PDF Merger — Combine PDF Files Online Free
Merge multiple PDF files into one document. Drag to reorder. Works 100% in your browser — files are never uploaded to any server.
Drop PDF files here or click to upload
Supports any number of PDF files • No file size limit
How to Merge PDF Files Online
Upload PDFs
Click or drag your PDF files into the upload area. Add as many as you need.
Reorder Files
Drag rows or use the arrows to arrange PDFs in the exact order you want.
Download
Click Merge & Download. Your combined PDF downloads instantly.
Our free PDF merger combines multiple PDF documents into a single file instantly. Everything runs inside your browser using PDF-lib — no files are ever uploaded to any server. Your documents stay 100% private on your device.
Works on all devices: Windows, Mac, iPhone, Android. No installation required, no account, no watermarks added to your PDF.
Features
Files Never Uploaded
Merging happens in your browser. Your PDFs never leave your device.
Drag to Reorder
Drag file rows to arrange them in any order before merging.
Unlimited Files
Add as many PDFs as you want. No file count limits.
Instant Download
Merged PDF downloads automatically as soon as processing finishes.
Completely Free
No hidden fees, no subscription, no watermark ever added.
Works on Mobile
Fully works on iPhone and Android browsers — no app needed.
Frequently Asked Questions
Is the PDF merger really free?
Yes, 100% free. No signup, no payment, no watermark. Unlimited use.
Are my PDF files safe and private?
Completely. Files are processed locally in your browser using JavaScript. Nothing is sent to any server. We never see your files.
Is there a file size limit?
There is no server limit since files stay on your device. Very large files (500MB+) depend on your device's available memory.
Can I merge password-protected PDFs?
The tool can attempt to merge password-protected PDFs if the security only restricts editing. PDFs requiring a password to open cannot be merged.
How many PDFs can I merge at once?
There is no limit on the number of files. You can merge 2, 10, or 50+ PDFs in one go.
Does the merged PDF have a watermark?
No. We never add any watermark or branding to your merged PDF.