Merge PDF Files
Combine multiple PDF files into one — reorder them, then download the merged result instantly. No upload required.
✓ Free · No signup · Works in browser · 100% private
Add PDF files to merge
Drag multiple PDFs here or click to browse · Files processed locally
Why use this tool
Fast, Private PDF Merger
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Unlimited Files
Add as many PDFs as you need. No artificial limits on the number of files you can combine.
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Reorder Before Merging
Move files up or down in the list to control the exact order of pages in the merged PDF.
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Lossless Quality
Pages are copied without re-encoding — original quality, fonts, and images are fully preserved.
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100% Private
Processing happens in your browser using pdf-lib. Your PDFs never leave your device.
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Instant Download
The merged PDF downloads automatically as soon as processing is complete — no waiting.
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Completely Free
No subscription, no signup, no watermarks. Merge PDFs as many times as you need.
How it works
Merge PDFs in 3 Simple Steps
1
Add your PDF files
Drag and drop multiple PDFs into the drop zone, or click to browse and select multiple files at once.
2
Reorder the files
Use the ↑ and ↓ buttons to arrange the PDFs in the desired order. Add more files using the "+ Add more" button.
3
Merge & download
Click "Merge PDFs & Download". The combined PDF downloads automatically with all pages in order.
FAQ
Frequently Asked Questions
How many PDF files can I merge at once?
You can merge as many PDFs as your browser's memory allows. For typical use, merging 2–20 files works smoothly. Very large PDFs (100+ pages each) may require a few seconds to process. There is no hard limit on the number of files.
Can I reorder the PDF files before merging?
Yes! Each file in the list has Move Up (↑) and Move Down (↓) buttons to change the order. Files are merged top-to-bottom in the order shown in the list. You can also remove individual files using the ✕ Remove button.
Is my PDF uploaded to any server?
No. All PDF processing uses the pdf-lib JavaScript library running entirely in your browser. Your files never leave your device and are never uploaded to our servers — completely private processing.
Can I merge password-protected PDFs?
Password-protected PDFs cannot be merged without being decrypted first. If you encounter an error for a protected PDF, use a PDF Decryption tool to remove the password first, then add the decrypted version to the merger.
Will merging preserve the original PDF quality?
Yes. This tool copies all pages from source PDFs to the output document without re-encoding or compressing the content. The merged PDF preserves the original quality, embedded fonts, vector graphics, and images at full fidelity.
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