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Deckle
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Image Watermark PDF

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Add a logo or image watermark to PDF pages, with set width, position and transparency.

How to add an image watermark to a PDF

  1. Choose the PDF.
  2. Drop or choose one PNG or JPEG image in the Watermark image box.
  3. Choose All pages or a page range, then set the position, image width and opacity.
  4. Check the preview on a few pages.
  5. Press Add image watermark and download the copy.

Options

Stamp type
Image watermark is selected on this page. Switch to Text watermark to type the mark instead.
Watermark image
One PNG or JPEG. A transparent PNG keeps its transparency on the page. Remove image clears it so you can choose another.
Pages
All pages, or a list of pages and ranges such as 1, 3-5. A custom selection can hold up to 10,000 pages.
Placement
Top left, top, top right, centre, bottom left, bottom or bottom right. The default is centre.
Image width
5% to 80% of the page width, in steps of 5. The default is 25%. The image keeps its proportions.
Opacity
10% to 100% in steps of 10. The default is 25%.

What you get

  • One PDF named after the original with "(image watermarked)" added to the file name.
  • The image is drawn on top of each chosen page at the same size relative to that page's width.
  • Page count, order, size and rotation stay the same. Pages you did not choose are unchanged.

Limits

  • One PDF and one image at a time. A password-protected PDF must be unlocked first.
  • PNG and JPEG only. PNG files must be 8-bit, non-interlaced and not animated. SVG, GIF, WebP and HEIC are not accepted.
  • Very large images are refused when they exceed this device's file or pixel limit.
  • The image must fit inside every chosen page at the set width and position, or the button stays disabled.
  • There is no rotation, tiling or repeat-pattern option. The image appears once per page.
  • Adding the image rewrites the PDF, so existing digital signatures may stop validating.

Check the result

Open the saved copy and check the image on a portrait page, a landscape page and the last page. Zoom in to check the edges of a transparent PNG.

Questions

Can I use a transparent PNG logo?

Yes. The PNG's transparency is kept, so only the logo itself covers the page. Opacity then fades the whole image further.

Why was my PNG rejected?

Deckle accepts 8-bit PNGs that are not interlaced or animated. Re-save the logo as a standard PNG in an image editor, or use a JPEG.

Will the logo be the same size on every page?

The width is a share of each page's width. On mixed page sizes, the logo is larger on wider pages.

Can I put the logo behind the text?

No. The image is drawn on top of the page. Lower the opacity so the content underneath stays readable.

What width should a logo watermark be?

A centred watermark often works at 40% to 60% of the page width with low opacity. A corner logo usually needs 10% to 20%. The preview updates as you move the slider.

Can I watermark only some pages?

Yes. Choose Choose pages and enter pages or ranges, such as 1, 4-9. Pages you leave out are not changed.

Is my logo uploaded?

No. The PDF and the image are read in your browser and neither is uploaded.

Can I undo before saving?

Yes. Undo, Redo and Reset are above the options. Reset also removes the chosen image.

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