DocuMerger
Put your letterhead, stationery or form behind or on top of the pages of a PDF, and see exactly how it will look before you apply it.
Last updated September 2026
Ready now. DocuMerger runs with Acrobat’s Protected Mode switched on, so you no longer need to disable it. The rest of the Mapsoft plug-ins follow over the coming weeks. Adobe removes the option to turn it off in December 2026 — what this means for your plug-ins.
Browse our free online tools. Mapsoft's PDF Hub offers 55+ free PDF tools in your browser — no installation required. The DocuMerger plug-in below merges a page of one PDF onto another inside Acrobat, which the online tools do not cover.
Overview
DocuMerger is an Adobe Acrobat plug-in that merges a page from another PDF onto the pages of the document you have open. Place it behind the existing content as a watermark — ideal for printing onto a letterhead or pre-printed stationery — or on top of it as an overlay for stamps, form layouts and approval marks.
A live preview shows the result on your own pages before anything changes, and the merged page is stored in the file once and shared by every page it appears on, so documents stay small.
Key Features
Everything you need to place one PDF page onto another.
Watermark or Overlay
Place the merged page behind the existing content, like pre-printed stationery, or on top of it, like a stamp.
Live Preview
See your own pages with the merged page in place, and step through them, before anything in the document changes.
Fit & Position
Keep the original position, fit the page to the target, or center it at actual size. It is turned to read upright on rotated pages.
Opacity
Make the merged content partly transparent, from 1 to 100 per cent, so an overlay never hides the text beneath it.
Page Ranges
Merge onto every page, a range such as 1,3-5, or just the odd or even pages.
Saved Configurations
Save your settings under a name and reuse them, or run them from a batch sequence to process many files.
Use Cases
DocuMerger is ideal wherever the same page belongs on many others.
Letterheads & Stationery
Put your company letterhead behind letters, invoices and reports, so digital copies match what you would print on headed paper.
Forms & Templates
Combine the fixed layout of a form with the pages that fill it in, or lay a grid or template over technical drawings.
Stamps & Approval Marks
Overlay an approval block, a confidentiality notice or a revision stamp on every page of a document.
Archiving
Create faithful digital archives of documents that were normally printed onto pre-printed stationery.
System Requirements
Adobe Acrobat
Adobe Acrobat Pro or Standard (DC, 2020, or 2017). Not compatible with Adobe Acrobat Reader.
Operating System
Windows 10 or Windows 11 (64-bit recommended). Both 32-bit and 64-bit Acrobat installations are supported.
License
Free to use. No license or activation required.
Frequently Asked Questions
How do I put my letterhead on a PDF?
Open the PDF in Adobe Acrobat, choose DocuMerger from the Mapsoft plug-ins menu, pick the PDF that holds your letterhead and choose Watermark. The letterhead is placed behind the existing content on every page you select.
Can I see the result before merging?
Yes. DocuMerger shows a live preview of your own pages with the merged page in place, including its position and opacity, and changes nothing until you click OK.
Is DocuMerger free?
Yes. DocuMerger is a free Adobe Acrobat plug-in for Windows. No license or activation is required.
Related Products
Impress
Stamp text, dates and page numbers onto PDF pages, alongside the letterheads and forms you merge with DocuMerger.
“User friendly, efficient, and will save days of work on our projects.”
Willem Goovaerts — Industrial Pharmacist
Need Something More?
If this product doesn't quite meet your requirements, we can help. With over 30 years of Adobe development expertise, our team can modify existing products or build entirely custom solutions tailored to your specific workflow. Whether you need additional features, integration with your systems, or a completely bespoke tool, get in touch to discuss your needs.
We also welcome suggestions for new features and new product ideas. If we hear enough requests for a particular capability, it moves up our development priority list — so your feedback directly shapes what we build next.
Beyond off-the-shelf plug-ins, we also build enterprise PDF solutions on the Adobe PDF Library — server-side document processing, generation, validation, conversion and redaction pipelines for high-volume environments. If your need is bigger than a desktop tool, our PDF Library team can build it.