PDF Merger
Combine PDF files into one document, in any order. Everything happens in your browser — your documents never leave your device.
Combine multiple PDF files into one, right in your browser — no uploads, no account, no file-size limits beyond your device. Add, reorder and remove files, then download the merged PDF.
Library: pdf-lib (MIT license), running entirely in your browser.
How to use the Merge PDF Files Online
- Add two or more PDF files.
- Drag to reorder them.
- Download the merged PDF — created locally on your device.
Frequently asked questions
Is it safe to merge PDFs here?
Yes — files never leave your device. Merging runs locally in your browser.
Can I merge PDFs for free?
Yes, with no limits, watermarks or signups.
Can I reorder pages?
Yes — drag the file list into the order you want before merging.
Does it work on a phone?
Yes on modern phone browsers, though large files may be slow on low-memory devices.
Fun facts about PDF Merger
- PDF (Portable Document Format) was created by Adobe in 1993 and became an open standard (ISO 32000) in 2008.
- A PDF file can contain text, images, vector graphics, fonts, 3D models, and even interactive forms — all in a single file that looks the same on every device.
- PDF grew out of 'The Camelot Project', a 1991 paper by Adobe co-founder John Warnock describing a way to share documents across any computer.
- PDF files use a cross-reference table that allows random access to any object in the file — which is why you can jump to page 500 of a large PDF instantly.
- PDF/A, an ISO standard subset for archiving, forbids features like embedded JavaScript and external font references so documents stay readable for decades.