Merge multiple PDFs into one file, or extract a page range from a PDF — all processed locally in your browser, files are never uploaded.
Both tools process your files entirely in your browser using a PDF-editing library — your documents are never uploaded to a server. Merge combines files in the order you select them; Split lets you pull out specific pages or ranges into a new PDF.
Is there a file size limit? Very large PDFs may be slower depending on your device, but there's no artificial cap set by this tool.