5 Best Tools to Merge PDF Files in 2025 (Free & Paid)

You need to combine a cover letter with a portfolio, attach a signed contract to a proposal, or merge 10 reports into one master document. Merging PDFs sounds simple — but choosing the wrong tool means uploading sensitive files to a random server, hitting daily limits, or paying for features you don't need.

Here are the 5 best PDF merging tools in 2025, ranked by use case so you can pick the right one in 30 seconds.

Quick comparison

Tool	Price	Uploads Files?	Best For
PDFHub Free	Free	No	Fast, private, everyday use
Adobe Acrobat	~$20/mo	Yes	Professionals, complex merges
Smallpdf	~$12/mo	Yes	Teams, cloud workflows
PDF Candy	Free / Paid	Yes	Desktop, Windows users
Preview (Mac)	Free	No	Mac users, simple merges

1 PDFHub Free — Best free browser tool

PDFHub Free is the fastest way to merge PDFs without uploading your files anywhere. Drag your files in order, click Process, and download the merged result — no account, no server, no cost.

The tool handles unlimited files per merge and works on any browser or device. Since processing happens locally in your browser, documents with sensitive content (contracts, financial data, medical records) stay completely private.

• 100% free, no daily limits
• Files never leave your device
• Works on desktop, tablet and mobile
• No account or sign-up required

2 Adobe Acrobat Pro — Best for professionals

Acrobat's Combine Files tool is in a different league when it comes to control. You get a visual thumbnail view for reordering individual pages, the ability to merge PDFs with Word, Excel and image files in one operation, and full document properties after merging.

For lawyers assembling case files, agencies putting together proposals with multiple file types, or anyone who needs precise page-level control over the merged output — Acrobat is the professional standard.

3 Smallpdf — Best for teams

Smallpdf's merge tool integrates directly with Google Drive and Dropbox, so teams can pull files from cloud storage without downloading them first. The free tier includes daily limits; Pro removes them and adds team workspaces and sharing features.

If your team manages documents collaboratively — each person sending their section for a combined report, for example — Smallpdf makes the workflow noticeably smoother than manual file management.

4 PDF Candy — Best desktop Windows app

PDF Candy's desktop app for Windows includes a clean drag-and-drop interface with visual page reordering, batch operations and 44+ additional PDF tools bundled in. It's a one-time purchase — no subscription — which makes it appealing for users who prefer owning their software.

The online version is free with no required sign-up, though it does upload your files to their servers for processing.

5 Preview (Mac) — Best built-in option

macOS users already have a capable PDF merger built in. Open one PDF in Preview, show the thumbnail sidebar (View → Thumbnails), then drag pages from another PDF into the sidebar in the desired position. It's manual and basic — but free, private, and always available without opening a browser.

Best option for each use case

• Merging 2–10 files quickly for personal use → PDFHub Free
• Sensitive documents (legal, financial, medical) → PDFHub Free (no server upload)
• Merging PDFs with Word or Excel files → Adobe Acrobat Pro
• Team workflow with cloud storage → Smallpdf Pro
• Windows power user, one-time purchase → PDF Candy Desktop
• Quick merge on Mac with no tools open → Preview

Frequently Asked Questions

The bottom line

For the vast majority of merge tasks, PDFHub Free is the right answer — it's fast, free and doesn't touch your files. If you need page-level control or work with mixed file types, Adobe Acrobat is worth the investment. Teams collaborating on documents should look at Smallpdf.