Free tool

Annotate PDF Tool

Annotate PDF online for free — highlight, draw, box, and add text notes on any page. Private, no watermark, and local in your browser.

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Use next

Three related tools that fit this workflow — every one runs locally in your browser.

Everything you need in a free annotate PDF tool

Highlight, draw, and note

Mark up any PDF with highlights, freehand pen strokes, box outlines, and click-to-place text notes — then download the annotated file.

Page-by-page workspace

Browse thumbnails, jump between pages, undo marks, and clear a page or the whole document before you export.

Colors and stroke control

Pick highlight and ink colors, adjust pen or box thickness, and set text size so reviews stay readable.

100% browser-based

Annotation runs with PDF.js and pdf-lib in your browser. Your documents stay on your device — nothing is uploaded to Focera.

How It Works

Annotating a PDF should feel quick and private. Focera keeps the whole flow on one page — upload your file, mark it up visually, and download without an account or desktop installer.

  1. Upload your PDF. Drag and drop a file up to 25 MB (max 50 pages), or click the zone to browse from your device.
  2. Mark up the pages. Choose highlight, pen, box, or text, pick a color, and draw or click on the page preview.
  3. Download the annotated PDF. Marks are baked into the file locally. Preview the result and download again anytime.

Jump back to the annotate tool anytime to process another file.

Popular Use Cases

  • Document review — Highlight passages and leave short notes before sending feedback.
  • Study and research — Mark key lines in papers or handouts without printing.
  • Form callouts — Box fields or draw arrows-style marks so others know where to look.
  • Quick redlines — Circle issues and add a brief text note before a meeting.

Private by Design

Your PDF is read and annotated entirely in your browser. Focera does not receive the file, store pages, or process marks on a remote server. When you leave the page, temporary previews are revoked and nothing remains on our infrastructure.

Related Tools

  • Add Text to PDF — Stamp the same text on every page with position presets.
  • eSign PDF — Add a typed or drawn signature instead of review marks.
  • PDF Editor — Reorder, rotate, duplicate, or delete pages.
  • PDF Watermark — Stamp a logo or image across pages.
  • Merge PDF — Combine files before you annotate.
  • Compress PDF — Shrink the finished file for email and uploads.

FAQ

Is this annotate PDF tool free?

Yes. Annotate and download unlimited PDFs with no account, subscription, watermark, or daily limit.

Are my PDFs uploaded to a server?

No. Annotation runs entirely in your browser with PDF.js and pdf-lib. Your files stay on your device.

What annotation tools are included?

Highlight regions, draw freehand with a pen, outline areas with boxes, and place text notes by clicking on the page.

Can I annotate multiple pages?

Yes. Switch pages with the thumbnail strip, add marks on each page, then download one annotated PDF.

Can I undo or clear marks?

Yes. Undo the last mark, clear the current page, or clear every annotation before you export.

Is there a file size or page limit?

Yes. Upload PDFs up to 25 MB with a maximum of 50 pages per file.

Can I annotate password-protected PDFs?

Not directly. Unlock the file first with Unlock PDF, then upload the unlocked copy to annotate.

Do I need to install software?

No. Open the page in a modern browser, drop your PDF, mark it up, and download immediately.

Need more document utilities?

Add text to every page, sign a contract, or edit page order — Focera keeps everyday tools fast, private, and free.

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