Merge PDF Files
Combine multiple PDFs into one file. Reorder pages before merging. Runs entirely in your browser.
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Add PDF Files
Why Use This Tool?
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💡 Tips
- • Add files one at a time or all at once
- • Use ↑ ↓ arrows to reorder before merging
- • Password-protected PDFs will fail to merge
- • Very large PDFs (>50MB) may be slow
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How to Merge PDF Files Online
Merging PDFs combines multiple documents into a single file — useful for consolidating reports, invoices, contracts, or any set of related documents. This tool uses pdf-lib, an open-source library, to perform all merging directly in your browser. Nothing is uploaded to a server.
Step-by-Step Instructions
- Click the upload area or drag and drop your PDF files. You can select multiple files at once.
- Use the ↑ and ↓ arrows to set the order in which PDFs will appear in the merged file.
- Click Merge to combine all files into one PDF.
- Click Download Merged PDF to save the result.
Frequently Asked Questions
Is my PDF uploaded to a server?
No. All merging is handled by pdf-lib entirely in your browser. Your files never leave your device, making this safe for confidential documents.
How many PDFs can I merge?
There is no hard limit imposed by the tool. For very large files (100 MB+) processing happens in browser memory, so performance depends on your device.
Can I reorder the files before merging?
Yes. Use the up and down arrows next to each file entry to rearrange the order. The merged PDF will follow the list order from top to bottom.
Related Tools
Compress PDF — reduce file size after merging. PDF to JPG — convert pages to images. JPG to PDF — build a PDF from images.