Combine multiple PDF files into a single unified document with drag & drop reordering.
Merging PDFs lets you combine separate documents into one cohesive file — useful for assembling reports, bundling contracts with cover letters, or consolidating lecture notes into a single reference. Instead of emailing three separate attachments, you send one clean, organized file that's easy to store and share. PDFly merges your files entirely in your browser using JavaScript and WebAssembly, so your documents never leave your device and are never uploaded to any server.
To merge, drag and drop two or more PDF files into the tool area, then arrange them in the order you want using drag-and-drop or the arrow buttons. You can reorder as many times as you like before clicking Merge. The output is a single PDF with all pages in sequence, preserving the quality and formatting of every original file. There are no file count limits and no watermarks added to the result. The merged file downloads immediately to your device as a fresh file.
This tool is ideal when you have multiple separate PDFs that belong together. If you only need a few specific pages from a large document, the Split PDF or Extract PDF Pages tools are a better fit. For combining images into a PDF, use the JPG to PDF converter instead. If your files are extremely large — hundreds of pages each — merging in smaller batches may keep the process smoother, though the tool handles substantial files well. The merge operation is fast because everything runs locally.
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