How to merge PDF files

  1. 1

    Upload your PDFs

    Click or drag to upload two or more PDF files. You can add up to 20 files at once.

  2. 2

    Arrange the order

    Drag the file thumbnails into the order you want them to appear in the merged PDF.

  3. 3

    Merge and download

    Click Merge PDF. Download the single combined PDF when processing is complete.

About PDF merger

Merging multiple PDF files into one document is one of the most frequent document tasks in professional and academic settings. Whether you are assembling a report from separately authored sections, combining scanned forms, or packaging a set of attachments into a single file, DocumentFlipper makes the process fast and reliable.

You can upload up to 20 PDF files at once and drag them into exactly the order you need before merging. The tool combines all pages from each file in sequence, producing a single PDF with continuous page numbering. No content is altered — text, images, annotations, and form fields from every source file are preserved in the output.

Your files are processed on our secure server over an encrypted connection. All uploaded files and the merged output are automatically deleted within two hours. No account or registration is required.

Frequently asked questions

How many PDF files can I merge at once?
Free users can merge up to several files in one batch; Pro users can merge larger batches with no daily limits.
Can I reorder pages before merging?
Yes. Drag and drop your uploaded files into the order you want before merging them into one PDF.
Will merging affect the quality of my PDFs?
No. Merging combines your files without re-compressing or altering page content.
Do I need an account to merge PDFs?
No account is required for basic merging. Files are processed and then deleted automatically within 2 hours.
Can I merge password-protected PDFs?
Yes — if a PDF has an open password, enter it when prompted before merging. All passwords are handled securely and never stored on our servers.