Image watermarks — logos, stamps, or ownership marks — add a visual identifier to every page of a PDF. PDFStream overlays your image watermark with adjustable opacity and position. Upload your watermark image (PNG with transparency works best), set the opacity and position, and apply to all pages. The original content shows through the semi-transparent overlay. Use cases: adding a company logo watermark to client-facing documents, overlaying a SAMPLE or VOID stamp on form templates, marking proof copies with a visual identifier, or asserting brand ownership on distributed content.

How-to

1
Upload File
Select your PDF.
2
Upload Image
Upload the logo or stamp image to be used as a watermark.
3
Adjust & Download
Adjust position and opacity, then download the PDF.

Frequently Asked Questions

What image formats can I use as a watermark?▼

You can use PNG (supports transparent backgrounds), JPG, or WebP.

Does a transparent PNG logo work well?▼

Yes, transparent background PNGs are inserted most naturally.

Is the image watermark feature free?▼

Yes, it is free.

Is the file saved on the server?▼

No, all processing is local.

Can I use it on mobile?▼

Yes.

Is the quality maintained?▼

Yes.

Is there a file size limit?▼

No.

How long does it take?▼

A few seconds.

Can I download the result multiple times?▼

Yes, in the same session.

What if an error occurs?▼

Retry if the file is corrupted.

Last updated: June 26, 2026

Image Watermark

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What is Image Watermark?

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