The Complete Guide to Merging PDFs
What does merging PDFs mean?
Merging PDFs means combining two or more separate files into a single PDF document. You can merge PDFs together, or mix PDFs with images — JPEG, PNG, WebP, HEIC (iPhone photos), AVIF, and more. All pages are joined in the order you choose, producing one unified PDF that is easy to share, print, or archive.
This is the opposite of splitting. Where splitting breaks one PDF into parts, merging assembles multiple files into a whole. Images are automatically converted to PDF pages at your chosen size. The original files are never altered — merging always creates a new combined file.
How the pdfcut.app merger works
When you add files to pdfcut.app, each one is read by your browser's JavaScript engine. PDFs are read directly, while images (JPEG, PNG, WebP, HEIC, AVIF, etc.) are converted to PDF pages automatically — centered on A4, Letter, or fit-to-image size. You can reorder everything by dragging files into the sequence you want. When you click merge, the tool combines all pages into a single new PDF. The entire process runs client-side — there are no uploads, no server processing, and no waiting.
Common use cases
- Combining separately scanned pages into a single document — for example, merging a signed cover page with the rest of a contract.
- Assembling a complete application package from multiple PDFs: resume, cover letter, references, and certificates into one file.
- Joining monthly reports or statements into a single annual document for archiving or review.
- Combining iPhone photos, screenshots, or scanned images with existing PDF documents into a single file — for example, adding a photo of a signed page to a contract PDF.
Tips for better results
- Arrange your files in the correct order before merging. The final PDF follows the exact sequence shown in the file list.
- If you only need certain pages from one of the source PDFs, use the Split tool first to extract those pages, then merge the result with your other files.
- You can mix PDFs and images freely. Drop photos from your phone alongside PDF documents — each image becomes its own page. Use the gear icon on image rows to choose A4, Letter, or fit-to-image page sizing.