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PDFMK

Combine documents

Merge PDF Files Online

Preview the first page of every file, arrange the order, and create one PDF.

Drop PDF files here

Add 2–20 PDFs, up to 100 MB each, 300 MB total, and 1000 pages combined.

Processing starts on your device. If it cannot finish locally, files are automatically uploaded over HTTPS for temporary server processing.

How to Merge PDF Files

1

Upload PDFs

Drag and drop your PDF files or click to select multiple files from your computer.

2

Arrange Order

Check each local first-page preview, then use the arrow buttons to arrange the numbered file order.

3

Download

Click "Merge PDFs" to download the result. The download card remains available if you need it again.

Why Use Our PDF Merger?

  • •No account required - Combine files without creating a PDFMK document library
  • •Explicit order - Move files up or down before creating the combined document
  • •Local previews - Check each first page and page count before merging on your device
  • •Temporary processing - Common PDFs stay on your device; compatibility fallback uses temporary server storage
  • •Focused output - The result is one PDF with sources appended in the displayed order
  • •Page content retained - Existing pages are appended rather than rendered as images; verify complex PDF features
  • •Detailed guidance - Review page size, bookmarks, forms, and signatures in our merge guide

Frequently Asked Questions

Do I need an account?

No. The merger currently works without registration. It does not save a document history, so retain the source and downloaded result yourself.

Is there a file size limit?

Yes. Add 2–20 PDFs, up to 100 MB each, 300 MB total, and 1,000 pages combined. Complex documents may still require a smaller batch.

Will my files be stored?

First-page previews and common merge jobs run locally. If local processing cannot finish, files are automatically uploaded over HTTPS for temporary processing. The processing dialog shows the switch and lets you cancel. PDFMK does not provide permanent result links or an account-based document library. Read the full file flow.

Can I merge password-protected PDFs?

Currently, password-protected PDFs need to be unlocked first before merging.

Need to change pages inside one source first? Organize PDF pages. Need separate files instead of one combined PDF? Split the PDF.