Free Online Engineering Tools

Combine PDF Files

Put several PDFs together into a single document — add the files, drag them into order, and download. Lossless, private, and completely free.

Add PDFs
Arrange
Save PDF

Drop your PDFs here

or click to browse · add as many PDFs as you like · no file limit

Converts on your device — your PDF is never uploaded
files
pages in
pages out
total size
Drag a card to reorder · set a page range to take only part of a file
✓ Saved to your device as merged.pdf

Combine PDF Files Into One

Put several PDFs together into a single document — add the files, drag them into order, and download. No limit on how many, no account, no watermark, and nothing is uploaded: the whole job runs in your browser.

One file instead of eight. A single PDF keeps its pages in a fixed order, opens identically on every device, counts once against upload and email limits, and can be signed or printed as one job. That is why almost every portal asks for “one combined PDF”.

Why Combine Rather Than Attach Separately

Sending five separate PDFs asks the recipient to work out the order, keeps five files in their downloads folder, and multiplies the chance one gets lost. Attaching them individually also runs into per-message limits faster, since each attachment carries its own transport overhead.

A combined document solves all of that at once. It is also the only format many systems will accept: application portals, court filing systems and HR platforms routinely require a single file per submission.

Getting the Order Right

The order is the part people get wrong, and it is rarely their fault. File managers sort alphabetically, so page10.pdf lands before page2.pdf. Phone scans are named by timestamp. Sheet-fed scanners sometimes number backwards when a stack goes in face-up.

Here the document is built from the order of the cards on screen, with live numbering. Drag once, glance at the numbers, and it is right — whatever the files are called.

Take Only the Pages You Need

Each file has its own page-range box, so you can pull pages 4–6 out of one document and combine them with another without splitting anything first. Type 4-6, leave the others empty for whole documents, and the counters show exactly how many pages the finished file will contain.

Frequently Asked Questions

How do I combine PDF files into one?

Add all the files, drag them into the order you want, and press Merge. Each becomes part of a single document, in the sequence shown on screen. There is no limit on how many you combine.

What is the difference between combining and merging?

Nothing - they are two words for the same operation. Some tools say combine, others say merge, and a few say join. All of them mean putting several PDFs into one file.

Can I combine PDFs on a phone?

Yes. The tool runs in mobile browsers on both iOS and Android, which is convenient because scanned documents are usually already on the phone that photographed them.

Can I combine PDFs with images?

Not on this page - it takes PDFs only. To combine photos or scans into a PDF, use the images-to-PDF tool, then bring the result back here if you also need to attach it to an existing document.

How many files can I combine at once?

As many as you like. Some well-known tools cap free users at twenty files; there is no cap here because the work happens on your own device.

Will combining change the page sizes?

No. Every page keeps its own dimensions and orientation, so mixing A4, Letter, portrait and landscape in one document works exactly as expected.

Is the combined file uploaded anywhere?

No. The documents are read and combined inside your browser and never leave your device.

Do I need to install anything?

No. It is an ordinary web page - nothing is installed, no account is created and no admin rights are needed.

Related: Merge PDF (all options) · Merge without uploading · Combine images into a PDF · Compress the result