Why You Need an Online PDF Merger in 2025
Managing multiple PDF files can quickly become overwhelming, especially when you need to share or organize documents. Whether you’re working with contracts, reports, or eBooks, merging PDF files into one document makes sharing and storage easier. Instead of sending several individual files, you can send a single merged PDF that’s quicker to manage and more professional.
In 2025, online tools for merging PDFs have made this process faster and more accessible than ever. You no longer need to download bulky software to combine PDF documents. With just a few clicks, you can merge PDF files online for free, saving time and reducing hassle. Whether you’re handling business documents, personal files, or anything in between, knowing how to merge PDF documents is a simple and effective way to improve your workflow.
Key Features to Look for in a Free PDF Merge Tool
When choosing a free PDF merge tool, there are several important factors to consider:
- Ease of Use: A simple, intuitive interface ensures that you can quickly upload and merge PDFs without confusion.
- File Size Limits: Many free tools have file size limits for uploads. Ensure the tool can handle large PDF files if needed.
- Features: Look for tools that offer extra features like rearranging pages, rotating, and adjusting margins.
- Speed: Merging PDF documents should be quick and efficient, even for larger files.
- Security: Ensure the tool you choose encrypts your files and keeps them private.
- Cloud Storage Integration: If you work in the cloud, the ability to integrate with platforms like Google Drive, Dropbox, or OneDrive is crucial.
Top 10 Free Tools to Merge PDF Files Online in 2025
Here are the top free tools to merge PDF files online in 2025:
1. Lumin
Lumin leads the pack as one of the best PDF editor online tools for merging PDFs. Not only can you merge PDF documents quickly, but Lumin also offers a suite of additional tools such as text editing, annotations, and e-signature features. Lumin’s cloud integration allows you to easily store and access your documents from anywhere.
Pros:
- Simple, user-friendly interface
- Cloud storage integration
- Real-time collaboration
- Secure e-signature functionality
Cons:
- Some advanced features require a paid plan
2. iLovePDF
iLovePDF is a solid choice for anyone looking for a simple way to merge PDF documents. This free tool allows users to combine PDFs, split them, and even compress or convert them into other formats. It’s widely recognized for its clean interface and efficiency.
Pros:
- Easy-to-use interface
- Can handle multiple PDFs at once
- Offers additional PDF editing tools
Cons:
- Free version limits the number of files you can merge per day
3. PDF Candy
PDF Candy is a reliable tool for merging PDF files, offering both free and paid options. Its free version allows you to merge up to 5 PDFs at a time. This tool also provides features like file compression and format conversion, making it a versatile solution for PDF management.
Pros:
- Simple drag-and-drop functionality
- Offers additional PDF tools like conversion and compression
- No registration required
Cons:
- Limited to 5 files for merging in the free version
4. Sejda PDF
Sejda PDF is an online PDF editor that allows you to merge PDF files in just a few clicks. It’s a powerful tool that also provides options for splitting, editing, and annotating PDFs. The free version of Sejda has file size limits, but it’s great for light to moderate use.
Pros:
- User-friendly and intuitive interface
- Includes additional PDF editing tools
- Secure and privacy-focused
Cons:
- File size limit in the free version
- Limited to 3 tasks per hour in the free plan
5. Smallpdf
Smallpdf is known for its simple, no-fuss approach to merging PDFs. The platform allows you to upload files directly from your computer or cloud storage, merge them into a single document, and then download or share the result. While the free version has some limitations, it’s a great option for quick, straightforward PDF merging.
Pros:
- Fast and easy to use
- Integrates with cloud storage services
- No sign-up required for basic use
Cons:
- Free version allows only 2 tasks per day
6. PDF2Go
PDF2Go is another excellent choice for those looking to merge PDFs online. With a free plan that handles basic merging, this tool also offers PDF compression, conversion, and even OCR (Optical Character Recognition) for scanned documents.
Pros:
- Handles large files (up to 100MB in the free version)
- Can compress and convert PDFs
- Features an easy-to-navigate interface
Cons:
- Limited to a small number of merges per day
7. Soda PDF Online
Soda PDF Online provides a solid platform for merging PDFs and editing them as well. It’s especially great for users who need more than just merging functionality. With a user-friendly design, Soda PDF allows users to work with multiple PDFs at once, making it easy to combine documents.
