How to merge PDF files

Combine your files in four steps

Everything happens on the page you already have open. There is no install, no account, and no queue. Head to the free Merge PDF tool and work through the sequence below:

1. Open the Merge PDF tool in any modern browser.
2. Click Select PDF files or drag two or more PDFs into the drop zone.
3. Use the up and down arrows beside each file to arrange them top-to-bottom in reading order.
4. Press Merge PDF, wait a moment while the files are stitched together, and save the single combined document.

You can combine up to 30 files in one go, with each individual PDF up to 100 MB and a combined ceiling of 200 MB. Those numbers exist because the assembly runs on your own processor and memory rather than a remote machine, so the limits keep the tool snappy even on a phone.

Situations where one file beats five attachments

A job application is the classic example: a hiring portal that accepts a single upload will happily take one PDF containing your cover letter, CV, and reference letters in that exact order, where three separate files would force the reader to juggle downloads. Accountants and freelancers lean on merging at tax time, folding a month of scanned receipts into a single expense pack. And anyone returning a signed agreement can reunite the pages they printed, signed, and re-scanned with the untouched pages from the original contract, so the counterparty receives one coherent document instead of a jigsaw.

What actually happens to the pages

Merging is not a screenshot or a re-print. Each source PDF is parsed and its page objects (the text streams, embedded fonts, and vector or image content that make up every page) are copied wholesale into a new, empty document, and appended to that document's page tree in the order you set. Because the underlying objects travel across intact, selectable text stays selectable, fonts keep their hinting, and diagrams stay as crisp vectors rather than being flattened to pixels. The result is a genuinely new file whose page count is the sum of its parts.

Keeping sensitive combinations to yourself

The files people merge are often the ones they would least like on a stranger's server: pay slips beside a mortgage form, medical letters bound into one referral, ID scans clipped to an application. Since this merger executes purely as JavaScript inside your tab, none of those documents are transmitted anywhere; they are read into memory, joined, handed back as a download, and discarded the moment you close the page. If you want the longer explanation of what "in-browser" really guarantees, our note on whether online PDF tools are safe walks through it.

Frequently asked questions

How many PDFs can I merge at once? Up to 30 files per job, capped at 100 MB each and 200 MB combined, comfortably enough for most reports, portfolios, and receipt bundles.

Will there be a watermark or a sign-up wall? Neither. There is no branding stamped on the output, no email to hand over, and no cost.

Can I merge password-protected PDFs? Not while they are still encrypted. Remove the password in your PDF reader first, then add the unlocked file, a small safeguard against accidentally combining documents you are not entitled to open.

Does the tool work on a phone? Yes. It runs in mobile Chrome, Safari, and other current browsers, though very large files may take longer on older handsets because the work uses your device's own memory.

Can I rearrange pages within a single file, not just between files? Merging orders whole files; to shuffle individual pages, merge first and then open the result in the reorder tool.

Related tools

Merging pairs naturally with a few of its opposites: use Split PDF to break a combined file back apart, Reorder Pages to fine-tune the sequence page by page, or Rotate PDF if a scanned insert landed sideways.