Batch add watermarks to documents

To batch add watermarks to documents (e.g., PDFs, Word files), here are several methods depending on your platform and file types:

For PDF Files

1. Using Adobe Acrobat Pro (Paid)

• Open Adobe Acrobat Pro.

• Go to File > Action Wizard > New Action.

• Select Watermark > Add Watermark.

• Configure your watermark text/image and position.

• Add all files you want to process.

• Run the batch.

2. Using Free Tools (Windows/macOS/Linux)

PDFTK (Free Command-Line Tool)

bash
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pdftk input.pdf background watermark.pdf output output.pdf

You need a watermark.pdf with your watermark as a background.

Python Script (PyPDF2 or pypdf)

python
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from PyPDF2 import PdfReader, PdfWriter

watermark = PdfReader("watermark.pdf")
for filename in ["doc1.pdf", "doc2.pdf"]:
    reader = PdfReader(filename)
    writer = PdfWriter()
    for page in reader.pages:
        page.merge_page(watermark.pages[0])
        writer.add_page(page)
    with open(f"watermarked_{filename}", "wb") as f_out:
        writer.write(f_out)

For Word Documents (DOCX)

1. Microsoft Word (Batch via Macro)

You can use a VBA macro:

vba
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Sub BatchWatermark()
    Dim dlgOpen As FileDialog
    Dim doc As Document
    Set dlgOpen = Application.FileDialog(msoFileDialogFilePicker)

    With dlgOpen
        .AllowMultiSelect = True
        .Filters.Add "Word Documents", "*.docx", 1
        If .Show = -1 Then
            For Each file In .SelectedItems
                Set doc = Documents.Open(file)
                With doc.Sections(1).Headers(wdHeaderFooterPrimary)
                    .Range.Text = ""
                    .Shapes.AddTextEffect( _
                        PresetTextEffect:=msoTextEffect1, _
                        Text:="CONFIDENTIAL", _
                        FontName:="Arial", _
                        FontSize:=36, _
                        FontBold:=msoTrue, _
                        FontItalic:=msoFalse, _
                        Left:=100, Top:=100).Select
                End With
                doc.Save
                doc.Close
            Next
        End If
    End With
End Sub

Run this in the Word VBA Editor (Alt + F11).

2. Python with python-docx

This method only adds simple text watermarks, not headers/footers or diagonal watermarks.

python
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from docx import Document

def add_watermark(doc_path):
    doc = Document(doc_path)
    for section in doc.sections:
        header = section.header
        para = header.paragraphs[0]
        para.text = "CONFIDENTIAL"
    doc.save("watermarked_" + doc_path)

files = ["doc1.docx", "doc2.docx"]
for f in files:
    add_watermark(f)

Online Tools (Caution with Confidential Docs)

• PDF: ilovepdf.com

• DOCX: docx.tools

Let me know the OS or format you need help with if you’d like a ready-to-use script.