When do you need to merge PDFs?
Merging PDFs is one of the most common document tasks. You might need to combine a cover letter and resume into a single application, join multiple scanned pages into one file, assemble a multi-chapter report from separate documents, or package several invoices into one PDF for accounting.
Step-by-step: Merge PDFs with PDFKing
Upload your PDFs
Go to pdfking.net/merge.html. You can drag and drop multiple PDF files at once onto the upload zone, or click to browse. All files are loaded simultaneously and analysed in your browser.
Review the file queue
Each file appears as a card showing a thumbnail of its first page, the filename, page count, and file size. This lets you confirm you've got the right files before merging.
Drag to reorder
Grab the grip handle () on the left of any card to drag files into your preferred order. The files will merge in the order shown — top to bottom.
Add or remove files
Drop more PDFs onto the upload zone at any time to add them to the queue. Click the ✕ button on any card to remove that file. The page count and file total update automatically.
Name your file and merge
Enter a filename in the output field (default: merged_document.pdf) then click Merge Files. PDFKing processes each document in order, combines all pages, and downloads the result immediately.
What you see while merging
While PDFKing processes your files, a progress bar shows which document is being integrated — for example, "Integrating document 2 of 5". For large batches, you'll see each file processed in sequence before the final PDF is written and downloaded.
How many files can I merge?
There's no hard limit. Since all processing happens in your browser, the practical limit is your device's available memory. Merging 50–100 PDFs works without issues on a modern laptop. The merge button stays disabled until you have at least 2 files in the queue.
Does merging affect quality?
No. PDFKing merges at the page level — it copies pages from each source document into a new PDF without re-rendering or re-compressing anything. Images, fonts, and layout are preserved exactly as they were in the originals.
Frequently asked questions
Can I merge password-protected PDFs?
You'll need to unlock them first using PDFKing's Unlock PDF tool, then merge the unlocked copies.
Can I keep adding files after the initial upload?
Yes — the upload zone stays active after your first batch loads. Drop more files onto it any time and they'll be added to the bottom of the queue for you to reorder.
What happens to my files after merging?
Nothing — they're never sent anywhere. All processing is local to your browser. Once you close the tab, the files are gone from memory entirely.