A little clarity before you get started.
Will the original files change?
No. The tool creates a new PDF and leaves your originals untouched.
Can I combine PDFs with different page sizes?
Yes. Each copied page keeps its original dimensions. The result can contain a mix of portrait, landscape, and differently sized pages; merging does not scale them to a common paper size.
Is merging the same as compressing a PDF?
No. Merging combines page content into one document. It does not promise a smaller file, optimize scanned images, or reduce image resolution. The final size depends on the source documents.
Will bookmarks, form fields, and digital signatures be preserved?
Do not rely on those features surviving page copying. Check the output carefully and retain your originals. A digital signature authenticates a specific document state and should not be treated as valid on a newly assembled file.
Can I change the page order inside one source PDF?
This merger follows the existing order within each file. Use Extract PDF pages to create a reordered selection first, then merge that prepared file with your other documents.
Do I need an account to use this tool?
No. This tool is free to use without signing in. An account lets you keep a list of favorite tools.
Can I use this on a phone?
Yes, with a current browser. File support, download behavior, and available memory vary by device. For large documents and images, a computer is often more comfortable.