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Annotate PDF pages in the browser

Add notes, highlights and graphical marks over a page while keeping the source PDF unchanged.

Annotations are added as editable objects over a page and saved only after the result is previewed.
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When this tool helps

Annotations are added as editable objects over a page and saved only after the result is previewed. The situations below show what this workflow is designed for so you can choose the tool before uploading a document.

  • Mark questions and important areas before discussing a document.
  • Add short explanations, highlights and graphical pointers to a finished page.
How it works

Annotate PDF online

The “Annotate PDF online” workflow consists of 3 consecutive stages. Review the settings and expected output at each stage because processing creates a new copy instead of overwriting the source.

  1. 01Upload file

    Upload the source PDF here.

  2. 02Choose settings

    Choose the settings and review the expected result before processing.

  3. 03Get the result

    Download a separate result without changing the source file.

What you can do

The capabilities below describe what is included in the workflow and the resulting file. Use them to confirm whether this tool completes the task or whether another processing stage will be needed.

  • Text notes
  • Highlights
  • Shapes and marks
  • Visual preview

Limits and important details

Limits keep the result predictable by describing supported files, processing boundaries and PDF properties that may require manual review. Read them before starting, especially for complex documents.

  • A separate output is created; the source PDF remains unchanged
  • PDFs are not stored in a permanent document library
  • An inactive guest session expires after 15 minutes
  • The hard session limit is 2 hours

Before you start

  • Keep the source file until the result has been reviewed
  • Check whether the PDF is password-protected or digitally signed
  • Identify the pages and objects that are expected to change
  • Use a non-sensitive test copy for an unfamiliar workflow

Result checklist

  • Open the downloaded copy in a second PDF viewer
  • Review every changed page at normal and enlarged zoom
  • Check text search, links, forms and visual quality where relevant
  • Confirm that confidential data and metadata meet the intended use
Example

Prepare a document for discussion

The “Prepare a document for discussion” scenario follows a source file through to a separate result. It shows which action is performed and what should be checked after download.

Input
A synthetic contract draft prepared for internal discussion.
Action
Highlight a key line, add a text note and point an arrow at the relevant area.
Result
A separate PDF containing visual marks without changing the source file.
Privacy

Temporary processing in Germany, EU

The file is processed only inside a temporary guest session. Access closes when the session ends, and source and result files follow the service deletion lifecycle.

  • No permanent document library
  • No external AI, OCR or PDF providers
  • 15-minute inactivity timeout
  • 2-hour hard session limit
FAQ

Questions and answers

These answers apply specifically to “Annotate PDF online” and extend the main instructions. They cover settings, expected output and the cases that most often need clarification before processing.

Which annotations can I add?

The editor supports text notes, highlights and common shape annotations.

How are annotations saved?

Annotations are exported into a separate PDF result after preview and preflight.

Can I change an annotation after adding it?

Yes. Every added object can be selected, moved, resized or removed before export.

Help center

Common errors and next steps

When processing cannot continue, the service shows a reason code and a safe next step. Resolve the stated issue and upload again or choose another mode; the source document remains unchanged.

FILE_TOO_LARGE

The source file is larger than the current upload limit.

Choose a PDF of up to 50 MB and upload it again.
PDF_PASSWORD_REQUIRED

The PDF is encrypted and cannot be processed without a known password.

Enter the document password in the password prompt, or choose another file.
Help center →
Help center

Useful guides

Practical guides provide context that does not fit into a short procedure: how to choose a mode, understand processing consequences and handle the document safely.

Four PDF text editing modesHow to preserve fonts and layout when editing a PDFHow to make a PDF accessible

Editorial and technical review: · next review:

Tools

Related tools continue the current workflow by preparing pages, changing content, checking security or converting the result into another format.

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→Available nowAdd an image to PDF online

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→Available nowCreate PDF forms online

Add interactive text fields, checkboxes and lists, then validate field names before exporting the PDF.

→