Merge PDF

Combine two or more PDFs into one file, in the order you choose.

How to merge PDF files

Choose or drop the PDFs you want to combine. Use Add PDFs to bring in more files later.
Tick each file you want in the merged PDF. Ticked files are listed in the order they will be joined.
Drag a file by its handle, use the up and down arrows, or type a position number to change the order.
Check the output name. The .pdf extension is added if you leave it off.
Press Merge PDFs, then download the combined PDF.

Options

File selection: Only ticked files are merged. Files you open but leave unticked stay listed under Also open in this tab and are not used.
File order: Ticked files are joined from top to bottom. Reorder them by dragging, with the arrow buttons, or by entering a position and pressing Move to.
Output PDF name: Defaults to merged.pdf. Use up to 150 characters without slashes, reserved punctuation such as : * ? " < > |, or control characters.
Undo, Redo and Reset selection: Step back through changes to the selection, order and name, or clear them and start the selection again.

What you get

One PDF with every page of each ticked file, in the order shown.
Pages within each source keep their own order, size and rotation. Merging copies pages; it does not re-encode images or text.
Bookmarks from the source files are not carried into the merged PDF.
Your source files are not changed.

Limits

PDF files only. Convert images to PDF first with JPG to PDF or PNG to PDF.
At least two ticked files are needed. You can add up to 100 files in one drop.
Password-protected PDFs must be unlocked before they can be merged.
There is no fixed page or file-size cap. The memory available in your browser is the practical limit for very large sets.
The order is set per file. To move single pages between documents, merge first and then rearrange the result in Organise PDF.

Check the result

Open the downloaded PDF and compare its page count with the total of the source files. Look at the first and last page at each join to confirm the files are in the right order.

Questions

Can I merge PDFs without uploading them?

Yes. Files are processed in your browser and are not uploaded to a server.

How do I change the order of the files?

Drag a file by its handle, use the up and down arrows next to it, or type the position you want and press Move to. The list shows the final order.

Is there a limit on how many PDFs I can merge?

You need at least two. You can add up to 100 files in one drop and add more afterwards. Very large sets are limited by your device's memory rather than a fixed number.

Will merging reduce the quality of my PDFs?

No. Pages are copied as they are, so text stays selectable and images are not recompressed. To make the merged file smaller, run it through Compress PDF afterwards.

Can I merge only some of the open files?

Yes. Only ticked files are merged. Untick a file to leave it out without closing it.

Are bookmarks kept when I merge?

No. Bookmarks from the source files are not copied into the merged PDF.

How is the merged file checked?

After saving, the merged PDF is reopened and its page count, text and page appearance are compared with the pages they came from. The result screen lists what was measured.