Merge PDF Files
Add PDFs, drag to reorder, set optional page ranges, then merge. Everything happens in your browser. Files are never uploaded.
How to Merge PDFs
Combining PDFs is one of the most common document chores: expense receipts for a report, chapters of a manuscript, or scanned pages that arrived as separate files. This merger handles it without accounts, watermarks, or uploads. Click the file picker and select two or more PDFs. Each file appears as a card showing its name and page count. Drag cards up or down to set the final order, because the merged document follows the card order from top to bottom.
Need only part of a file? Type a page range into the card, for example 1-3, 5 to take pages 1 through 3 plus page 5. Leave the field empty to include the whole file. Page numbers start at 1, matching what you see in a PDF reader. When everything looks right, click Merge PDFs. The tool loads each file, copies the selected pages in order into a fresh document, and offers the result for download with a sensible filename like merged.pdf.
Tips for a Clean Merge
Check page ranges before merging: the tool warns you about out-of-range numbers, but a typo like 12 when you meant 1-2 will still merge page 12 happily. If your PDFs have different page sizes, the merged file keeps each page original size, which is usually what you want. For a uniform look, run the result through the Resize PDF Pages tool afterward. Very large merges can take a few seconds and use noticeable memory; on a phone, merge three or four files at a time rather than twenty. Because processing is local, you can work with confidential documents without worrying about who else sees them.
What the Merger Preserves
Pages are copied without re-rendering, so text stays selectable, images keep full resolution, and vector graphics stay sharp. What does not survive the merge: document-level bookmarks, interactive form fields, and embedded file attachments, because the underlying pdf-lib library focuses on page content. If you need bookmarks in the combined file, add them afterward in a desktop PDF editor. For splitting the result back apart later, use the Split PDF tool.
Frequently Asked Questions
How do I merge PDF files with this tool?
Add two or more PDF files using the file picker, then drag the file cards into the order you want them combined. Optionally type a page range like 1-3 for any file to include only those pages. Click Merge PDFs and the tool stitches everything together in your browser, then downloads a single PDF. Nothing is uploaded to any server, so the merge works even on a slow connection and your documents stay private.
Is there a limit on how many PDFs I can merge?
There is no artificial limit in the tool itself. The practical limit is your device memory, because the PDFs are loaded and processed in your browser. Merging a handful of typical documents works fine on phones and laptops. If you are combining very large files, hundreds of megabytes each, use a desktop browser with plenty of RAM and merge in smaller batches, then merge the results.
Can I merge only some pages from each PDF?
Yes. Each file card has a page-range field where you can type ranges like 1-3, 5, 8-10. Leave it blank to include every page of that file. The tool validates your ranges against the actual page count of each PDF and tells you if a page number is out of range, so you can fix typos before merging.
Will merging change the quality of my PDFs?
No. The merge copies pages exactly as they are, without re-rendering text or images, so quality is preserved at 100 percent. Fonts, vector graphics, and images pass through untouched. The only change is that the pages now live in one file instead of several. Bookmarks and form fields from the originals are not carried over, which is a current limitation of the underlying library.
Are my files uploaded to a server?
Never. This tool runs entirely in your browser using the pdf-lib JavaScript library. When you pick files, they are read into your browser memory and processed locally. No file data is sent anywhere, which makes the tool safe for contracts, resumes, medical records, and other sensitive documents. You can even disconnect from the internet after the page loads and the merge will still work.
The merged PDF pages are in the wrong order. What happened?
The output follows the top-to-bottom order of the file cards at the moment you click Merge. If the order looks wrong, check the cards before merging and drag them into the right sequence. Also check each card page range: a range like 5-1 is treated as 1-5, and a blank range means all pages. Reorder, adjust ranges, and merge again.