About the Merge PDF tool
Merging PDFs is one of those jobs that comes up constantly: a scanned signature page that needs to sit inside a contract, a stack of invoices that should travel as one attachment, or a set of chapter files that need to become a single report. PDFOrchard's merge tool joins any number of PDFs into a single document, in whatever order you choose, without installing anything or handing the files to a server.
Most "merge PDF" tools you'll find online work by uploading your files to a remote server, combining them there, and sending the result back down to you. That round trip is where the privacy trade-off happens: for a moment, your files exist on hardware you don't control. This tool skips that step entirely. The merge logic runs as JavaScript already loaded in your browser tab, using your own device's memory to build the combined file byte by byte, so the files never leave your computer at any point in the process.
How to merge PDF files
- Open the Merge PDF tool and drop in every file you want to combine, or click the drop zone to browse for them.
- Drag the entries in the list into the order you want the final document to read. The number beside each file shows its position.
- Remove any file you added by mistake with the Remove link next to it.
- Click Merge PDFs. Your browser builds the combined file locally and starts the download as merged.pdf.
Tips for best results
- Rename your files with numbers first (01-cover.pdf, 02-body.pdf, 03-appendix.pdf) so the intended order is obvious at a glance before you even start dragging them around.
- Open each source file once beforehand and check page orientation. A merge tool combines pages exactly as they are; it won't straighten out a sideways page for you (use Rotate PDF first if one needs fixing).
- If a file won't add to the list, double-check it's an actual PDF and not a scanned image saved with a .pdf extension by mistake, or a PDF that's still password protected.
- For very large merges (dozens of files, or files with high-resolution scanned images), give your browser a moment after clicking Merge PDFs — the work happens on your device's own processor, so speed depends on your computer rather than a queue on someone else's server.
Common ways people use this
- Combining a cover letter, resume, and portfolio into one PDF for a job application.
- Joining scanned receipts into a single expense report before submitting it.
- Stitching together chapters or sections that were exported separately from a word processor.
- Assembling a closing packet from several contracts and signature pages.
- Combining several months of scanned bank or utility statements into one file for a mortgage or loan application.
Good to know
Because merging happens in your browser's memory rather than on a server with dedicated resources, extremely large combined files (many hundreds of megabytes) can be slower on an older or memory-constrained device. If a merge seems stuck, try combining files in two smaller batches and then merging those two results together.
Frequently asked questions
Is there a limit to how many PDFs I can merge?
There's no hard cap built into the tool. In practice, the limit is your device's available memory, since everything is processed in your browser's RAM rather than on a server.
Will the page order in each source file be preserved?
Yes. Every page inside a source file keeps its original internal order; you're only choosing the order of the files themselves.
Does merging reduce PDF quality?
No. Pages are copied as-is, so text stays sharp and embedded images keep their original resolution.
Can I merge password-protected PDFs?
Not directly. Remove the password first (for example with a PDF reader you have permission to use), then merge the unlocked file.
Will bookmarks or a table of contents survive the merge?
Page content, including any text and images on each page, carries over intact. Document-level bookmarks and outline entries from the original files are not currently carried into the merged file, so if navigation bookmarks matter for your use case, you may need to re-add them afterward in a PDF reader that supports editing outlines.
Can I merge PDFs from my phone?
Yes. The tool is a normal web page, so it works in a mobile browser the same way it does on desktop — tap the drop zone to choose files from your phone's storage or a connected cloud folder, then merge and download as usual.