Combine multiple PDF files into a single document in your desired order.
Most PDF merge sites upload your files to their server, join them there and send the result back. That's not ideal for bank statements, medical letters or anything with an ID number on it. Here the merge is done by pdf-lib, a JavaScript library running inside your browser. The pages are copied into a new PDF on your own device, so there's nothing to delete afterwards and nobody else ever has the file.
It also means speed depends on your device, not your internet connection. A few dozen pages take a second or two; a scan running to hundreds of pages on an older phone takes longer.
Pages are copied as they are: text stays selectable, images keep their resolution, and page size and orientation don't change. Merge an A4 file with a US Letter file and the result simply contains pages of both sizes.
Things that belong to a document as a whole, such as its bookmarks panel or fillable form fields, may not carry over or may stop working in the merged copy. If you need those, merge first and add bookmarks in your PDF editor afterwards.
The most common cause is a password-protected PDF. If a file asks for a password when you open it, or has editing restrictions, the tool can't read it and will tell you which file it is. Open it in your PDF reader, enter the password, print it to a new PDF (Print, then Save as PDF) and merge that copy instead.
Now and then a PDF is damaged, or was saved by software that doesn't follow the format properly. Opening it and saving it again from another app usually fixes that.
Use the up and down arrows next to each file. The number on the left shows its position, and the merged PDF follows that order from top to bottom.
We don't set one. The real limit is your device's memory, so huge files on an older phone may be slow or fail. Large files on a laptop simply take a little longer.
Not in this tool; it takes every page of each file. Use Remove PDF Pages or the PDF Splitter first to cut out what you don't need, then merge.
No. There's no watermark, no sign-up and no page limit.
Yes, with our Merge PDF and Image tool, which takes JPG and PNG files alongside PDFs.
OneClickly is a set of 119 free tools for PDFs, images, text, everyday math and code. They run in your browser, so the files and text you work with stay on your device.