Free Online Merge PDF Tool

1. Click Add PDF files and select two or more PDFs (you can add more in further steps).
2. Use the up and down arrows to arrange the files in the order you want their pages to appear.
3. Remove any file you added by mistake with the ✕ button.
4. Click Merge PDFs, then download the combined document.

Merging is the most common PDF editing task: stitching a cover letter, a contract and an appendix into one file, or assembling scanned pages that arrived separately. The PDF format, standardised as ISO 32000, stores each page as an independent object in a page tree, which makes it possible to copy pages from one document into another without re-rendering or quality loss.

This tool uses pdf-lib to create a fresh, empty PDF and then copy every page from each source file into it, in the order you arrange them. Because pages are copied as native objects, text stays selectable, vector graphics stay sharp, and embedded fonts and images are preserved. The only things that may not carry over are document-level structures such as outlines (bookmarks), since those reference the original document tree.

Everything runs locally. Your files are read into memory, combined, and offered back as a download; nothing is transmitted to a server, which keeps confidential contracts and personal records private.