PDF Merger
Combine multiple PDF files into one document. Upload PDFs, arrange them in order, and download the merged result. All processing happens in your browser — no files sent to servers.
Upload PDF Files
How it works
- Upload multiple PDF files
- Arrange them in the order you want (use up/down arrows)
- Optionally enable "Add blank page to each document with odd pages" for duplex printing
- Click "Merge PDFs"
- Download your combined PDF file
Duplex Printing Mode
When you enable "Add blank page to each document with odd pages", the tool will automatically append a blank page to each individual document that has an odd number of pages. This ensures every document has an even page count, which is essential for double-sided printing. Each document will start and end on proper sides, preventing page misalignment during binding, stapling, or collation.
Example: Merging 3 documents with duplex mode enabled:
• Document 1: 3 pages → becomes 4 pages (blank page added)
• Document 2: 2 pages → stays 2 pages (already even)
• Document 3: 5 pages → becomes 6 pages (blank page added)
Total: 4 + 2 + 6 = 12 pages (instead of 10)
About PDF Merger
- Browser-based — All processing happens locally; your files never leave your device
- No limits — Merge as many PDFs as you need (up to 20 at once)
- Reorder easily — Drag and arrange PDFs before merging
- Free — No accounts, no subscriptions, no watermarks
- Works offline — Keep this page open and merge PDFs even without internet