Can I merge a portrait and a landscape PDF?

Yes. Each page keeps its original orientation and size. The merged file will simply contain both layouts, which is normal for mixed documents.

What happens to bookmarks and internal links?

Simple bookmarks usually carry over, but internal links that point to specific page numbers often break because the page count changes after merging.

There is no hard limit, but very large merges (500+ pages or 200 MB+) can strain browser memory. For huge documents, merge in batches of 100 pages.

Yes. Upload the cover PDF first, then the main document, and drag them into order before merging.

Free Online Tool

Combine multiple PDF files into one document in seconds. Works entirely in your browser — no upload, no signup.

Merge multiple PDFs into one file with drag-and-drop ordering. No waiting for uploads.

Pages are appended, not re-encoded, so text and images stay exactly as they were.

Start using the tool immediately without creating an account or logging in.

Works on Windows, Mac, Linux, Android, and iOS as long as you have a modern browser.

Yes. Merging only appends pages; it does not re-encode images or text. A 300 DPI scan in the first file stays 300 DPI in the combined output.

Need more advanced PDF editing? Edit text, OCR scanned pages, fill forms, and add digital signatures.