Skip to main content
UFOZoo

Add Watermark to PDF Online: Text & Logo Watermark

PDF watermark online: stamp text or a PNG logo with size, color, and opacity control. Diagonal, centered, or grid tiling, on all pages or a range.

Updated 2026-08-16

Related Tools

Add Page Numbers to PDF Online: Start Numbering Any Page

Rotate PDF Pages Online: 90° Clockwise or 180° Flip

Sign PDF Online: Add Handwritten Signature to Documents

Merge PDF Files: Combine Multiple PDFs into One Online

Compress PDF Online: Reduce File Size for Email & Sharing

Image to PDF Converter: JPG, PNG & HEIC to PDF Online

Features

  • Add a text watermark (company name, status label, or any Latin text) with font size, color, rotation, and opacity control
  • Stamp a PNG logo as an image watermark; transparency is preserved and the scale is adjustable
  • Diagonal watermark mode tiles text along 45° or -45° bands across the page: the classic CONFIDENTIAL look
  • Or place a single watermark centered, or fill the page with a repeated grid
  • Apply the watermark to all pages or only a range, for example pages 2 to 5
  • Live thumbnail preview updates instantly as you change any setting
  • Copyright protection: watermark photos, artwork, and portfolios with your name or logo before publishing them
  • Stamp contracts and internal drafts with client names or CONFIDENTIAL before sharing
  • The watermark is part of the page content, so it prints and converts together with the document, not just on screen
  • Standard PDF output: original fonts, images, and layout are preserved; a text watermark adds almost nothing to the file size

How to Use

  1. 1Drag the PDF onto the tool or click the drop area to open it.
  2. 2Choose Text watermark or Image watermark.
  3. 3For text: type the content, then set font size, color, rotation, and opacity.
  4. 4For images: open a transparent PNG logo and adjust its scale, opacity, and placement.
  5. 5Pick the position mode: diagonal tiling, centered, or grid fill.
  6. 6Choose all pages or a page range such as pages 2 to 5.
  7. 7Check the live preview on the thumbnail; it follows every setting change.
  8. 8Click Apply watermark, then Save PDF.
  9. 9Protect a photo portfolio: stamp a semi-transparent logo in a corner of each page before sharing.
  10. 10Mark a contract: tile your company name diagonally across every page before sending.

Frequently Asked Questions

How do I add a watermark to a PDF?

Open the PDF in the tool, type your watermark text or open a PNG logo, choose placement and style, then click Apply watermark and Save PDF. The watermarked file is ready in seconds.

Will the watermark show when the PDF is printed?

Yes. The watermark is drawn into the page content itself as vector text, not an on-screen overlay, so it prints exactly as it looks in the preview and also appears when the PDF is exported or converted. If you do not want it on a printed copy, do not add it to the file.

Does adding a watermark increase the file size?

A text watermark adds a negligible amount: a few hundred bytes for the text and its style. An image watermark adds roughly the size of that image (a PNG logo is typically 10-200 KB). In both cases the original pages are not recompressed.

How do I make a diagonal watermark?

Select the diagonal tiling mode and a 45° or -45° rotation. The text repeats along diagonal bands across the page: the classic look for CONFIDENTIAL stamps and name marks.

Can I use a watermark for copyright protection?

Yes. Stamp photos, artwork, and portfolios with your name or a semi-transparent logo before publishing, and mark contracts with your company name. A visible watermark deters casual reuse and makes the source clear; note that it does not stop a determined person from cropping or removing it.

How do I add a watermark in Adobe Acrobat?

In Adobe Acrobat Pro: open the file, then Tools > Edit PDF > Watermark > Add. You can type text, adjust size/opacity/rotation, and choose the page range. Two honest caveats: the free Acrobat Reader has no Edit PDF tools, so it cannot add watermarks at all, and Acrobat Pro requires a paid subscription. This tool does the same job in any browser with the same output format.

Can I add a watermark on a Mac with Preview?

No, Preview has no watermark feature. Its text tool only places annotation overlays that do not become part of the page content: they vanish when the file is printed from another app or converted, and they do not export with the PDF. For a real watermark baked into the document on macOS, use Adobe Acrobat Pro or a browser tool like this one, which runs identically on a Mac.

Can I add a Chinese or non-Latin watermark?

The built-in text font covers Latin characters only. For Chinese or other scripts, create the text as a transparent PNG image and use the image watermark mode; the result looks the same and keeps any font you like.

Can I watermark only some pages?

Yes. Switch from all pages to a page range and enter the start and end pages (for example, 2-5), useful for cover pages, appendices, or only the pages you send to outsiders.

Does the tool add its own watermark?

No. The output contains only the watermark you configured; no tool branding, footer, or stamp of its own.

Can I remove a watermark from a PDF?

This tool only adds watermarks. Removing a watermark requires the original file or dedicated editing software, and if the watermark belongs to someone else, removing it means stripping their copyright mark, which is not appropriate. Ask the author for a clean copy instead.

Will the watermark cover the text in my PDF?

You control opacity from 10% to 100%. At low opacity the watermark sits in the background and the document stays readable; at 100% it covers the content. Pick the lowest opacity that still marks the document.

Does it work on a phone?

Yes, the tool is fully responsive. On a phone or tablet, open the PDF from the Files app or downloads folder, adjust the watermark, and save the result; everything happens on the device.

Why can't I watermark a password-protected PDF?

Encrypted PDFs cannot be opened by the tool. Unlock the document in a PDF reader first (the decrypt tool on this site can do it if you have the password), then add the watermark to the unlocked copy. The watermark will not carry over to any re-encrypted version you make later.

Why can I add watermark to pdf online without uploading my file to a server?

Most add watermark to pdf online services upload your PDF, process it on their servers, and monetize with watermarks, limits, or subscriptions. This tool renders the watermark in your browser instead of uploading, so there is no file transfer step at all. The trade-off is that very large files are bounded by your device's memory.

Why is my watermark too light after printing?

Watermarks are usually rendered at low opacity (roughly 10-25%) so they do not obscure the document on screen, and printers reproduce light grays even fainter, sometimes nearly invisible on laser printers. If the printed watermark matters, raise the opacity to 40-60% or use a darker color where your tool allows it, and test-print one page before the whole document.