Best 5 Free, Online PDF Merging Tools in 2025
Introduction
Are you looking for a tool to combine multiple PDFs into one? Many free tools out there are either slow, cluttered, or filled with ads. Finding one that’s fast, user-friendly, and truly free isn’t easy. You shouldn’t have to register just to merge a few files. In this blog, we explore the top five free, online PDF merging tools that are simple, effective, and don’t require any sign-up.
Things to Consider Before Selecting a PDF Merging Tool
To choose a free tool to merge PDFs, a user should consider the following criteria:
- No Forced Sign-Up: The best tools let you get started instantly—no accounts, no email traps, just merge and go.
- Secure File Handling: Your documents should be processed securely, never stored on a server or deleted automatically after use.
- Easy to Use: Look for an intuitive interface with drag-and-drop functionality, clear steps, and zero learning curve.
- Generous Limits: A useful tool won’t cap your uploads with tiny file size or page count restrictions.
- Advanced Page Control: Being able to re-arrange, rotate, delete, or preview pages before merging adds real flexibility.
- No Watermarks: A truly free tool won’t slap a watermark on your final document.
A Side-by-Side Comparison: Top 5 Free PDF Merge Tools
The following table compares different free tools’ features and usability.
| Feature | BoldSign | Smallpdf | PDF24 | PDF.io | PDF Converter |
|---|---|---|---|---|---|
| Use tool without sign-up? | Yes | Yes | Yes | Yes | Yes |
| Add files between pages | Yes | Yes | No | No | No |
| Unlimited document merges | Yes | Yes (pro only) | Yes | Yes | Yes (unlimited with sign-up) |
| Change page order | Yes | Yes | Yes | Yes | Yes (via splitting) |
| Sort files (A–Z, Z–A) | Yes | No | Yes | No | No |
| Rotate specific pages | Yes | Yes | Yes (limited) | Yes | Yes (via splitting) |
| Duplicate specific pages/files | Yes | Yes | No | No | No |
| Delete specific pages/files | Yes | Yes | Yes | Yes (files only) | Yes |
| Preview final document | Yes (before merge) | Yes (after merge only) | Yes | No | No |
| View pages | Yes | Yes (pro only) | Yes | Yes | Yes (via splitting) |
| File view mode | List and grid | List and grid (screen-dependent) | List and grid | Grid only | Grid only |
| Security | Client-side only. No uploads or storage. | Server-side. Deleted after 1 hr. | Server-side. Deleted after 1 hr. | Server-side. Deleted after 12 hrs. | Server-side. Deleted after 3 hrs. |
| File size limit | No strict limit (250 MB+ supported) | 200 MB (free tier) | 500 MB | No limit | No limit |
| No watermark on final file | Yes | Yes | Yes | Yes | Yes |
| Password-protected PDF support | No | Yes | No | Yes | No |
| Ease of use | Intuitive & modern UI | Easy to use | Simple | Basic interface | Easy to use |
| Best for | Secure, advanced merging | Cloud-based merging | Large-file merging | Multi-source merging | Simple, versatile merging |
Security and Privacy Considerations
Why Security Matters
When merging PDFs online, security is crucial—especially for sensitive documents like contracts or financial records. Many free tools process files on remote servers, which can increase the risk of data breaches or unauthorized access. Users should ensure that the tool they choose either processes files entirely on the client side (with no uploads), or, if server-based, has strict deletion policies with short retention times.
Best Practices for Security and Privacy
- Choose Client-Side Processing: Prefer tools that handle files locally, so nothing is uploaded to a server.
- Check Deletion Policies: Ensure server-based tools delete uploaded files immediately or within a short timeframe.
- Use Secure Connections: Always merge PDFs over HTTPS to protect your data during transmission.
- Avoid Uploading Sensitive Data: Redact private information before using server-side tools.
- Verify the Tool’s Reputation: Check the provider’s privacy policy and user reviews to confirm it’s trustworthy.
How BoldSign Ensures Security
BoldSign’s free PDF merger uses client-side processing only—your files never leave your device. This eliminates the risk of data exposure on external servers and ensures total control over your documents. Combined with a strong privacy policy, this makes BoldSign one of the safest options available.
The BoldSign PDF merger:
- Is a 100% free tool.
- Requires no sign-up or commitment to use.
- Adds no watermarks to your final PDF.
- Works on any device with unlimited usage.
Conclusion
Free, online PDF merging tools make document management fast and easy. BoldSign stands out as a top choice thanks to its secure, user-friendly design, client-side processing, and powerful merging features like page reordering—all with no sign-up required. Whether you’re a student, professional, or small business, BoldSign helps you merge PDFs effortlessly while keeping your data safe.
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