Merge PDF Files

Merge PDF combines any number of separate PDF files into a single document, in the order you upload them — a set of scanned receipts, a contract and its signed addenda, or a stack of chapters that need to read as one file. Under the hood it doesn't rasterise or re-render anything: each source file is opened, and its pages are copied directly into a new document one file at a time, so text stays selectable, links stay live, and image quality is exactly what it was in the original — there's no lossy re-encoding step anywhere in the pipeline.

The process is intentionally simple, because merging is one of the most common first steps in a longer document workflow and shouldn't require reading instructions to use: pick your files, check the order, and get one PDF back. There's nothing to configure beyond which files go in and what order they merge in — no compression settings, no page-size normalisation options, and no separate confirmation step. That simplicity is deliberate; the tool does exactly one job, and does it the same way whether you're combining two short letters or fifty scanned pages of a case file.

There's no separate "reorder" step before merging, because the order is simply the order you added the files in — drop them in the sequence you want the final PDF to read, and if you upload one out of place, remove it with its × button and add it back in the right spot rather than dragging it into position. There's also no cap on how many files or pages you can combine; a merge of fifty files behaves the same as a merge of two, limited only by how much your device's memory can hold at once, which for ordinary documents is more than enough.

It's worth knowing what merging doesn't do, so the result isn't a surprise: pages come across exactly as they were in each source file, so if your files have inconsistent page sizes or orientations, the merged PDF will too — nothing is resized or rotated to match. If you need the pages themselves rearranged after merging rather than just the file order changed, Reorder Pages picks up from there and lets you drag individual pages, not whole files, into any order.