Merge PDF
On-deviceAdd files, drag to reorder, then merge — all on your device.
Drag & drop PDF files
Add at least 2 PDFs to merge. Files stay on your device.
Ctrl+OOn-device — never uploadedHow It Works
Select your PDFs
Upload two or more PDF files you want to combine. You can select multiple files at once or add them one by one.
Reorder files
Drag and drop the files in the list to arrange them in the exact order you want them to appear in the final document.
Merge instantly
Click the merge button. Your browser will instantly combine the documents into a single cohesive PDF file without losing quality.
Download safely
Save the merged PDF directly to your device. Since it never left your computer, there are no privacy concerns.
Why Use LocalPDF to Merge?
100% Browser-Based Privacy
Your sensitive documents are never uploaded to our servers. All merging happens locally using your device's memory.
Completely Free
We don't charge you for processing files, and we don't put features behind a paywall or require an account registration.
No Watermarks
Unlike other free tools, we will never brand or watermark your output files. Your documents remain entirely yours.
Works on Any Device
Whether you're using a laptop, tablet, or smartphone, our tool works seamlessly in any modern web browser.
Frequently Asked Questions
How many PDFs can I merge at once?
You can merge dozens of PDFs at once. Because the merging happens on your device rather than a remote server, the only limit is your device's memory. Most modern computers can easily merge 50+ files in one go.
Will merging PDFs change the quality or formatting?
No, merging PDFs with LocalPDF retains 100% of the original quality. We simply append the pages of one document to the end of another without altering the underlying images, text formatting, or metadata.
Can I reorder pages before merging?
Yes! After adding your PDF files, you can easily drag and drop the files in the list to change their order. The final merged PDF will combine the files in the exact sequence you arranged them.
Is it safe to merge confidential documents on LocalPDF?
Absolutely. LocalPDF is the safest way to merge confidential documents online because your files are never actually sent online. The merging process happens entirely locally within your web browser.
What file size limit applies when merging PDFs?
Our tool can handle files up to 500 MB. This is much larger than most cloud-based PDF tools because we don't have to worry about server storage or bandwidth costs. The processing uses your local device resources.
Can I merge PDFs on mobile devices?
Yes, LocalPDF works flawlessly on iOS and Android devices. You can select multiple PDFs from your phone's file system and merge them directly in your mobile browser without installing any apps.