PDF Merger
files
pages merged
Merge PDF files into one file free online. Drag and drop to reorder pages; there is no set limit on file count or size. 100% private, files never leave your browser.
How to Merge PDFs
Upload PDF Files
Click the upload area or drag and drop PDF files. You can upload multiple files at once.
Reorder Files
Use the up/down arrows to arrange the PDFs in your desired order. Encrypted files can be unlocked with a password.
Merge
Click the merge button. All processing happens in your browser for privacy.
Download
Download the merged PDF file. All original pages are preserved in the order you arranged.
Tips & Tricks
Order Matters
Use the up and down arrows to arrange your PDFs in the correct order before merging. The final document will follow this sequence.
Combine Related Documents
Merge multiple chapters, reports, or invoices into a single PDF for easier sharing and archiving.
Privacy First
All processing happens locally in your browser. Your PDF files are never uploaded to any server, keeping sensitive documents secure.
Common Use Cases
Combine Reports
Merge monthly reports into a single document
Bundle Invoices
Combine multiple invoices into one PDF for clients
Assemble Contracts
Merge contract sections from different sources
Create Portfolios
Combine work samples into a portfolio PDF
Unify Presentations
Merge PowerPoint-exported PDFs into one presentation
Consolidate Scans
Merge scanned document PDFs into a single file
FAQ
Is my PDF data safe?
Yes. All processing is done entirely in your browser using JavaScript. Your PDF files never leave your device — no data is uploaded to any server.
What is the maximum number of PDFs I can merge?
There is no hard limit on the number of files or on their size. Merging runs entirely in your browser, so very large documents use more memory and take longer — if one big merge feels slow, do it in a few smaller batches.
What happens to bookmarks and annotations?
The merger combines page content from each PDF. Some interactive elements like bookmarks, form fields, and annotations may not be preserved in the merged output.
Can I reorder files after uploading?
Yes. Use the up and down arrow buttons next to each file to change the merge order. The final PDF will reflect the order shown in the list.
Does it work offline?
Once the page has been loaded, the PDF processing libraries are cached by your browser. You can merge PDFs offline as long as the necessary scripts are cached.
Guides
Longer write-ups on the things these tools deal with: file formats, size limits, and the algorithms behind them.
Local vs Server Processing
How browser-side file processing works, what uploading exposes, and two checks that reveal whether a tool sends your file anywhere.
How to Reduce PDF File Size
Why PDFs get large, lossless structural optimisation versus lossy image re-encoding, unshrinkable scans, signature warnings, and hitting upload limits.