PDF Annotator — Frequently Asked Questions
Everything you need to know about using PDF Annotator.
Is my PDF uploaded?
No. PDF rendering and annotation happens entirely in your browser using pdfjs and pdf-lib. Your document never leaves your device.
Can I edit annotations after saving?
Annotations are baked into the downloaded PDF — they become part of the document content. To re-edit, work with the original PDF and re-annotate. Future versions of the tool may support editable annotation layers.
Will my annotations show in other PDF viewers?
Yes. Since the annotations are drawn directly onto the page content, every PDF viewer (Adobe Reader, Preview, Chrome, mobile apps) displays them identically.
Can I annotate scanned PDFs?
Yes — the tool works on any PDF regardless of whether it’s text-based or scanned. Annotations are drawn over the page image.
How many annotations can I add?
No hard limit. Most users add 5-20 per document, which works well. Very large numbers (hundreds) may slow your browser.
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