Merge PDF
Combine multiple PDF files into one. Drag to reorder pages before merging. Free and private.
Drop PDF files here or click to select
Multiple files allowed — drag rows to reorder
About this tool
Merging multiple PDF files into a single document is one of the most common PDF tasks — combining scanned pages, assembling a multi-chapter document, or consolidating reports. Most desktop PDF tools that do this require an expensive subscription. This tool merges PDFs entirely in your browser using the pdf-lib library, so your documents never leave your device. Drag to reorder files before merging.
- ✅ Free to use, no sign-up required
- ✅ Files never leave your device
- ✅ Instant conversion
- ✅ Works on any browser and device
How it works
Each PDF file you add is read as a byte array in your browser. The pdf-lib library opens each document, copies all its pages into a new combined PDF document in the order you specify, and then generates the merged output file for download. No server is involved at any point.