How to Merge PDF Files Online for Free
Need to combine several PDF documents into a single file? Whether you're merging invoices, report chapters, scanned documents, or contract pages, our free PDF Merger does it instantly — without uploading anything to a server.
- Add your PDF files: Drag and drop one or more PDF files into the drop area, or click to browse your device.
- Arrange the order: Your files appear in a list. They'll be merged in the order shown.
- Click "Merge PDFs": The tool combines all files into a single PDF and automatically downloads it to your device.
Why Choose Our Browser-Based PDF Merger?
- 100% Private: Your PDF files never leave your device. We use PDF-lib (a JavaScript library) to process everything locally in your browser.
- No File Size Limits: Unlike server-based tools that limit file sizes, our tool is only limited by your device's memory.
- Preserves Quality: Text, images, fonts, and formatting are preserved exactly as they appear in the original files.
- No Watermarks: The merged PDF is clean — no watermarks, no branding, no modifications.
More PDF tools: PDF Splitter, PDF Compressor, PDF to Images.
Frequently Asked Questions
Are my PDF files sent to any server?
No. All merging happens locally in your browser using PDF-lib. Nothing is ever uploaded to any server. Your documents remain completely private.
How many PDFs can I merge at once?
You can merge as many PDFs as your device's memory allows. Most modern browsers handle 10–20 large PDFs without issues.
Will the merged PDF preserve formatting?
Yes. Text, images, fonts, and formatting are preserved exactly as they appear in the original files.
Can I merge password-protected PDFs?
Password-protected PDFs cannot be merged unless you remove the password first. The tool will show an error if it encounters a protected file.