Can I use custom text for the watermark?

Yes. Type any text you want — common choices include DRAFT, CONFIDENTIAL, DO NOT COPY, or your company name. Latin, Chinese, Japanese, and Korean characters are all supported.

Can the watermark be removed later?

The watermark is drawn directly onto the PDF pages. It cannot be easily removed with standard PDF tools, which makes it effective for document protection.

What layout options are available?

Three layouts: Diagonal (angled across the center), Centered (horizontal in the middle), and Tiled (repeated in a grid pattern across the entire page).

Can I adjust the watermark transparency?

Yes. Use the opacity slider to make the watermark more or less visible. Lower values make it subtle; higher values make it more prominent.

Can I use an image as a watermark?

Currently the tool supports text-based watermarks. For image watermarks, you would need a desktop PDF editor.

Can I adjust the watermark opacity?

Yes. You can set the opacity from fully transparent to fully opaque, with 30-50% being the most common setting.

Will the watermark appear when printing?

Yes. The watermark is embedded directly in the PDF content and will appear in both digital viewing and printed copies.

Can I remove a watermark later?

Watermarks added by this tool become part of the page content. Keep your original unwatermarked file if you may need to remove it later.

Add Watermark

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Max 500.0 MB per file·Supports: PDF

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How PDF watermarking works

FileKit draws your watermark text on top of every existing page using a semi-transparent overlay. The original PDF content underneath is preserved exactly — fonts, images, form fields, and any other annotations stay intact. Diagonal layout rotates the text 45°, perfect for 'CONFIDENTIAL' or 'DRAFT' marks. Tiled layout repeats the text across the page in a grid for stronger discouragement of copying. All processing runs in your browser.

How to Add a Watermark to a PDF

1
Upload your PDF
Drag and drop the PDF you want to watermark. Processing happens entirely in your browser.
2
Set watermark text and style
Enter your watermark text (e.g. DRAFT, CONFIDENTIAL). Adjust font size, colour, opacity, and rotation angle to match your needs.
3
Apply and download
FileKit stamps the watermark across every page and generates a new PDF. Download the watermarked file — your original stays unchanged.

Frequently Asked Questions

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FileKit processes every file directly in your browser using JavaScript and WebAssembly. Your documents, images, and data never leave your device — there is no server upload, no cloud storage, and no account required. What happens in your browser stays in your browser.

100% client-side processing
No server upload — ever
No account or signup needed
Works offline after first load

Add Watermark

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How PDF watermarking works

How to Add a Watermark to a PDF

Upload your PDF

Set watermark text and style

Apply and download

Frequently Asked Questions

Your Privacy, Guaranteed

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