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Merge PDF Online - Combine Multiple PDF Files into One

Add your PDFs, put them in the right order and merge them into a single document. Everything happens on your device.

What is Merge PDFs?

Merging PDFs joins several PDF files into one document, keeping every page in the order you choose. Use it to combine chapters, invoices, certificates, application documents or scanned pages into one tidy file. This merger shows the page count of each file, lets you move files up and down and works fully in your browser, so private documents are never uploaded.

How to use Merge PDFs

1Click the upload box and select two or more PDF files. You can add more files again later.
2Use the arrows to set the order; remove a file with the X.
3Press Start.
4Download merged.pdf.

Why use Merge PDFs?

  • Add as many PDFs as you like and reorder them easily.
  • Shows the number of pages of each file.
  • Files never leave your device.
  • Free, with no watermark, limit or sign-up.

Who can use Merge PDFs?

  • Students combining assignments and notes.
  • Job seekers bundling certificates and ID proofs.
  • Businesses merging invoices and reports.

When should you use it?

  • When a portal accepts only one PDF upload.
  • When you want to send a single file by email.
  • When you need to join scanned pages into one document.

Where can you use it?

  • Use it before uploading or emailing documents.
  • Works in Chrome, Edge, Firefox and Safari on Windows, Mac, Linux, Android and iPhone - no app or software to install.

Tips for best results

  • Check the order in the list before pressing Start.
  • Password-protected PDFs must be unlocked first.
  • Need only some pages? Use Split / Extract Pages first.

Related tools

Split / Extract PagesRotate PDF PagesDelete PDF PagesPDF Editor

Merge PDFs - frequently asked questions

How do I merge PDF files?

Add two or more PDFs, set their order with the arrows and press Start. Download merged.pdf.

Can I change the order of the files?

Yes. Use the up and down arrows next to each file.

Is there a page limit?

No fixed limit, but very large files depend on your device memory.

Will the quality or layout change?

No. Pages are copied as they are, so text, images and layout stay the same.

Is it safe for private documents?

Yes. Merging happens in your browser and nothing is uploaded.

Is it free and private?

Yes. AllrounderBox is free, needs no sign-up and never uploads your files – processing happens on your own device.

Does it work on mobile?

Yes. It works in any modern browser on phones, tablets and computers.