Merge PDF Online Free
Combine multiple PDF files into one. 100% in your browser.
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Monthly users
200,000+
PDFs compressed
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Satisfaction
How merging PDF works with puduPdf
puduPdf combines multiple PDF files into a single document using the pdf-lib library directly in your browser. Your files are never uploaded to any server — processing is 100% local via JavaScript and Web Workers, ensuring total privacy.
How to merge PDF files for free
- 1
Upload your PDFs
Drag or select the PDF files you want to combine. You can add as many as you need.
- 2
Order the files
Rearrange the order of files in the list to define how they will appear in the final document.
- 3
Download the result
Click 'Merge' and download your combined PDF instantly. The process takes only seconds.
Key features
- Combine PDF files with no quantity or size limits (up to 100 MB per file)
- Page order is preserved exactly as you configure it in the list
- No quality loss: text, images, vectors and bookmarks remain intact
- Instant processing with no waiting queues or sign-up required
Frequently Asked Questions about Merging PDF
Everything you need to know about combining PDF files
Is it safe to merge my PDFs here?
Yes. puduPdf processes your files directly in your browser using pdf-lib and Web Workers. Your PDFs are never uploaded to any server. Unlike tools like iLovePDF or Smallpdf, there is no data transfer — processing is 100% local.
How many files can I merge?
There is no fixed limit on files. You can combine as many PDFs as you need, as long as each individual file does not exceed 100 MB. Performance depends on the available memory in your browser.
Is the original quality maintained?
Yes. When merging PDFs with puduPdf, pages are copied directly using PDFDocument.copyPages() from pdf-lib, preserving text, images, vectors, forms and bookmarks without any recompression or quality loss.
Can I change the order of files?
Yes. Before merging, you can reorder files by dragging them in the list. Pages will appear in the final PDF exactly in the order you define.