Arrange and merge your PDFs in any order with the fastest, most efficient online PDF combiner.
Select PDF files
or drop PDF here
Merge several PDFs into a single document online—free, fast, and optimized for performance. No watermarks, no size restrictions—quick, efficient merging.
Merge multiple PDF files and confidential
Works on Windows, macOS, Linux, and mobile for efficient, cross-device PDF optimization
No installation necessary and completely free
Easy Online PDF Combiner
Merge multiple PDF documents into one with a simple drag-and-drop. The process is free, secure, and private—built for optimized workflows.
Secure PDF Merging
All data is transmitted over TLS, protecting files during processing and securely purging them after completion.
Supports Windows, Mac, Linux, and Mobile for optimized PDF workflows.
Across Windows, macOS, Linux, or mobile, access our PDF merging tool optimized for performance. It’s free to use and built with strong security, enabling faster, lighter workflows.
Efficient PDF Optimization Preview – Merge Quickly with a Live Preview
During optimization-enabled merging, view a live preview to streamline ordering, remove pages, and insert optimized files for faster workflows.
Merge PDFs Reliably
No expensive software needed to merge PDFs. Our online tool is free, uses TLS-encrypted processing, and is designed for efficient handling of optimized PDFs.
Processing in the Cloud
No installation needed—PDF optimization is performed in the cloud. Regardless of device or OS, our cloud tool merges PDFs online with fast, efficient performance.
Frequently Asked Questions
Yes. This online Merge PDF tool is free and optimized for performance. You can combine multiple PDFs into one without registration, watermarks, or software installation. Some limits may apply based on file size or usage.
No installation is required. This cloud-based Merge PDF tool runs in your browser, delivering instant, optimized performance across major browsers and devices, including Windows, macOS, Android, and iOS.
Yes. As part of our PDF Optimization approach, your files are protected with secure HTTPS encryption during upload and processing. All uploaded PDFs are automatically deleted from our servers after a short retention window to ensure privacy and support faster, lighter PDF workflows.
How To Merge PDF Files Online:
A simple, free, step-by-step guide to perform PDF optimization through merging:
Drag and drop files into our optimizer-enabled PDF combiner
Arrange files as you wish
Rotate, remove, or add files to optimize the document structure
Click the Merge PDF button to produce a unified, optimized PDF and download it
Drop files here
Please unlock file
No file selected.
Add a file to enable optimization options
Merge PDF
Please add more PDFs by clicking 'Select PDF files' again to load additional documents for optimized merging.
Hold down 'Ctrl' (or Cmd on Mac) to select multiple files efficiently.
Drag and drop to reorder files before merging for a streamlined workflow.
Uploading file(s)
%
UPLOADED
Please wait a moment!
Oh no! We couldn't process your files.
Damaged/Corrupted File
We can't process damaged or corrupted files. Check if your file is damaged by opening it with your PDF software. If you can't open it, it's probably damaged. Restore the file to health, then try again.
Retry Repair PDF
Your PDFs have been merged!
Download merged PDF
Not satisfied? Click here to adjust optimization options and files
This file requires password
Ignore these files
wrong password
Some file(s) requires password
Damaged/Corrupted File
We cannot process corrupted or damaged PDFs. To verify integrity, open the file with any PDF reader; if it fails, restore the file before attempting the optimization pass.
Copy & Send download link
Copy
Reading file
Conversion failed. Please try again!
This is message zip error
merge
Operation failed, please try again!
Damaged/Corrupted File
This file is damaged. For reliable processing and optimal PDF workflows, please remove it.
This file is locked. For secure, efficient access and streamlined PDF handling, please unlock it.
Sorry, those file(s) are not allowed: {{ ignoredFiles }}
Sorry! PdfZu supports one file per task. The first file you selected will be processed. ({{ oneFileName }}) is being processed.
The link has been successfully copied.
Please enter a valid URL, such as: https://abc.com
Conversion failed. Please try again!
The data you entered is invalid. Please check again!
This file is locked. Unlock it to proceed with the optimized PDF workflow