Merge PDF files
Combine multiple PDFs into one — in order, in seconds, offline.
Processed on your device — nothing is uploaded. Works offline.
Don't trust us — test us
Load this page, then turn off your wifi. The tool keeps working, because your file is processed by your own browser — there is no server involved and nowhere to upload to. How to verify this yourself →
Frequently asked questions
How do I change the order of the merged files?
Drag files up or down in the list before merging, or use the arrow buttons. The output follows the list order exactly.
Are my files uploaded to a server?
No. All processing happens inside your browser using WebAssembly and JavaScript. Our server only serves the app itself — there is no endpoint that can receive files. You can verify this in your browser's network tab, or turn off your wifi after the page loads: everything still works.
Is there a file size limit?
No hard limit — your device's memory is the ceiling. Files up to a few hundred MB work well on a typical laptop. Very large files may be slow or fail on low-memory devices; nothing is ever truncated silently.
Do I need to create an account?
No. No account, no email, no cookies. The free tools are simply free.