PDF Merger
PDF Merger loads multiple PDF files using pdf-lib and combines their pages into a single PDF in the order you specify. Use the up/down buttons to reorder files before merging. The merged PDF is generated entirely in the browser and downloaded directly.
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Frequently asked questions
Is there a limit on file count or size?
There is no hard limit, but very large PDFs may be slow to process depending on your device's memory, since all files must fit in the browser's available RAM simultaneously.
Does it preserve fonts and images?
Yes. pdf-lib copies pages with their full content including embedded fonts, images, vector graphics, and annotations — nothing is rasterized or re-rendered.
Can I change the order of pages within a single PDF?
This tool reorders whole files in the merge queue. To reorder individual pages within one PDF, use the PDF Splitter to extract pages first, then merge them back in the order you want.
Will merging reduce PDF quality?
No. Merging copies the original page content as-is, so there's no re-encoding, compression, or quality loss.
Are passwords or encryption preserved?
Password-protected PDFs cannot be merged directly — remove the password first using a PDF editor, then upload the unlocked file.
Can I merge PDFs with different page sizes?
Yes. Each page keeps its own original dimensions in the merged document; pages don't need to match in size or orientation.
What's a typical use case for merging PDFs?
Combining scanned documents, joining multiple invoices into one file for accounting, or assembling a report from separate chapter PDFs.