Does merging change the original PDFs?

No. The originals remain unchanged and the combined document is downloaded as a new file.

Can I combine scanned and digital PDFs?

Yes, as long as each source is a valid PDF that your browser can read.

Are the documents sent to a server?

No. Supported merging is performed locally in your browser.

How to combine PDF files in the correct order

Combining PDFs is simple, but a useful final document also needs a sensible page order. A quick plan before merging prevents duplicated covers, misplaced signatures, and confusing attachments.

Prepare the files first

Rename files with numbers such as 01-cover, 02-report, and 03-appendix if their order is not obvious.
Open each PDF and remove accidental blank pages or duplicate scans.
Keep originals in a separate folder until the combined PDF has been checked.

Merge and verify

Add the PDFs in the order in which they should appear. After the new file downloads, check the first page, every transition between source files, and the final page. This catches most ordering mistakes without reviewing every line.

For a document that will be printed, also check page orientation. A sideways scan can make an otherwise correct combined file inconvenient to use.

Use a clear filename

Choose a filename that explains the document, version, and date, for example project-report-final-2026-07.pdf. Avoid names such as merged-final-final2.pdf, which become difficult to identify later.

Plan a reader-friendly structure

Put a short cover or summary first when the recipient needs context, followed by the main document and then supporting attachments. Avoid repeating the same cover page in every source. If the package is long, a contents page with section names can save the reader time.

Check boundaries, not only endpoints

Most merge mistakes occur where one source ends and the next begins. Review those transitions for blank pages, upside-down scans, repeated pages, and abrupt changes in orientation. A quick boundary review is faster and more reliable than glancing only at the first page.