Merge PDF combines two or more PDF files into one document, in the order you choose. Add your files, see the page count and size of each, move them up or down (or sort them by name), remove any you do not want, and download a single merged.pdf. Everything happens in your browser, so contracts, invoices and scans are never uploaded to a server. If a file cannot be merged, for example because it is password-protected or damaged, the tool names it and tells you why.
Made for everyone. Typical uses:
Three files, cover-letter.pdf (1 page), cv.pdf (2 pages) and certificates.pdf (5 pages), become one merged.pdf with 8 pages: the letter first, then the CV, then the certificates. Move certificates.pdf to the top and it comes first instead. Numbered names such as 01-cover.pdf and 10-appendix.pdf sort correctly because the name sort understands numbers.
Password-protected PDFs must be unlocked first, and each file can be up to 200 MB. Merging does not compress, so the result is about as big as the files added together. Bookmarks and form calculations from the source files are not rebuilt in the merged document.
Accuracy: Files are processed with established open-source libraries and tested with real PDFs. Open the result and check it before you send or publish it.
Expert Tip
Compress big scans before merging, and put the files in final order before you click Merge. It is quicker than fixing the order afterwards.
Merging takes the pages of two or more PDF files and places them, in order, in one new document. Nothing about the individual pages changes: text stays text, images stay images and page sizes stay as they were. That is why the merged file is usually about the same size as the originals added together, and why merging is the right tool when you need one attachment instead of five.
Common jobs include combining a cover letter, CV and certificates into one application, joining scanned pages that were saved separately, assembling an invoice pack for an accountant, and producing a single contract with its annexes. Because every input is copied as it is, the result keeps the fidelity of each source.
The first file in the list becomes the first pages of the merged document. Use the arrow buttons to move a file up or down, or the "Sort by name" button when your files are numbered such as 01-cover.pdf, 02-terms.pdf and 10-appendix.pdf. The sort understands numbers, so 2 comes before 10 rather than after it.
Add files in the order you want them if you can. If you realise a file is in the wrong place, move it before you merge: the tool shows the page count and size of every file so you can confirm you have the right versions.
A merge fails for a small number of predictable reasons, and the tool names the file that caused the problem so you can fix it without guessing.
Merging does not compress. Five 8 MB scans make a 40 MB PDF, which many email systems will reject. Compress the individual files, or the finished document, with Compress PDF if you need to stay under a limit. It is usually better to compress the inputs that are large and leave small text files alone, because text-based pages do not benefit much.
If you only need some pages from a long file, extract them first with Split PDF so the merged result does not carry pages nobody needs. This also keeps the final page numbers sensible when the recipient prints the pack.
After merging you may want to fix orientation on a few pages that were scanned sideways, which Rotate PDF handles page by page, or stamp the whole pack with "Draft" or "Confidential" using Add Watermark to PDF. Protecting the final file with PDF Password Protector is a sensible last step when it contains personal information.
For a fuller tour of joining and separating documents, including page-numbering and bookmark tips, see the guide to merging and splitting PDF files.
Merging happens entirely in your browser. Your files are not sent to a server, so confidential material such as contracts, payslips or ID scans never leaves your computer. The trade-off is that very large batches use your device memory: if your browser slows down, merge in two or three smaller groups and then merge the results.
One thing this tool does not do is rebuild bookmarks or forms across documents. If a source file has clickable bookmarks or fillable fields, review the merged file to make sure they behave the way you need, and re-create them in a full PDF editor if they matter.
Combine PDFs into one file, extract pages, split by ranges or every N pages, fix order and orientation, and keep the result small and private.
Pick the right method for scans, slides, photos and text documents, hit email and upload limits, and stop big PDFs at the source with better scan and export settings.
Which format to use when sending, printing, editing or archiving a document, with the strengths and weaknesses of PDF, DOCX, images, plain text and more.
Explore more in PDF Tools, read the guides and articles, or see how we test our tools.
Extract specific pages from a PDF file.
Best for sending only the relevant pages of a long report or contract
Reduce PDF file size to a target you set, or with lossless optimizing or a smaller image-based copy.
Best for getting a PDF under the size cap of a job, visa, school or government upload form
Convert JPG and PNG images to PDF.
Best for combining phone photos of paperwork into one document
Rotate PDF pages by any angle.
Best for fixing pages that were scanned sideways or upside down
Convert PDF pages to JPG images.
Best for extracting a single page from a PDF as an image to share or embed
Reorder pages in PDF files.
Best for fixing a PDF where pages were scanned in the wrong order
Shrink a PDF to under 500 KB for email and forms.
Best for emailing an invoice, statement or contract to a client whose server limits attachments
Shrink a PDF to under 1 MB with the least quality loss.
Best for submitting an assignment or thesis chapter to a portal with a 1 MB cap