Merge PDF Files
Add your PDFs and use the arrows to arrange them. The merged document includes every page in the displayed file order.
Runs locally in your browserLocal processing ·
Add your PDFs and use the arrows to arrange them. The merged document includes every page in the displayed file order.
Runs locally in your browserAdd the PDFs you want to combine, arrange them in the order the pages should appear, and produce a single file. Merging rewrites the page tree: every page from every input is copied into one output document in the order shown in the queue.
The files are read and assembled in the browser rather than uploaded, so confidential documents stay on your own machine. The practical limit is therefore your device's memory rather than a server quota, and a merge of very large scans will be slower than the network upload you may be used to.
Every page object from the input files is copied into the output in queue order, keeping its own size, orientation and rotation. Nothing is re-compressed or resampled, so text stays selectable, embedded fonts stay intact and a scanned page keeps exactly the pixels it had. The output is typically slightly smaller than the sum of the inputs, because shared resources such as fonts are written once.
Document-level structures are the part that does not survive cleanly. Bookmarks or outlines, named destinations, form fields, annotations, article threads and attached files belong to the document rather than the page, and merging a queue of files generally keeps the structure of the first one at best. Digital signatures are always invalidated, because a signature covers the bytes of the file it was applied to.
Split out the pages you actually need, rotate anything scanned sideways, and remove password protection first. A queue of large scans is the slowest case: the browser has to hold every page in memory, so compressing a 50 MB scan before merging it is much faster than merging five of them at full size.
Mixed page sizes are allowed and produce a document whose pages differ in size, which is normal for appendices and scanned inserts but awkward for printing. If the result has to be uniform, merge first and resize afterwards rather than resizing each file separately and losing quality twice.
Encrypted files are the most common cause. A PDF with an owner password set to prevent copying cannot be read without the password, and the merge cannot proceed, so remove the protection in a reader that knows the password and save an unprotected copy. Files that were interrupted during download, or that use an unusual XFA form structure, can fail in the same way.
Very large jobs can also exhaust the memory available to the tab. If the page becomes unresponsive, close other tabs, merge in smaller batches, and then merge the intermediate results into the final document.
Accepts one or more PDF files selected by the user; outputs a single PDF file with pages merged in the queue order.
Combining multiple documents into one deliverable; reordering sections before sending a technical report; assembling scanned pages into a single PDF for archiving.
The selected PDF files are processed by browser JavaScript to merge and reorder pages; these PDF files are not uploaded to KivTools.
Only PDF files are accepted; other document formats must be converted to PDF before merging.
No. The files are read and assembled inside the browser, so they never leave your device and the tool keeps working offline. That is also why the tool has no server-side size limit and why performance depends on the machine you are using.
Page-level content survives intact, but document-level structures such as outlines, form fields, named destinations and attached files are not merged reliably, and any digital signature is invalidated by the operation. Plan on re-creating bookmarks in the merged file if they matter.
No. Pages are copied rather than re-rendered or re-compressed, so text remains searchable, fonts remain embedded and scanned images keep their original resolution. The file does not become sharper or blurrier; it only changes which document contains which pages.
Not while the protection is in place. Open the file in a reader with the password, save an unprotected copy, and merge that. A PDF whose only restriction is an owner password can usually be re-saved without restrictions by an application that has been given the password.
Split the document first, keep the pages you need, and merge the results in the order you want. Merging whole files here is deliberate: the split and page-organizer tools give you per-page control without a second queue.
Use the images-to-PDF tool to turn pictures into a PDF first, then merge it with your other documents. That produces a consistent page size and avoids the mixed-resolution results you get from combining raw images and documents in one step.