Merge runs in your browser so we do not host every PDF. Your files are not uploaded by default.
Drop the PDFs on this page, or use the file button. You need at least two. The merge program loads after you choose them, not when the page first opens. If a file asks for a password, unlock it on Unlock PDF first, then come back. We do not guess passwords.
With 20 pages or fewer in total, each page is a card. The border color tells you which file it came from. Drag a card onto another card to move it. The number on the card is its place in the merged file, so page 2 of one PDF can sit in front of page 3 of another. Every page stays; this page does not delete pages. With more than 20 pages we ask before drawing the cards, because that can make the tab slow. If you leave them hidden, the files are joined whole, from the top of the list to the bottom.
Processing runs in a Web Worker on this device after you press Merge. We keep that work local so we do not pay to combine every upload on our servers. By default the PDFs are not uploaded. Save merged.pdf when it is ready. The page order on screen is the order in that file.
By default, no. Merge runs in your browser so we do not host or combine every PDF on our servers. Open DevTools, select Network, merge files, and confirm the PDFs are not posted to a remote host. Page assets may still load from this site; the PDFs themselves are not sent on the default path.
Yes, when the page cards are on screen. Each file has its own border color. Drag a card onto another card to set where that page lands in merged.pdf. You can interleave pages from different files this way. Every page stays in the result; dragging does not delete a page. Above 20 pages the cards stay hidden unless you choose to show them, and whole files then join in list order.
Drawing every thumbnail can make this tab slow, so more than 20 pages stay hidden by default. We ask before drawing them. If you leave them hidden, the files are joined from top to bottom as whole documents. You can still choose to show the pages and arrange them one by one.
Merge runs in a Web Worker inside your browser. Local processing is how we avoid server-side merge jobs. The heavy merge code loads only after you choose files, not when the page first opens.
You must add at least two PDFs. The current file cap is 20 files. Each file must also stay within 100 MB, and the combined page count must stay within 200 pages.
Each input must stay within 100 MB. The merged job must stay within 200 pages in total and 20 files. Larger jobs are rejected with a clear error.
Encrypted PDFs and files that need a password to open are rejected with a clear error. Unlock the file on Unlock PDF first if you already know the open password or only need to clear a permission lock, then come back to merge. This site does not recover or guess passwords.
No. Merge copies pages into a new PDF. Document outline (bookmarks), embedded attachments, and fillable form fields are not kept. Do not use this tool if you need those structures to survive.
Yes. Merge PDF is free in your browser and does not use credits. No account is required. You still have to stay within 100 MB, 200 pages, and 20 files.