Merge PDF Files
Combine multiple PDF files into one document. Works entirely in your browser — your files never leave your device.
Drop PDF files here, or click to browse
Select multiple PDF files (any order)
How to merge PDF files
- Drag and drop PDF files into the box above, or click to browse
- Reorder files if needed (they'll be merged in the order shown)
- Click "Merge PDFs" — processing happens entirely in your browser
- Download your combined PDF instantly
Why use this tool?
- 100% private: Your files never leave your device. No uploads, no servers.
- Free: No sign-up, no limits, no hidden costs.
- Works offline: Once loaded, the tool runs without internet.
- No limits: Merge as many files as you want.
Frequently Asked Questions
Is there a limit on how many PDFs I can merge?
No limit. Your browser handles everything — merge as many files as you need. Performance depends on your device and file sizes.
Does the merged PDF keep the original quality?
Yes, 100%. pdf-lib copies pages without re-encoding, so quality is preserved. The merged file is comparable to the originals in size.
Can I merge different page sizes?
Yes. Each page keeps its original dimensions. The result will have mixed page sizes, which most PDF readers handle fine.
Is my data safe?
Completely. Your files never leave your device. All processing happens in your browser using JavaScript. No uploads, no servers, no logs.