Merge PDF Files Free Online

Drag and drop multiple PDF files and merge them into a single document directly in your browser. No upload, no server, 50 MB limit. Free and 100% private.

The merge happens entirely in your browser using pdf-lib, an open-source library — no file is ever uploaded to a server. Drag your PDFs into the drop zone, reorder them as needed, then download the merged document. The combined file size limit is 50 MB. Useful for assembling invoices, report chapters, or scanned forms.

🔒 100% local — your files never leave your browser

Merge PDF

Combine your documents into a single file, quickly and privately.

Drag your PDFs or click to select

PDF only. Max 50 MB total.

Frequently asked questions

Is the PDF merge tool free?: Yes, completely free with no limit on the number of merges.
Are my PDF files uploaded to a server?: No. Merging happens entirely in your browser using pdf-lib. Your files never leave your device.
Is there a file size limit?: The combined size of all selected files must not exceed 50 MB.