How to Combine PDF Files for Free: 5 Methods for Any Device

You have two PDFs that need to become one — and you don’t want to pay for Adobe Acrobat Pro. Good news: you probably already have free tools on your computer, since the PDF format, introduced in 1993 (Wikipedia (reference standard) — 1993), was designed for portability, not editing, but merging them doesn’t have to be a puzzle.

Year PDF format introduced: 1993 · Free online merge file count limit (typical): Up to 20 files · Native OS tools available: Windows (Word), Mac (Preview), Linux (pdftk) · Top free online merger: iLovePDF, Adobe Acrobat online

Four key metrics side by side: what each free method handles best.

How do I combine two PDF files into one PDF?

Using Adobe Acrobat online free tool

Adobe’s free online merge tool supports up to 20 files and runs in any modern browser. No login required. Drag files, reorder, click “Merge” — the result downloads as a single PDF with no watermark (Foxit (PDF software provider) — online merge steps). The 2 GB file limit covers most real‑world usage. This is the simplest path for anyone who can upload files to a web service.

Using iLovePDF drag-and-drop

iLovePDF offers unlimited free merges with a 100 MB per file cap. The interface is drag‑and‑drop, and you can reorder pages before merging. No watermarks and no registration required (iLovePDF (free PDF service) — merge page). The tool works identically on Windows, Mac, Linux, and mobile browsers.

Using Mac Preview’s thumbnail view

Apple Support explains that Preview on Mac lets you combine PDFs without extra software: open both PDFs, enable View > Thumbnails, then drag thumbnails from one document into the other (Apple Support (official documentation) — thumbnail method). You can also drag the PDF icon from Finder directly into an open Preview document. Save via File > Export as PDF.

This makes Preview the best choice for privacy-conscious Mac users.

How do I merge PDF files for free?

Best free online mergers

Beyond Adobe and iLovePDF, PDFChef (free online tool) and Foxit’s online merger also offer free, no‑sign‑up merging. PDFChef lets you delete or rotate pages before saving (PDFChef — page editing features). All four services produce a watermarked‑free final document.

Using Microsoft Word as a free desktop method

If you have Microsoft Word (Windows or Mac), you can combine PDFs without leaving the app. Go to Insert > Object > Text from File, select your PDF, and Word inserts its content as editable text. The catch: formatting (fonts, columns, images) may shift (Microsoft Community (support forum) — Word PDF import). For simple text‑based PDFs, it’s fast and free.

How to merge multiple PDF files without Adobe

Using Microsoft Word (Windows)

The same Word trick works for multiple files: open a blank document, repeat Insert > Object > Text from File for each PDF. Pages will be appended in the order you insert them. A CNET (tech publication) tested method also uses the free PDF Merger & Splitter app from the Microsoft Store. Open the app, choose Merge, add your PDFs, and save the combined file.

Using Apple Preview (Mac)

Preview’s drag‑and‑drop works for more than two files. Open the first PDF, enable thumbnails, then drag the entire second PDF from Finder into the sidebar. Repeat for each file. Apple Support notes you can Command‑click to select non‑adjacent pages before dragging (Apple Support — multi‑page selection).

Using free third-party software (PDFsam, pdftk)

PDFsam (PDF Split and Merge) is a free, open‑source desktop tool for Windows, Mac, and Linux. It preserves original quality and works offline. pdftk is a command‑line tool popular on Linux. Both avoid online uploads entirely (PDFsam (open-source project) — official site).

Does Microsoft have a PDF merge tool?

Using Microsoft Word to combine PDFs

As noted, Word is the closest Microsoft comes to a built‑in PDF merger. The Insert > Object method works, but Microsoft Support warns that complex formatting may not survive (Microsoft Community — formatting limitations).

Using the new Microsoft Edge PDF reader (limited)

Microsoft Edge’s built‑in PDF viewer can open and annotate PDFs, but it has no merge function. You can print multiple PDFs to a single file using “Microsoft Print to PDF” — a workaround, not a dedicated tool.

Therefore, for reliable merging on Windows, users should choose an online tool or third-party app.

How to combine PDF files on mac

Using Preview’s thumbnail drag-and-drop

Already covered — it’s the fastest zero‑cost method on macOS. The YouTube (video demonstration) — Preview merge shows the workflow: open PDF A, open PDF B, drag the thumbnail of B into A’s sidebar, then export.

Using Automator actions

Foxit describes an Automator workflow: create a new Workflow, add the “Combine PDF Pages” action, drag in your files, and run. This batch‑processes multiple PDFs without opening each one.

Using third-party apps

PDF Expert (paid) and Adobe Acrobat for Mac offer more control, but the free Finder Quick Actions trick also works: select multiple PDFs in Finder, right‑click, Quick Actions > Create PDF. The resulting file order depends on your selection order.

Five free online tools, one pattern: all are browser‑based, no installation, but privacy policies vary.

Step-by-Step Guide: How to Combine PDF Files on Any Device

1. Choose your method – Decide between online (any device) or offline (privacy). For sensitive docs, use Preview (Mac) or Word/PDFsam (Windows).
2. Prepare your files – Gather all PDFs in one folder. Name them in merge order (e.g., 01_intro.pdf, 02_body.pdf).
3. Online method – Go to Adobe Acrobat online or iLovePDF. Click “Select files,” upload in order, click “Merge,” download the result.
4. Mac method – Open Preview, enable thumbnails (View > Thumbnails), drag PDFs from Finder into the sidebar. Save as PDF.
5. Windows method – Open Word, Insert > Object > Text from File for each PDF. Save as a new PDF (File > Save As > PDF).
6. Verify – Open the combined PDF to check page order and formatting. Re‑open if needed.

“Right now, my strategy is to print them and scan them into one file.”

Reddit user in r/pdf, describing a workaround for merging PDFs without software (Reddit (community discussion))

“I used Word’s Insert Text from File to merge PDFs on Windows — it worked but the formatting was weird.”

Microsoft Community forum participant, sharing experience with the Word method (Microsoft Community)

For any macOS user who handles sensitive documents, the choice is clear: use Preview’s offline drag‑and‑drop — it preserves quality and privacy. For Windows users who need reliable formatting, an online tool like Adobe Acrobat or iLovePDF is faster than Word’s import. And for Linux users, pdftk or PDFsam keep everything local. The free path exists on every platform — you just have to know where to look.

If you need to combine PDF files for free, this guide covers five methods that work on any device.

Frequently asked questions