Can reviewers reply to comments?

No. This is a local markup tool. Comments are burned into the page on export.

Will highlights stay editable after download?

No. Flattened highlights become drawn rectangles in page content.

PDFNexus tool

Add highlights, sticky notes, and page comments. Exports flatten annotations into page content so they travel with the file.

Add highlights, sticky notes, and page comments, then flatten them into the PDF content.

Processed locally

Drop a PDF here or click to browse

Processed in your browser — files stay on this device

Mode: Flatten into content (Phase 2 — annotations become part of the page drawing).

Cancel finishes the current page, then stops (no mid-step abort).

Your file never leaves this device for this operation.

Upload the PDF you want to mark up.
Choose area or text highlight, sticky note, or page comment and add items on the active page.
Edit or delete items in the sidebar, then flatten into content and download.

This tool runs in your browser. Your file is not uploaded to process it.

Export mode is flatten-into-content only (not a separate editable annotation layer).
Text highlight selects glyphs inside a rectangle via the PDF text layer; scanned pages without text need OCR elsewhere.
Not a real-time collaboration or review workflow tool.

Can reviewers reply to comments?: No. This is a local markup tool. Comments are burned into the page on export.
Will highlights stay editable after download?: No. Flattened highlights become drawn rectangles in page content.