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Merge PDF

Add two or more PDFs, put them in order, and download one combined PDF.

Drop PDF files here

Up to 20 MB in total, 200 pages and 100 images.

Add at least two PDFs to merge them into one file.

Files are processed in your browser and are not uploaded to CatTower's servers.

The result is saved as a new file. Some advanced PDF features (forms, signatures, attachments, some metadata) may not be kept, so keep your original.

In short

CatTower's Merge PDF is a free online PDF tool that joins two or more PDF files into one, page by page in the order you set, doing the work inside your browser instead of on a server.

  • Order: the files are combined top to bottom exactly as listed; reorder by dragging or with the arrow buttons.
  • Limits: 20 MB and 200 pages across all files together.
  • Privacy: files are processed in your browser and not uploaded to CatTower's servers.
  • Not supported: password-protected (encrypted) PDFs.
  • Forms, signatures, attachments and some metadata may not be kept; the result is always a new file.

Use cases

  • Hand in a report, its appendix and a signed cover page as one file.
  • Put scanned receipts or statements for one month into a single PDF.
  • Join lecture handouts into one document before reading them or turning them into a mind map.

How to use

  1. Drop two or more PDF files, or choose them. Each file shows its page count as soon as it has been read.
  2. Put the files in order: drag a row, or use its up and down buttons. The first file's pages come first.
  3. Check the total size and page count, then select Merge PDFs.
  4. Download the new PDF. Your original files are left as they were.

FAQ

No. The files are read and merged by your browser on your device and are not uploaded to CatTower's servers. Browser extensions or other software on your device can still see files you open, so use a device you trust for sensitive documents.

As many as fit in 20 MB in total and 200 pages in total. If your browser runs short of memory on a large set, merge fewer files at a time and then merge the results.

No. Encrypted PDFs are not supported and no password is asked for. Remove the password in the app that created the file, then add it again.

Page content is copied as is, but advanced features such as fillable forms, digital signatures, attachments, the outline and some metadata may not be kept in the merged file. Keep your originals.

Yes. Drag the rows or use the up and down buttons (they work from the keyboard too) until the order is right, then merge.