Put your PDFs in the right order
Add two or more PDF files and arrange them exactly how you want them. Move files up or down, remove individual documents or clear the list and start again.
BLACKBOX UTILITIES / PDF MERGER
Merge PDFs on Windows.
Keep your files on your computer.
Blackbox PDF Merger is a simple PDF merger for Windows that lets you combine multiple PDF files into one document. Add your PDFs, arrange them in the order you want, preview each document and, if needed, set a maximum output size before saving the finished file.
Get PDF Merger · €5.99One-time purchase · Windows application
INSIDE BLACKBOX PDF MERGER01 / 01
Blackbox PDF Merger with file ordering, document preview and output controls
MERGE, CHECK AND SAVE
An offline PDF merger with no upload required.
Merge PDF files locally on your Windows computer without sending your documents to an online PDF service. Your files stay on your computer throughout the merge process.
Preview PDFs before you merge
Select any PDF to preview it inside the app before creating your combined document. Once everything looks right, choose where you want the merged PDF to be saved.
Check your document totals
See how many PDF files you've added, the total number of pages and their combined file size before you merge them.
Need to keep the PDF under a size limit?
Set a maximum output size when you need to upload your PDF to a website or service with a file-size limit. Blackbox PDF Merger will try to reduce the finished PDF while keeping it readable. If the size you've chosen is too small to achieve, the app will let you know.
ONE-TIME WINDOWS PURCHASE
€5.99. No subscription.
Buy Blackbox PDF Merger once and use it without a subscription or recurring fee.
After purchase, you can download the latest Windows installer directly from the Downloads section of your Blackbox customer account.
Choose Blackbox PDF MergerMerge multiple PDF files into one
Reorder PDFs before merging
Preview PDFs before saving
See page count and combined file size
Set an optional maximum PDF file size
Process PDFs locally on your Windows computer
No online PDF upload required
One-time purchase, no subscription
BEFORE YOU INSTALL
The current Windows installer is unsigned.
Windows may display an Unknown Publisher warning when you install Blackbox PDF Merger.
Only download the installer from your official Blackbox customer account and check that the product name and version match the version listed there.
If you use the output-size option, PDF Merger may need to rebuild pages as smaller images to reach your chosen file size. This can remove searchable text, links, forms and accessibility information.
Always check the finished PDF before uploading or sharing it.
QUICK ANSWERS
Using Blackbox PDF Merger
Are my PDFs uploaded anywhere?
No. Blackbox PDF Merger works locally on your Windows computer. Your PDFs are not uploaded to Blackbox as part of the merge or size-reduction process.
Can I change the order of PDFs before merging them?
Yes. Add your PDF files, arrange them in whatever order you want and preview them before creating the combined PDF.
Can I merge multiple PDF files into one?
Yes. Blackbox PDF Merger lets you combine multiple PDFs into a single PDF file on Windows.
Can I set a maximum PDF file size?
Yes. You can choose a target output size before merging. This is useful when you need to upload a PDF to a website with a maximum file-size limit.
Does reducing the PDF size keep searchable text?
Not always. If the original merged PDF is too large, the app may rebuild pages as smaller images to reach your target size. This can remove searchable text, links, forms and accessibility information.
Do I need an internet connection to merge PDFs?
No. PDF merging and optional size reduction happen locally on your computer.
Where do I download PDF Merger after purchasing it?
Sign in to your Blackbox customer account after purchase. The latest Windows installer will be available in the Downloads section.
BLACKBOX PDF MERGER
Merge PDF files on Windows without uploading them.
Get PDF MergerCombine, reorder and preview your PDFs locally with Blackbox PDF Merger.
One-time Windows purchase · €5.99