PDF Merging Guide
Complete guide to merging PDF files and best practices.
PDF Merger Online Free
Merge up to 20 PDFs · Drag to Reorder · Page Range · 100% Private
Drop PDF files here to merge
Upload 2–20 PDFs · Drag to reorder · Page range selection · 100% private
How to Merge PDF Files Online
1
Upload PDFs
Add up to 20 PDF files — drag & drop or click browse
2
Arrange & Configure
Drag to reorder, set page ranges, choose merge mode
3
Merge & Download
Click Merge and download your combined PDF instantly
Frequently Asked Questions
How many PDFs can I merge at once?
You can merge up to 20 PDF files in a single operation. All files are processed in your browser — no server upload required.
Can I choose which pages from each PDF to include?
Yes. Each file has a page range input. Enter ranges like "1-5", "1,3,7", or "2-4,8-10" to include only specific pages from that file in the merged output.
What is Interleave merge mode?
Interleave alternates pages from each file — Page 1 of File A, Page 1 of File B, Page 2 of File A, Page 2 of File B, and so on. This is useful for combining front and back scans of double-sided documents.
Can I merge password-protected PDFs?
Yes. When the tool detects a locked PDF, a password field appears for that file. Enter the password to unlock it for merging. The merged output will be unprotected.
Is the merged PDF quality the same as the original?
Yes. pdf-lib copies pages at full fidelity — no re-rendering, no compression, no quality loss. The merged PDF is identical in quality to the source files.
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