Merge PDF

Upload multiple PDF files, arrange them, download one combined PDF. Free, no sign-up, your files never leave your browser.

Whether you're combining scanned contract pages, stitching together chapters of a report, or merging exports from different apps into one document, each PDF keeps its original pages and formatting exactly as they were — arrange the files in the order you want, then download a single combined PDF.

How it works

  1. Upload your PDFs. Select multiple files at once.
  2. Arrange the order. Use the arrow buttons to reorder them in the combined file.
  3. Download the PDF. Everything in one file, in the order you chose.

Why Stelluna

Frequently Asked Questions

Is it free?
Yes, no account needed.

Do my PDFs get uploaded anywhere?
No, merging runs entirely in your browser.

How many PDFs can I merge?
Up to 50MB per file, and up to 20 PDFs total.

Can I change the page order?
Yes, use the up/down arrows next to each PDF to reorder it in the combined file.

Can I merge a password-protected PDF?
Encrypted (password-protected) PDFs aren't supported; remove the password first.

Does merging change the quality or formatting of my PDFs?
No — pages are copied as-is from each source file, so text, images, and formatting stay exactly as they were in the originals.

What happens to my files after I download the merged PDF?
Nothing — merging runs entirely in your browser, so once you close or refresh the tab both your uploaded PDFs and the merged file are gone from memory; nothing is stored on our end.

Which browsers and devices does it work on?
Any recent version of Chrome, Firefox, Safari, or Edge, on desktop or mobile — no extra software needed.