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Merge PDF
Combine several PDF files into one PDF, free, in your browser. Pick the files, put them in order, and download the merged PDF — your files are never uploaded to any server.
Example: two small test PDFs — one with 3 pages (1,610 bytes) and one with 2 pages (1,296 bytes) — merged into one 5-page PDF of 2,227 bytes.
Add two or more PDFs. Use the up and down buttons to set the order they appear in the merged file.
Your merged PDFReady to download
Add two or more PDF files, set the order, then press Merge PDFs. The merged file appears here as a download link.
How to merge PDF files
- Click the box above, or drag your PDF files onto it. Add two or more files.
- Use the up and down arrows next to each file to set the order. The first file in the list becomes the first pages of the merged PDF.
- Press Merge PDFs. The tool joins the files in order, in your browser.
- Press Download merged PDF and save the file. Your originals are untouched.
Worked example — two test PDFs into one
We tested the merge tool with two small PDFs made for the check. The first had 3 pages and was 1,610 bytes; the second had 2 pages and was 1,296 bytes. After merging, the result was a single PDF with 5 pages and a size of 2,227 bytes — smaller than the two files added together (2,906 bytes), because the merged file shares one set of shared parts instead of two. The page order was kept: pages 1–3 from the first file, then pages 1–2 from the second.
Frequently asked questions
How do I merge two PDF files for free?
Open this page, add the two PDFs, check the order, and press Merge PDFs. There is no account, no email, and no fee. The merge happens on your device, so the files never leave it.
Is there a limit on how many PDFs I can merge?
No fixed limit on this page. Very large files — hundreds of pages, or files over about 50 MB — can be slow on a phone, because the work happens in your browser. For everyday files, two to twenty PDFs merge in a few seconds.
Will merging change my PDF pages?
No. The pages are copied as they are — same text, same images, same size. The tool does not re-draw or re-compress the pages.
Are my PDFs uploaded anywhere?
No. The merge runs fully in your browser with the pdf-lib library, which is stored on this site. Your files never travel over the internet.
Can I merge a PDF with a password on it?
No — password-protected PDFs cannot be opened by this tool. Remove the password in your PDF reader first, then merge.
Your files never leave your device. This tool runs fully in your browser. Your files are not uploaded to any server, not stored anywhere, and not seen by anyone else. Close the tab and they are gone.
Sources and method. pdf-lib 1.17.1 (vendored on this site). Merge tested in Node with two test PDFs: 3 pages at 1,610 bytes + 2 pages at 1,296 bytes = 5 pages at 2,227 bytes.