Merge PDF
Home

Organize

Merge PDF Split PDF Rotate PDF Reorder PDF Pages Delete PDF Pages Reverse PDF Pages Extract PDF Pages PDF N-up

Convert

JPG to PDF Word to PDF PDF to JPG Compress PDF PDF to Word Extract PDF Text PDF to PowerPoint PowerPoint to PDF Excel to PDF OCR PDF Extract Images from PDF

Secure & edit

Unlock PDF Protect PDF Add Watermark to PDF Sign PDF Remove PDF Metadata Crop PDF Add Page Numbers to PDF Grayscale PDF All 27 tools →

Guides

How to merge PDF How to compress PDF JPG to PDF tutorial All guides

Company

About Privacy Terms Contact

Language

Español Português Soon Merge PDF

Watermark PDF online free

Add a text or image watermark to your PDF — free, no signup. Files never uploaded

  1. 1 Add file
  2. 2 Set watermark
  3. 3 Apply & download

Drop a PDF here to watermark

or click to select — free, in your browser

PDF only · No account · Files stay on your device

How it works

How to watermark a PDF

Add a text or image/logo watermark to every page — free, no account. Choose Diagonal / Center / Bottom, opacity, size, and (for text) color for drafts, confidential copies, or branded stamps.

The same watermark applies to all pages in one pass. Tile with rows and columns inside page margins.

  1. Upload the PDF to Watermark PDF.
  2. Choose Text (e.g. DRAFT) or Image / logo (PNG, JPG, or WebP).
  3. Adjust position, rows/columns, page margins, opacity, and size, then check the sample layout preview.
  4. Click Add watermark and download the marked PDF.
Why browser processing & tips

Why process PDFs in your browser?

Most PDF sites upload your file to a remote server first. That adds wait time, queueing, and means your document passes through infrastructure you do not control. LokaPDF adds watermarks locally entirely in your browser — file content is not uploaded to our servers. Watermarks label copies — they are not legal copy protection. The tool works on Windows, Mac, Linux, iPhone, and Android with no install.

Review cycles, internal approvals, sample distributions, or logo stamps before final print.

Tips

  • Use a 3×3 grid with diagonal position for classic draft marks across the page.
  • Lower opacity keeps body text readable under the mark.
  • Prefer transparent PNG logos so the page shows through.

Related tools: Protect PDF · Merge PDF · Compress PDF · Split PDF

FAQ

Frequently asked questions

Is Watermark PDF free with no signup?

Yes. Add a text or image/logo watermark to every page free — no account required. Set position, opacity, and size before you download the marked PDF.

Can I watermark every page at once?

Yes. One watermark style applies to all pages in a single pass — ideal for DRAFT, CONFIDENTIAL, logos, or internal review copies before final release.

Can I use an image watermark?

Yes. Choose Image / logo and upload a PNG, JPG, or WebP (max 5 MB). Transparent PNG works best. Tile it with rows/columns like text watermarks. Text color options apply to text mode only.

Which characters are supported?

Text mode supports Latin letters and Chinese (Simplified) via an embedded font. Emoji and uncommon symbols are not supported — upload an image/logo instead.

What opacity should I use for draft watermarks?

Light is about 28% opacity, Medium about 45%, Heavy about 62%. Medium keeps body text readable under the mark; use Heavy for obvious DRAFT labels.

Does LokaPDF upload my file for Watermark PDF?

No. LokaPDF processes your PDF locally in the browser — file content is not sent to our servers. Your document stays on your device, including on public or work networks.