How many PDFs can I merge at once?

You can merge up to 50 PDFs in a single operation. The combined file can be reordered with drag-and-drop before downloading.

Will merging change the quality of my PDFs?

No. PDFWix performs a lossless merge — pages, fonts, images and form fields stay byte-identical to the originals.

Can I merge password-protected PDFs?

Unlock the file first with our Unlock PDF tool, then merge. We don't bypass passwords for security and legal reasons.

Does merging keep bookmarks and the table of contents?

Bookmarks from the first PDF are preserved. We also stitch outlines from subsequent PDFs as second-level entries when present.

My Merge PDF job is stuck on "processing".

Refresh the page and try again. Browser-side processing depends on your device's CPU and RAM, so closing other tabs usually helps.

The downloaded file looks different from the preview.

Clear your browser cache and re-run the job. Outdated cached fonts can occasionally cause rendering glitches. If the issue persists, email us a sample to help@pdfwix.com.

Can I undo a Merge PDF operation?

Your original file is never modified — PDFWix always produces a new file. Just discard the new version and start again with the original.

How to Merge PDF: A Step-by-Step Guide

Combine PDFs in any order, in seconds. Free, private, browser-based — no signup, no watermark, no upload required.