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PDF · Local utility

Add a Watermark to PDF

Add text or a PNG/JPEG watermark to selected PDF pages. Adjust opacity and use centered or tiled marks, locally in your browser.

Task path / input to outcome

Choose one PDF

Runs locally · Nothing is uploaded

Add Latin, Russian or CJK text and PNG/JPEG watermarks to a PDF locally. Missing glyphs and emoji are refused.

How Add a Watermark to PDF works, privacy, and related tools

Task path / input to outcome

How to add a watermark to a PDF

  1. 01

    Choose one PDF

    Select Choose one PDF and open a document of up to 30 MiB with at most 500 pages. The file opens inside this tab; nothing is uploaded, and neither is the watermark image you add later.

  2. 02

    Pick the watermark type

    Choose Text for a short phrase or Image for a PNG/JPEG logo. Text fonts load from this site only when needed; choose the appropriate CJK letterforms for Chinese, Japanese or Korean. Your document and watermark stay in the browser.

  3. 03

    Design the mark

    For text, enter the phrase in Watermark text and set the Font size to 24, 36, 48, 64 or 96 (default 48) and the Rotation, which offers 0, 30, 45, 90, 180, 270, and 315 degrees. For an image, use Choose a PNG or JPEG image (up to 20 MiB) and set its Scale as a share of the page width from 5% to 100% (default 25%). Both kinds take an Opacity from 5% to 100% (default 35%).

  4. 04

    Choose the layout and pages

    Choose Centered for one mark per page or Tiled for a repeating pattern. Apply to all pages, or select page numbers and ranges such as 2-6 to skip the cover of a six-page PDF. Repeated page numbers are stamped once; unselected pages receive no watermark.

  5. 05

    Apply and download

    Press Apply watermark and save the stamped document from the result panel, which reports how many pages were watermarked and with which kind of mark. The download keeps your file name with -watermarked appended, and the original on disk is never modified.

Tool facts

Processing
In your browser
Input leaves this device
Never
Retention
Nothing is stored
Price
Free

Your input stays in the browser.

Add a Watermark to PDF uses its verified local execution path and does not create a hidden input or output history.

Local execution

Runs inside the current browser tab.

No hidden processing

Active tool data never becomes a Toolars document record.

No account required

Use the core workflow without creating a profile. Favorites sync to your account after you sign in.

Immediate reset

Clear the tab and the active working data is gone.

When Add a Watermark to PDF is useful

Mark every page as confidential

Choose Text, enter Confidential, keep All pages and use Centered. Apply, download and open the PDF to inspect the result.

Leave the cover unmarked

For a six-page PDF, choose Selected pages and enter 2-6. Only those five pages receive the watermark.

Repeat a logo across pages

Choose Image, load a PNG or JPEG logo and select Tiled. Adjust scale and opacity, then download and inspect the PDF.

What Add a Watermark to PDF actually does

Use a Draft, Confidential, or logo watermark as a visible cue for reviewers. Choose the pages, opacity, and centered or tiled layout, then download and inspect the PDF. A watermark does not control access, stop copying or editing, or prove who created a document. The PDF and any logo image are processed in the browser. Example input: Draft or Confidential.

Common questions

Why does my watermark text get rejected?
Supports Latin, Russian and CJK text, up to 100 characters on one line. CJK letterforms follow this selection. Fonts download from this site only when needed (CJK: about 11 MB); only used glyphs are embedded. Your PDF and text stay local. Emoji and unsupported combining sequences are refused.
What image can I use as a watermark?
A PNG or JPEG file up to 20 MiB, verified by its magic bytes before the engine loads. Its scale is set as a share of the page width, from 5% to 100%, the aspect ratio is preserved, and Opacity runs from 5% to 100%, same as for text. A PNG with a transparent background usually sits best over page content.
How does the Tiled layout space the marks?
The grid starts at the bottom-left corner of each page and each cell is twice the size of the mark's rotated footprint, so marks repeat with a full mark's width of breathing room between them and bleed past the top and right edges — the look reviewers expect from a tiled watermark. Centered places exactly one mark in the middle of the page instead.
What are the document limits?
One PDF up to 30 MiB and 500 pages. Page numbers start at 1. Unselected pages receive no watermark, but saving rewrites the PDF; byte-identical output is not promised. There is no page preview: download and open the result to inspect it. A watermark does not prevent copying or editing.
Is the file uploaded anywhere?
No. Stamping runs fully inside the current browser tab, no account is required, and resetting or closing the workspace discards the loaded document and the watermark image.

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