ConvertWarp

Merge PDF

Join PDF pages in the order shown. Password-protected PDFs are not supported.

PDF tools use pdf-lib (MIT).

About this tool

Merging concatenates pages from several PDFs into one file, in the order shown. Typical uses: attaching an ID behind a form, or combining chapter exports. Pages are copied, not rasterized, so text that was already selectable usually stays selectable.

Password-protected PDFs are refused. Unlock them first if you know the password. This is not a visual layout tool — overlapping letterheads will not be redesigned.

pdf-lib copies pages into a new document in the browser. 50 MB per file. Encrypted inputs are not opened. Outline trees and some optional metadata may not survive a copy.

How to merge PDFs

  1. Add two or more PDFs. They stay on your device.
  2. Drag the list if you need a different page order of files.
  3. Merge and download one PDF.

50 MB per PDF. Locked files are not supported. Very large page counts can still exhaust tab memory even under 50 MB.

FAQ

Do the PDFs get uploaded?
No. Pages are copied in this tab. ConvertWarp does not keep the packet.
Why was a file rejected as password-protected?
Encrypted PDFs need Unlock PDF with a password you are allowed to use. Merge will not guess it.
Are bookmarks kept?
Not reliably. Treat this as a page concatenate, not a full catalog merge.
Can I merge images?
Convert them with Image to PDF first, then merge, or use Image to PDF alone if they are only stills.
Will the file get smaller?
Usually larger (sum of pages). Compress PDF afterwards if you need a packed structure.

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