pdf-lib copies pages from the selected files into a new PDF in order. Source files are not overwritten; the operation does not perform OCR or summarize content.
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Converters
PDF Merge
Opens up to 15 PDFs totaling 50 MB in browser memory and copies pages into a new document in visible file order. It never bypasses encryption, and existing digital signatures may no longer remain valid.
✓ Free✓ No account✓ In-browser
QUICK ANSWER
What does this tool do?
Merge multiple PDFs in your chosen order into one local PDF output.
APPLICATION AND DECISION GUIDE
PDF Merge: method and usage
Opens up to 15 PDFs totaling 50 MB in browser memory and copies pages into a new document in visible file order. It never bypasses encryption, and existing digital signatures may no longer remain valid.
Select local PDF files and arrange their order. Start with two small sample documents; encrypted or damaged files may not open. Confirm the shape first with a small example containing no personal data.
The result is a downloadable merged PDF. A two-page file A followed by a three-page file B should yield a five-page document in A→B order.
Practical steps
- Choose at least two PDFs totaling no more than 50 MB.
- Verify merge order with the up and down controls.
- Create the new PDF, verify page count and order, then download it.
Open the download in a PDF reader; check total pages, first and last pages, and the boundary between files. Test any forms or signatures separately.
Page copying does not guarantee preservation of digital signatures, bookmarks, or interactive forms. Large files may exhaust browser memory; retain originals.
Suitable use cases
- Combining report appendices
- Delivering ordered document sections
- Merging a set of scanned files
Worked decision record
Deliver an application form and its attachments as one correctly ordered PDF while keeping the source files on-device.
Choose two small, unencrypted PDFs: a two-page form followed by a one-page attachment. Confirm filenames and page order before merging.
The downloaded file opens with three pages; the form comes first, the attachment last, and all text and images remain visible.
If an encrypted, damaged, or interactive-form source raises a warning, keep the originals and do not deliver until every page is checked in the target viewer.
LEARN THE WORKFLOW
Guides for this tool
Create PDF from Images: Size, Order, and Readability Guide
Turn scans, receipts, and presentation images into one PDF with the right size and order.
Read guide →PDF Merge and Split: Privacy, Signatures, and Document Integrity
Handle encryption, digital signatures, forms, and authorization correctly when processing PDF pages locally.
Read guide →ABOUT THIS TOOL
Frequently asked questions
What input does PDF Merge accept?+
Select local PDF files and arrange their order. Start with two small sample documents; encrypted or damaged files may not open. Choose two small, unencrypted PDFs: a two-page form followed by a one-page attachment. Confirm filenames and page order before merging.
What does PDF Merge return?+
The result is a downloadable merged PDF. A two-page file A followed by a three-page file B should yield a five-page document in A→B order. The downloaded file opens with three pages; the form comes first, the attachment last, and all text and images remain visible.
How should I validate PDF Merge output?+
Open the download in a PDF reader; check total pages, first and last pages, and the boundary between files. Test any forms or signatures separately. If an encrypted, damaged, or interactive-form source raises a warning, keep the originals and do not deliver until every page is checked in the target viewer.
Does PDF Merge send or store input on a server?+
Tool input is processed in the active tab. Saving to the Workstation or transferring to another tool is a separate choice. Consider browser extensions and shared devices separately; the privacy page explains advertising and network connections.