Pros:
- Comprehensive PDF tools (editing, merging, converting)
- Allows for cloud storage integration
- Intuitive user interface
Cons:
- Some features only available in the paid version
8. DocFly (PDF Pro)
DocFly, formerly PDF Pro, offers an intuitive PDF editor online that allows users to easily merge PDFs. It also supports other document functions such as file conversion and e-signature capabilities. The free plan allows basic functionality, while the premium version unlocks more advanced features.
Pros:
- Easy document management and merging
- Good for occasional users
- No registration required
Cons:
- Free version has limited features
- Premium version offers more advanced tools
9. Combine PDF
Combine PDF is a no-frills, straightforward tool for merging PDFs. The platform is as simple as it gets—just upload your documents, click “combine,” and download the merged file. If you need a basic solution, Combine PDF is the way to go.
Pros:
- Super easy to use
- No signup or software download required
Cons:
- Lacks advanced editing tools
- Only offers basic merging
10. Adobe Acrobat Online
Adobe Acrobat Online is a trusted name in PDF management, and its online PDF editor offers solid tools for merging PDF files. While the free version is limited to basic merging, Adobe’s paid plan provides a more comprehensive suite of tools, including editing, e-signature, and cloud storage.
Pros:
- Industry-leading software
- Reliable and widely trusted
Cons:
- Limited functionality in the free version
- Paid plan needed for full access
Comparison Table — Features, Limits, and Ease of Use
| Editor | Free Version Features | File Size Limit | Additional Tools |
| Lumin | Merge, edit, sign PDFs | No limit | Real-time collaboration, cloud storage, OCR, conversion tools |
| iLovePDF | Merge, split, convert PDFs | 200 MB | Conversion tools |
| PDF Candy | Merge, convert, compress PDFs | 100 MB | OCR, conversion tools |
| Sejda PDF | Merge, edit, split PDFs | 50 MB | Compression, OCR |
| Smallpdf | Merge PDFs, basic edits | 15 MB | Conversion, compression |
| PDF2Go | Merge, convert PDFs | 100 MB | OCR, compression |
| Soda PDF | Merge PDFs, basic editing | 50 MB | Conversion, annotation |
| DocFly (PDF Pro) | Merge PDFs, convert files | 50 MB | Cloud storage, e-signatures |
| Combine PDF | Merge PDFs | No limit | None |
| Adobe Acrobat | Merge PDFs, basic editing | 100 MB | Cloud storage, e-signatures |
How to Merge PDF Files Online (Step-by-Step Guide)
Here’s how you can easily merge PDF files online using most free tools:
Step 1 — Upload Your PDF Files
Start by uploading the PDF files you want to merge. Most tools allow you to simply drag and drop your files or select them from your device or cloud storage.
Step 2 — Arrange Pages in the Desired Order
Once the files are uploaded, arrange them in the order you want them merged. Some tools also let you rotate or remove pages if needed.
Step 3 — Merge and Download the Final Document
After arranging the pages, click the “merge” button, and the tool will combine your PDFs into one. Download the merged document, and you’re done!
Pros and Cons of Free Online PDF Merge Tools
Pros:
- Cost-effective: Free tools save you money on software subscriptions.
- Easy to use: Most tools have simple interfaces that don’t require special training.
- No downloads: Merge PDFs online without needing to install software.
Cons:
- File size limits: Free tools often have restrictions on the file size or number of merges.
- Limited features: Some advanced editing tools are only available in paid versions.
- Ads: Free versions may display ads, which can be disruptive.
When to Consider Upgrading to a Paid Plan
While free PDF merge tools are great for occasional use, businesses or individuals who need advanced features like unlimited file size, secure e-signatures, or advanced editing tools should consider upgrading to a paid version. Paid plans often offer additional tools, priority customer support, and a more efficient, ad-free experience.
Final Verdict — The Best Free PDF Merger in 2025
For 2025, Lumin emerges as the top PDF editor online for merging files. It offers an intuitive, powerful platform with collaboration features that most other free tools lack. Whether you need to merge PDF files quickly or collaborate with a team in real time, Lumin provides the best solution.
