Concatenate multiple PDF documents into a single organized file with intuitive drag-and-drop reordering and instant client-side compilation.
All formatting, parsing, decoding, and validation executes entirely within your browser using modern Web APIs and JavaScript. Your tokens, JSON payloads, regex inputs, and queries never leave your computer.
Merging separate PDF invoices, contract annexes, project deliverables, and presentation handouts into a unified document is an everyday necessity for engineering, legal, and operational teams.
DevRef's Online PDF Merger utilizes pdf-lib WebAssembly binaries inside your web browser. You can upload multiple PDFs, drag cards to rearrange their order, inspect page counts, and assemble the final master document with one click. Everything executes locally in browser memory—your contracts, financial records, and proprietary specifications are never uploaded to any remote server.
No. The concatenation and binary rewriting runs entirely inside your browser's JavaScript environment. Zero PDF data is transmitted across the network.
Yes. Each page preserves its individual native geometry and orientation within the merged output document.
No practical limit. You can combine dozens of files up to the memory limit of your browser tab.