# PDF Image Stamp

Place a logo, seal or stamp image on the pages of a PDF. Upload the PDF first and a PNG or JPEG second, then pick one of nine positions, the image width as a share of the page, the opacity and the margin, and stamp all pages or only some. The image is embedded once and reused on every page, so the file stays small. Good for branding, approval stamps and letterheads.

## Frequently asked questions

### In which order do I upload the files?

Upload exactly two files: the PDF first and the image second. The first file must be a PDF and the second a PNG or JPEG image. Any other order or number of files is refused with a message.

### Which image formats are supported?

PNG and JPEG, up to 5 MiB and 4000 pixels a side. PNG transparency is kept, so a logo with a transparent background sits cleanly on the page. JPEG photos with an orientation tag are turned upright, and CMYK JPEGs are converted to RGB.

### How is the image size set?

The width field sets the image width as a percentage of the visible page width, from 1 to 100 percent, and the height follows the aspect ratio of the image. If the image would be wider or taller than the page minus its margins, it is scaled down to fit. Pages of different sizes get proportionally sized stamps.

### Which positions are available?

Top left, top, top right, left, center, right, bottom left, bottom and bottom right. The margin, from 0 to 500 points, keeps the image away from the page edge, and 72 points make one inch. Positions follow the page as it appears in a viewer, including rotated pages.

### Can I make the stamp semi transparent?

Yes. Opacity runs from 1 to 100 percent and applies to the whole image on top of its own transparency. A value of about 20 to 40 percent turns a logo into a background watermark.

### Can I stamp only selected pages?

Enter pages such as 1, 2-4 or 3- in the pages field, and leave it empty to stamp every page. The same image object is reused on each page, so stamping 200 pages adds the image data only once.

### Is the image placed above or below the page content?

Above. It is drawn after the existing content of each page, so an opaque image covers what lies beneath it. Use a transparent PNG or a lower opacity when the text underneath must stay readable.

### Will the image lose quality?

No resampling happens. PNG pixels are embedded losslessly and JPEG data is embedded as it is, unless the photo has to be turned upright or converted from CMYK. The stamp prints at the full resolution of the original file.

### Does it work with password protected PDFs?

Enter the password of a protected PDF in the password field. The stamped result is saved without the password, so protect it again if you need to. The password is not stored or returned.

### What are the limits?

The PDF can be up to 10 MiB and 200 pages, the image up to 5 MiB and 4000 by 4000 pixels, and the result up to 32 MiB. Processing runs for at most 30 seconds, and links, form fields and bookmarks are kept.

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