Why Merge PDF Files?
Combining multiple PDF files into a single document is one of the most common document management tasks. Whether you are assembling a business report from separate department files, combining bank statements for tax filing, merging contract pages with exhibits, or creating a complete portfolio from individual project PDFs — the merge tool handles it all in seconds.
A single merged PDF is easier to share (one email attachment instead of several), easier to print (one print job, correct page order), and easier to archive (one file to find later).
How to Merge PDFs on ILoveConvert
- Go to ILoveConvert Merge PDF
- Click to upload your PDF files, or drag multiple files at once. You can upload up to 20 PDFs in one merge job.
- Drag the files in the upload list to arrange them in the order you want in the final document
- Click Merge PDFs
- Download the single combined PDF
Controlling Page Order
The order of files in the upload list determines the page order in the merged PDF. File 1's pages come first, followed by File 2's pages, and so on. If you need a specific page order:
- Name your files numerically before uploading:
01_intro.pdf,02_chapter1.pdf,03_appendix.pdf - Use the drag-and-drop reorder handles in the upload panel to rearrange after uploading
- If you need to rearrange individual pages across files, use our Split PDF tool first to extract pages, then merge them in your desired order
Merging PDFs With Different Page Sizes
ILoveConvert handles mixed page sizes — you can merge an A4 document with a Letter-size document without any issues. The resulting PDF will contain both page sizes as they are. If you need all pages to be the same size for printing or presentation, you can print the merged PDF to a new PDF and specify a single page size.
What Gets Preserved During Merge
- All text content, fonts, and formatting
- Images at their original quality
- Page dimensions and orientation (portrait/landscape per page)
- Hyperlinks and internal document links
- Bookmarks (may be reset depending on tool)
Merging Secured or Password-Protected PDFs
PDFs with a user password (required to open the file) cannot be merged until unlocked. Remove the password first by opening the PDF and re-saving without security, or using a PDF unlock tool. PDFs with only an owner password (restricts editing but not opening) can usually be merged without issues.
Best Practices for Large Merge Jobs
- Compress each PDF before merging if the combined file size is a concern — our Compress PDF tool can reduce individual files by 30–60% before you merge them
- For more than 20 files, merge in batches of 20, then merge the resulting combined files together
- After merging, add bookmarks in a PDF editor (Adobe Acrobat, PDF-XChange) so readers can navigate to each section
- Test the merged PDF by scrolling through it and confirming page order before sharing
Frequently Asked Questions
Does merging reduce PDF quality?
No. Merging is a structural operation — pages are extracted and re-packaged without re-encoding any content. Image and text quality are identical to the originals.
Can I merge more than 20 PDFs?
Merge up to 20 at once. For more, merge in two batches then merge the results.
How large can the total file size be?
Each individual upload is limited to 50 MB. The total merged output size is not separately limited.