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PDF zusammenfügen

Mehrere PDFs zu einem kombinieren — ordne die Dateien neu an und lade ein einziges PDF herunter.

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Merging PDFs sounds trivial until the details bite: page sizes that differ between files, a scan rotated 90°, bookmarks that vanish, or a 200 MB result from four 5 MB inputs. This tool concatenates the documents while keeping each page's original geometry, rotation and embedded fonts intact, so a merged A4 report with an A3 foldout stays exactly that.

Order is set by dragging, not by filename. That matters because alphabetical sorting puts "chapter-10" before "chapter-2", which is the single most common way a merge goes wrong.

How it works

  1. Drop in two or more PDFs, or pick them from your file manager.
  2. Drag the cards to set the order the documents should follow.
  3. Remove any file you added by mistake without starting over.
  4. Download the merged PDF — one file, pages in your order.

What people use it for

  • Assembling an invoice, its delivery note and the payment receipt into one attachment before emailing an accountant.
  • Joining chapters exported separately from Word or LaTeX back into a single deliverable.
  • Combining a signed contract page scanned separately with the original unsigned document.

Frequently asked questions

Is my file uploaded to a server?
No. The file is opened by JavaScript and WebAssembly running inside your own browser tab. It is never uploaded, there is no server-side processing and nothing is stored — closing the tab discards everything.
Is there a limit on how many PDFs I can merge?
There is no fixed count. The practical limit is your device's memory, since every page is held in RAM while the file is built. A few hundred megabytes of input is comfortable on a normal laptop; on an older phone, merge in batches.
Are bookmarks and links kept?
Standard merging keeps each page's content, annotations and internal links. If you specifically want each source file to become a top-level bookmark in the result, use the Merge with bookmarks tool instead.
Can I merge password-protected PDFs?
Not directly — an encrypted file has to be unlocked first. Run it through the Unlock PDF tool (you need the password), then merge the result.

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