How to merge PDF files
- Choose Merge PDF files free, then use Attach PDFs to select the source documents. Check the file queue to confirm that every intended PDF has been added.
- Use the arrow controls to arrange the files. Put the document that should appear first at the beginning of the queue and remove any accidental duplicate before proceeding.
- Choose Merge PDF, or Merge Now in the file queue. Wait for processing to finish; combining long or image-heavy documents may take additional browser memory and time.
- Download the combined file. Open it and check the joins between documents, the total page count, and whether the final attachment is present before sending the packet.
Useful reasons to combine documents
An application may require a completed form, an identification copy and a supporting letter in one attachment. A project handover can include a cover note, a technical report and maintenance instructions. A teacher might join a worksheet with its reference reading. Merging gives those separate PDFs a clear sequence without asking the recipient to open and organize each file themselves.
Choose an order that explains the packet: overview first, detailed material next, supporting evidence last. Rename similar source files beforehand if that helps you tell them apart. The queue controls move whole documents; the pages inside each attached PDF follow that document's existing order.
Prepare only the material you need
A merged file contains the pages from the attached sources, including blank sheets and outdated covers. Use Extract PDF Pages first if you need only selected sheets from a larger document. Use Organize PDF after merging if individual pages need rearranging. When combining invoices or records for several people, inspect each source for details that should not be included in the same recipient's copy.
What merging does not do
Merging is not compression, OCR or text editing. The output can still be large, with mixed page orientations. It does not create a table of contents or update printed page numbers. Pages are copied, but bookmarks, form relationships and complex features may not transfer as expected. Existing digital signatures should not be assumed valid in the combined document. Keep original signed files when their integrity matters.
Private assembly in your browser
The source PDFs are processed in the browser and are not uploaded to a FlowPDF server. No signup or payment is needed to combine them. You receive a new download rather than an overwrite of the source files. Consult the privacy policy for separate information about website analytics and resources loaded by the site.