Merge PDF FilesRight in Your Browser

Merging PDFs is the everyday glue of paperwork: a contract plus its signed signature page, a batch of receipts for one expense report, scanned chapters into a single readable document, an application form with its supporting documents in the order the portal expects. One combined file is easier to send, easier to review and impossible to deliver half of.

This tool merges at the page level, which is the lossless way to do it: pdf-lib copies each page object — with its fonts, images, vector graphics and links — straight into the new document. Nothing is rasterized, recompressed or re-rendered, so a 300-page merge is quick and the output pages are bit-faithful to their sources. Files combine in the order shown in the list, and the arrow buttons let you rearrange before merging.

Two practical notes. First, page sizes are preserved per page, so merging A4 scans with US-Letter documents is fine — each page keeps its own dimensions, exactly as the PDF standard intends. Second, interactive form fields are flattened out of scope for now: if a source PDF is a fillable form, fill and save it before merging.

The files people merge — contracts, statements, medical records, applications — are usually the most sensitive documents they handle, and traditional merge sites upload every one of them to a server. Here the merge runs entirely inside your browser: you can watch the network tab stay silent while it works, or run it in airplane mode.