Why Merge PDFs?
Sending one file is always better than sending five. A single merged PDF is easier for the recipient to open, easier to file, and far less likely to result in a missing attachment. It's also the professional standard for job applications, legal submissions, client reports, and anything else where presentation matters.
The challenge has always been that merging PDFs used to require expensive desktop software. Not anymore — here are five ways to do it, starting with the simplest.
Use a Free Online Tool (Fastest)
The quickest approach is dragging your files into a browser-based tool. AllPDFStuff's Merge PDF tool lets you drop multiple PDFs at once, and they're combined and ready to download within seconds. No software, no account required for the basic function — and files are deleted after 1 hour for privacy.
Use Preview on Mac (Built-in, Free)
If you're on a Mac, you already have a PDF merger built in. Open your first PDF in Preview, then go to View → Thumbnails to see the page panel on the left. Drag additional PDF files directly into that panel, reorder pages by dragging, then go to File → Export as PDF to save your merged file.
Print to PDF on Windows (Built-in, Free)
Windows doesn't have a dedicated PDF merger, but you can combine PDFs using the built-in Microsoft Print to PDF feature. Open each PDF in Edge browser, select all pages, and print them together to a new PDF. It's a workaround rather than a proper merge, but it works for simple documents.
Use Adobe Acrobat (Most Powerful, Paid)
Adobe Acrobat's Combine Files feature is the industry standard — you can merge PDFs, reorder individual pages, add or remove specific pages, and control the output quality. The downside is the cost: Acrobat requires a subscription that starts at around $15–20 per month, which is hard to justify if merging PDFs is an occasional task.
Use Google Drive (Free with a Google Account)
If you use Google Drive, you can install a free add-on called PDF Merge from the Google Workspace Marketplace. Upload your PDFs to Drive, select them, right-click and open with PDF Merge, then download the combined file. It's a few more steps than a dedicated tool but works well if you're already in the Google ecosystem.
Which Method Should You Use?
The right choice depends on how often you merge PDFs and what device you're on:
- Occasional merging on any device — use a free online tool like AllPDFStuff
- Mac user who merges regularly — Preview is built in and excellent
- Windows user, basic needs — Print to PDF works in a pinch
- Professional use with editing needs — Adobe Acrobat is worth it
- Already in Google Workspace — Drive add-on is a solid free option
💡 Pro tip: When using AllPDFStuff to merge PDFs, drop all your files at once — the tool will automatically order them alphabetically. Name your files with numbers at the start (e.g. 01-intro.pdf, 02-main.pdf) to control the merge order easily.
Common Merging Mistakes to Avoid
Even a simple task like merging PDFs has a few pitfalls to watch out for:
- Wrong page order — Always check the order before merging. Once combined, splitting them back out is extra work.
- Different page sizes — If your PDFs have mixed page sizes (e.g. A4 and Letter), the merged file may look inconsistent. Standardise sizes first if presentation matters.
- Password-protected PDFs — Most tools can't merge locked PDFs. Use AllPDFStuff's Unlock PDF tool first to remove protection, then merge.
- Keeping originals — Always keep your original separate files. You might need to reorder or re-merge later.
Merge your PDFs now
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Merge PDFs free →Related Tools
- Merge PDF — Combine multiple PDFs into one file
- Compress PDF — Shrink your merged PDF's file size
- Split PDF — Extract specific pages from a PDF