ประทับตรา PDF

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This draws every page of one document onto the corresponding page of another. Unlike merging, which puts documents next to each other, this puts them on top of each other.

Use it to apply a letterhead or a branded background to a plain document, to stamp a DRAFT or CONFIDENTIAL overlay that you designed elsewhere, or to place content onto a pre-designed form so it prints as one piece.

วิธีทำงาน

1. Drop both PDFs onto this page.
2. Say which of the two is the stamp - by default it is the second one.
3. Choose whether the stamp goes over the content or behind it. A letterhead usually goes behind; a DRAFT mark goes over.
4. Set the fit and the opacity, then press Stamp.
5. The download starts immediately.

Over and behind work differently under the surface, and the difference costs something worth knowing about. Drawing over adds to the existing page, so links, form fields and annotations on the base document survive. Drawing behind cannot be done that way - a PDF content stream can only be appended to - so the result is composed onto fresh pages instead, and the base document's annotations do not carry across. If your document has fillable fields you want to keep, stamp over rather than behind.

When the stamp has fewer pages than the base, repeat decides what happens. Repeat the last page suits a letterhead whose second page differs from its first. Cycle suits an alternating left-right design. Stop leaves later pages unstamped.

Fit controls scaling. Contain keeps the stamp's proportions and centres it, which is right for a logo. Stretch fills the page exactly, which is right for a full-page background designed at a different size. None places it at its original size.

Opacity below one is how you turn a solid design into a background that text stays readable over. For a plain text or diagonal watermark, Add watermark is a more direct tool than building a stamp file first.