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Annotate PDF Online

Add a visible highlight and optional note to a supported PDF page, review the marked area, and download a new annotated copy.

or drop one PDF here

Up to 50 MiB and 500 pages
View limits & supported files
Supported input
Select a PDF
Limits
Up to 50 MiB and 500 pages
Additional limits
Processing stays in this browser
Processing
No file upload
File handling
Files remain in your browser
Browser processing No account required Direct download
Practical guidance

Annotate a PDF with a visible highlight and note

Use Annotate PDF for a focused review mark rather than a complete document-editing workflow.

Highlight the area that needs attention

Place a fixed horizontal highlight band at the top, centre, or bottom of the selected page.

Add a short note when context is needed

Add optional visible note text inside the highlight band so the purpose of the mark is clear.

Understand the annotation scope

The tool adds one fixed highlight band and optional visible note to one page per job; it is not a text-selection or full commenting system.

About this tool

Add a focused visible mark without rewriting the page text

Annotate PDF adds a visible review mark and optional note to the output. It does not automatically rewrite the underlying PDF text.

Useful for

  • Draw attention to one section during review.
  • Add a short visible note inside the highlight band.
  • Create a simple annotated copy for sharing.

Good to know

  • One selected page can be annotated per job.
  • The highlight is a fixed full-width band, not a semantic text-selection annotation.
  • The tool creates a separate output copy and leaves the original source unchanged.

How to Annotate a PDF

Choose the PDF, select the page, place the supported highlight or mark, add a note when needed, and download the annotated copy.

  1. Choose a supported PDF.
  2. Select the page you want to annotate.
  3. Place the supported visible highlight or mark.
  4. Add the optional note or comment when available.
  5. Review the annotation and download the new PDF.
How to Annotate a PDF

Related PDF tools

Edit PDF

Add broader visible text, images, drawings, or shapes to PDF pages.

Sign PDF

Add a visible signature mark.

PDF Reader

Review the document without creating annotations.

Watermark PDF

Apply a consistent visible status label across pages.

Need a different browser task? Open the PDF reader.

PDF annotation questions

Can I highlight PDF content?

Yes. Add a fixed horizontal band at the top, centre, or bottom of one selected page. It does not select underlying text.

Can I add a note with the highlight?

Yes. The optional note is drawn as visible text inside the highlight band.

Can I select individual words to highlight?

No. The tool does not select individual words; it draws a horizontal highlight band.

Can I annotate more than one page?

No. The current tool annotates one selected page per job.

Does annotation change the original PDF?

No. The tool creates a separate annotated PDF and leaves the original source unchanged.

Are my files uploaded?

No. Selected PDF contents are processed locally in this browser.

Practical PDF guides for complete tasks

Annotate PDF guide How to Add a Visible Note to One PDF Page PDFKaka Annotate PDF can place one fixed horizontal highlight band and an optional visible note on one selected page per job. Read guide → Annotate PDF guide PDF annotation versus editing existing text Use annotation to mark and comment on content; use additive editing to place new text, while neither workflow rewrites existing text in the current tools. Read guide → Annotate PDF guide How to Mark One PDF Page on a Phone or Tablet On a phone or tablet, choose the PDF from device storage, select one page, position the horizontal highlight band, add an optional visible note, and download the new copy. Read guide →
View all PDFKaka Guides →