When this tool is useful
Review comments, classroom markup, and visible callouts where the original page text does not need editing.
How local processing works
Drag on the real local page preview or enter exact normalized bounds. The browser draws each fixed-color highlight or text box directly onto the selected page and writes a new PDF.
How to use it
- Prepare Annotate a PDF: Work from a copy and confirm real page preview, page number, highlight or text type, normalized bounds, intrinsic rotation, basic-Latin note text, and recipient reader. Keep the source unchanged.
- Apply Annotate a PDF: Process locally in the browser. Drag on the real local page preview or enter exact normalized bounds. The browser draws each fixed-color highlight or text box directly onto the selected page and writes a new PDF.
- Download and verify: Save under a new name. Reopen in two common readers, inspect every marked page at 100%, and confirm each fixed visible highlight or note box appears in the intended bounds.
Important limitations
These are visible page drawings, not editable PDF annotation objects; colors are fixed, basic-Latin text only is supported, and existing PDF text is not rewritten.
Verify the downloaded result
Reopen in two common readers, inspect every marked page at 100%, and confirm each fixed visible highlight or note box appears in the intended bounds.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
When should I use Annotate a PDF?
Review comments, classroom markup, and visible callouts where the original page text does not need editing.
What does Annotate a PDF change?
Drag on the real local page preview or enter exact normalized bounds. The browser draws each fixed-color highlight or text box directly onto the selected page and writes a new PDF.
Which limits and settings matter?
real page preview, page number, highlight or text type, normalized bounds, intrinsic rotation, basic-Latin note text, and recipient reader. These are visible page drawings, not editable PDF annotation objects; colors are fixed, basic-Latin text only is supported, and existing PDF text is not rewritten.
How do I verify the result?
Reopen in two common readers, inspect every marked page at 100%, and confirm each fixed visible highlight or note box appears in the intended bounds.