Online PDF merge tools are convenient, but they upload your documents to a third-party server — not ideal for contracts, technical drawings, or confidential project files.
Why avoid online PDF mergers?
- Your files are sent to someone else's server
- File size limits (usually 20–50MB per file)
- Slow — depends on your upload speed
- Many tools strip bookmarks and metadata
Merge PDFs locally with TorReader PDF
TorReader PDF uses QPDF (Apache 2.0 licensed) to merge files entirely on your machine. Bookmarks from each source file are preserved and merged into a single continuous outline in the output.
Step-by-step
- Step 1: Download TorReader PDF (free, ~70MB, no install)
- Step 2: Open the app, go to Tools → Merge PDFs
- Step 3: Click "Add Files" and select your PDF files
- Step 4: Drag rows to reorder them as needed
- Step 5: Click "Merge" and choose where to save
The resulting file includes all bookmarks from the source files, automatically chained together in order.