How to Merge PDFs Online for Free

Merging PDFs is boring until a portal demands one attachment. Then you need invoices, a cover letter, and a signed page in a single file — today, not after IT installs Acrobat.

Steps

Open /tool/merge-pdf. Upload two or more PDFs in the order you want them to appear. Run the merge and download the combined document. Temporary processing files are removed after the job.

Before you merge

Put the cover first. Remove blank pages with /tool/edit-pdf-pages. Fix sideways scans with /tool/rotate-pdf so the final packet reads top to bottom.

After you merge

Large scan packets often need /tool/compress-pdf before email. Client delivery may also need a password — see the protect checklist on this blog. For merge-then-compress in one path, use /merge-and-compress-pdf.

What merge won’t do

It doesn’t redesign layouts or OCR image-only scans into editable text. It concatenates pages in order. That’s the job most people actually need.

Order, names, and a quick read-through

Name the download after the packet, not after the first file you uploaded. “invoice-march.pdf” is useless when the packet also holds the contract and the ID page. Scroll the result once: a sideways scan in the middle is easier to fix with rotate before you send than after the client replies. If one source PDF is itself a scan of many pages, you do not need to split it first — merge accepts whole files and keeps their internal page order. Password-protected inputs have to be unlocked before they will join the packet. After the merge, compress only if the combined size is the problem. Merging does not shrink anything on its own.