How to Use Merge PDFs
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1. Upload PDF Files
Click 'Add PDFs' or drag multiple PDF files onto the upload area. All selected files will be queued for merging.
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2. Reorder the Files
Drag and drop the file entries to set the order in which the PDFs will be merged.
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3. Merge and Download
Click 'Merge PDFs & Download' and the tool will combine all files into a single PDF and prompt you to save it.
The Technical Details
This interactive web utility provides fast, reliable, and completely private data transformations. In modern workflows, quick formatting, conversions, or estimations are essential. By running all logic entirely in your browser with client-side JavaScript, this tool guarantees that your data never leaves your machine. This approach delivers maximum performance and absolute data privacy, as no information is ever sent to a server.
Frequently Asked Questions
How many PDFs can I merge at once?
You can merge as many PDFs as you need. Processing time depends on the total number of pages and your device's memory.
Is page order preserved?
Yes. Pages within each PDF are preserved in order, and the PDFs are merged in the sequence you arrange them in the list.
Are my PDFs uploaded to a server?
No. All merging is done locally in your browser using pdf-lib. Your files never leave your device.
Can I merge password-protected PDFs?
Password-protected PDFs cannot be merged directly. Use the Unlock PDF tool first to remove the password, then merge the unlocked files.