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Merge PDF
Merge PDF Files Online — Free, No Upload
Drag and drop multiple PDFs to combine them into a single file — entirely in your browser.
About Merge PDF
Need to combine multiple PDFs into one document? Whether you are merging chapters of a report, combining scanned pages into a single file, assembling a portfolio, or packaging invoices for accounting, this tool makes it simple. Drag and drop your PDF files into the upload area, then reorder them by dragging to set the desired sequence. You can see the page count for each file before merging, helping you verify you have the right documents. Click merge and download a single consolidated PDF that preserves the formatting, fonts, and layout of every original document. The merge itself runs on pdf-lib, a pure-JavaScript PDF library, entirely inside your browser — no files are uploaded to any server, which is critical when working with confidential contracts, financial documents, legal filings, or medical records. This is a practical everyday tool for office workers, students, freelancers, and anyone who regularly works with PDF documents.
Questions
Is there a limit to how many PDFs I can merge?
There is no hard limit. The tool processes everything in your browser, so the practical limit depends on your device's memory. Merging dozens of average-sized PDFs should work fine.
Will the merged PDF keep bookmarks and links?
Page-level features — annotations, and the widgets a form field draws — are copied with their pages, and the first file's document title and author are carried over. What is not merged is anything that hangs off the document rather than a page: the outline tree, the interactive form, named destinations and page labels. So the combined file starts with no bookmarks, and a merged form still shows its boxes and their filled-in text but can no longer be filled in. Internal links are repointed at the pages they name, so a cross-reference inside one of the documents you merged still lands where it should, whichever file it came from. A link that pointed at a named destination rather than at a page has nothing left to resolve against and does nothing.
Can I reorder the files before merging?
Yes. Drag and drop the files in the list to set the order before you click merge.
Can I merge PDFs with different page sizes?
Yes. Each page keeps its own dimensions and orientation — an A4 page stays A4 next to a Letter or landscape page. Nothing is scaled, cropped, or normalized during the merge.
Can I include the same PDF more than once?
Yes — pick the file again and it appears as a second card in the assembly strip, so you can repeat a cover sheet or a form between documents. Each copy's pages are written out in full.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.