PDF Merge Tool

Combine multiple PDFs into one file instantly. Everything stays in your browser.

Add PDF files

Drag and drop PDFs here

Up to 15 MB per file, 60 MB total for smooth merging.

All processing happens locally in your browser. No uploads.
Total files 0
Total size 0 B
Download merged PDF

Merge PDFs quickly in your browser

Calcwise PDF Merge combines your documents directly on your device. No uploads, no waiting, and full privacy for sensitive files.

How it works

  1. Add the PDFs you want to merge.
  2. Reorder files using the up and down controls.
  3. Click merge, then download the combined PDF.

Performance tips

  • Keep each file under 15 MB and the total under 60 MB.
  • Close heavy browser tabs to free memory before merging.
  • Use compressed PDFs for faster downloads.
Note: Merging happens locally in your browser. No files are stored or transmitted.

Frequently Asked Questions

Are my PDFs uploaded to a server?

No. The merge happens entirely in your browser and files never leave your device.

What happens if my files are too large?

The tool blocks files over 15 MB or a total over 60 MB to keep merging fast and stable.

Can I merge password-protected PDFs?

Encrypted PDFs may fail to merge. Remove protection before uploading to your browser.