How to Merge Multiple PDFs Into One — Free Online Guide

When merging PDFs is useful

Combining chapters into a single document, merging invoices for accounting, assembling proposals from separate sections, packaging reports into one email attachment.

How to merge

1. Open the Merge PDF tool. 2. Click Add Files and select all PDFs to combine. 3. Drag to reorder — this order becomes the final document order. 4. Click Merge PDF. 5. Download.

Getting the order right

Name files with numerical prefixes before uploading: 01-cover.pdf, 02-contents.pdf, 03-chapter1.pdf. Makes ordering faster and less error-prone.

After merging

Compress the merged file using the Compress PDF tool if file size is important, especially for image-heavy PDFs. The merged file size is approximately the sum of the individual files.

What merging does not do

It does not re-order pages within individual files, fix or update bookmarks, or update tables of contents.

FAQ

Is there a file limit? Browser-based tools handle 10 to 20 files comfortably. For very large batches, merge in groups.

Will merging reduce quality? No. Merging combines files as-is with no re-compression.

Can I merge a PDF and an image together? Convert the image to PDF first using JPG to PDF or Scan to PDF, then merge.