How to Merge Multiple PDFs Into One Document
Updated · FlowToPDF Team
Combining several PDF files into one is simple when you know the right tools. Follow this step-by-step guide to merge PDFs online for free.
When Do You Need to Merge PDFs?
Common scenarios for merging PDFs include:
- Combining invoices and receipts into a single file for bookkeeping
- Assembling a multi-chapter document from separate files
- Sending multiple scanned pages as a single attachment
- Merging reports from different departments into one presentation
Steps to Merge PDFs With FlowToPDF
1. Navigate to the Merge PDF tool.
2. Upload up to 20 PDF files by dragging and dropping or clicking "Choose File".
3. The files will appear in the order they were uploaded. Reorder them if needed.
4. Click Merge. Your combined PDF will be ready in seconds.
5. Download the merged file.
Tips for Best Results
- If you want a specific page order, rename your files numerically before uploading (1.pdf, 2.pdf, etc.) so they appear in the correct order.
- Check the total file size. If the merged PDF is too large, use the Compress PDF tool afterward.
- All files are deleted from our servers within 30 minutes.
Alternatives
If you need to merge PDFs regularly as part of a workflow, consider using command-line tools like pdfunite (from Poppler) or Ghostscript for automation.