How to Merge PDF Files

Combine several PDFs into one clean, correctly ordered document.

Applications, reports, and contracts rarely live in a single file: there is the main document, the signed page, the ID scan, the appendix. Merging them into one PDF makes the package easier to send, store, and read. The Merge PDF tool does it in your browser — you choose the files and their order, and the combined document is built locally on your device. Nothing is uploaded.

Before you start

Two minutes of preparation saves a re-merge later. Give the files clear names first — 01-application-form.pdf, 02-id-scan.pdf, 03-certificate.pdf — so the intended reading order is obvious at a glance. Open each file once to confirm it is complete and is the final version. Note that password-protected PDFs cannot be opened by browser tools; remove the password with the app that created the file before merging.

Step by step

  1. Add your files. Open Merge PDF and add every PDF you want to combine. They are read locally in your browser and never uploaded.
  2. Arrange the order. Put the files in the exact order the finished document should read: main document first, then supporting pages and appendices. This order is the single most important step — the tool merges in the sequence you set.
  3. Merge. Press the merge button. The tool assembles one PDF from your files, in your order.
  4. Download. Save the combined PDF with a clear file name that describes the whole package.
  5. Read it through. Open the merged file and scroll from the first page to the last. Check that nothing is missing, nothing is duplicated, and the pages flow in the order a reader expects.

Working on a phone

Merging works on phones too, because the processing happens in the browser rather than on a server. Two things make it smoother: keep the total size of the files modest — very large scans use a lot of the phone's memory — and close other heavy tabs before you start. If a merge seems stuck, it is almost always a memory limit rather than an error; try again with fewer or smaller files, or use a computer for that one job. The merged result downloads like any other file and can be shared straight from the downloads folder.

Finishing touches

A merged document often benefits from two quick passes. Page numbers make a long combined file far easier to navigate and to reference in an email ("see page 7") — the Add Page Numbers tool stamps them on in your browser. And if the merged file has grown large because it contains scans or photos, run it through Compress PDF afterwards; image-heavy documents usually shrink a great deal. Need the opposite operation later? Split PDF pulls a merged file back apart into pages or ranges.

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