PDF Merge

Combines multiple PDFs into one. You set the order, and the tool warns about encrypted or oversized files before merging.

What it does

Use this to stitch together monthly reports, cover + TOC + chapters, or pages from different sources into a single PDF. The list shows each file's page count and size, and you can reorder by dragging.

How to use

  1. Drag PDFs into the list or click Add PDF Files to pick them.
  2. Adjust the order: drag a row, or use the Up / Down buttons. The top file becomes the first pages of the output.
  3. Type a name into Output Filename (e.g. 2026_Annual_Report). Leave blank to get merged_output.pdf.
  4. Click Run.

You get one merged PDF.

What you see in the list

Each row shows the filename, page count and size. Encrypted files are red and tagged LOCKED. Files over 500 MB also show a "may slow down merging" warning.

Examples

Merge monthly reports: Add the 12 PDFs in order, check the sequence, set the output name to 2026_Annual_Report.pdf, run.

Cover + TOC + body: Put cover.pdf on top, toc.pdf second, body.pdf third. Run.

Spot an encrypted file: You added 10 PDFs and one shows up red with LOCKED. Unlock it with PDF Encrypt first, then come back here.

Watch out

  • Adding the same file twice puts it in the output twice. There is no auto-deduplication.
  • Encrypted PDFs fail at merge time. Unlock them with PDF Encrypt first.
  • Different page sizes (A4 + A3) are kept as-is, no auto-rescaling happens.
  • PDF form fields (AcroForm) may break after merging.
  • Clear All does not confirm, it wipes the list instantly.

License

Free tier has a monthly merge cap. Office plan removes it.