All merging is done in your browser. Your PDFs are never uploaded.
Yes, completely free. Merge up to 20 PDFs (20MB each, 50MB total) with no sign-up. All processing happens in your browser.
No. Your PDFs never leave your device. Merging happens entirely in your browser - no uploads, no server processing.
Use drag and drop on the file list to change the order, or use the up/down arrow buttons. The merged PDF will follow the order shown in the list.
Merging can fail if a PDF is corrupted, password-protected, or in an unsupported format. Try opening the PDF in a viewer first to confirm it is valid.