pages re-encoded or compressed during annotation?

No. The tool renders each page to a canvas for drawing on top, but on export it writes your annotations as a new visual layer over the untouched page content, so text stays selectable and image quality is unchanged.

Can I edit a highlight or note after I've placed it?

Yes. Switch to the Select tool, click any annotation, then drag to reposition or resize via the handles. To remove a single mark, select it and press Delete (or click the trash button) — or switch to the Eraser tool and click any mark. The rest of your page stays untouched, and switching pages restores everything you placed on each one.

Will form fields and links in the original PDF still work after annotation?

Interactive elements stay intact because annotations are drawn on a separate layer above the page. Hyperlinks remain clickable in any standard PDF viewer, and existing form fields keep their data entry behaviour.

What's the largest PDF I can annotate at once?

There is no hard cap, but performance depends on your device's memory. PDFs over 100 pages or scanned documents above 50 MB may render slowly on older mobile browsers. Split larger files into sections for smoother editing.

Can the annotations be removed later from the saved PDF?

Once exported, the annotations are flattened into the visual layer and are not separately editable. Keep the original PDF as a backup if you need a clean version to start over from.

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