Merge PDF joins any number of PDF files into a single document. Add the files, drag them into the order you want, and the merged file follows that order top to bottom. Each file also has a page box, so you can take pages 1-3 from a contract, page 7 from an invoice and every odd page of a scan, all into the same output. Pages keep the size and rotation they had, so an A4 report and a landscape spreadsheet sit side by side at their original dimensions rather than being squashed to a common page size. Nothing is re-encoded: the text stays selectable, images keep the quality they arrived with, and fonts travel with the pages that use them.
The guide behind this tool
Merging PDFs: What Comes Through and What Quietly Disappears
A merge copies pages, not documents. Text and images arrive untouched; bookmarks, form fields and signatures do not, and the reason is in the file format.
Drop your PDFs onto the box, or click it and select several at once. Each one appears as a row showing its first page, its page count, its size and its paper format.
Drag the rows by the handle on the left, or use the arrows, until the order matches the document you want.
Click the page image on any row to open that file full screen and step through it, which is the quickest way to find the page numbers you want.
To take part of a file, click its page button and type a selection: 1-3, 7, 11-14, or odd, or even. Leave it blank to keep the whole file.
Name the output, then press the merge button. The file downloads straight away and stays available for a second download.
Thirty files at a time, each up to 100 MB. The real ceiling is your device's memory rather than the count, since every file has to be held open while the merge runs. If a very large batch stalls, merge it in halves and then merge the two halves.
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