Merge PDF Files Online — Free & Private
Combine reports, invoices, scans, and appendices into a single clean PDF — without any server upload. Upload two or more PDFs, drag to reorder them into exactly the sequence you need, and merge in one click. The final PDF preserves all text layers, hyperlinks, and bookmarks from each source file. Everything runs locally in your browser via WebAssembly, so no confidential documents ever reach a third-party server.
Frequently asked questions
Can I reorder PDFs before merging?
Yes. Upload your files, then drag them into the order you want. The merged PDF follows that sequence page by page.
How many PDFs can I merge at once?
There is no hard count — practical limits depend on your browser memory. Each input file must be within the 100 MB per-file limit.
Is merging secure for confidential documents?
Merging never sends your files to a server. They stay in memory in your browser tab until you download the result and close the page.
Will links and bookmarks be preserved after merging?
DimlyPDF concatenates the PDFs with pdf-lib. Most hyperlinks and navigation features survive, but you should spot-check complex tagged PDFs after merging.
Can I merge password-protected PDFs?
PDFs with an open password require you to remove the password first. Unrestricted PDFs merge without any extra step.
What file format is the output?
The output is a standard PDF file compatible with all PDF viewers, including Adobe Acrobat, Preview, and browser-based readers.