Is there a page or size limit?

No hard cap. The work is done in memory in your browser, so huge files simply take longer.

Can I merge only specific pages from each file?

Not in this tool — extract the pages you need with the PDF Splitter, then merge the resulting files.

Page content is copied faithfully, but document-level extras like outlines are not carried over to the new file.

No. pdf-lib rebuilds the merged file inside your browser tab.

PDF Tools100% Private · In-Browser

Stack multiple PDFs into one document in exactly the order you arrange — merged locally with pdf-lib, page for page.

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Merges any number of PDFs (minimum two) in the order shown in the queue.
Reorder with up/down buttons; numbered badges make the final order unambiguous.
Non-PDF files are filtered out automatically with a notice.
The result reports total pages and output size, and dailywebtools-merged.pdf downloads automatically.
Password-protected files fail with a clear message pointing you to the unlock tool.

Add Two Or More PDFs
Drop or browse; they join the merge queue in the order added.
Arrange The Order
Use the arrow buttons — the merged file follows this exact sequence.
Merge
Every page of every file is copied into a fresh document.
Get the merged PDF
The download starts automatically, and a button lets you download it again.

The queue is the table of contents — files merge top to bottom as listed.
Want only some pages from a big file? Extract them with the PDF Splitter first, then merge the results.
Encrypted PDFs cannot be read here; remove the restrictions first, then merge.

Image, PDF, text, calculator and media utilities — all free, all private, all running right in your browser.