Merge PDF Files Online - Combine PDFs Free & Securely

Combine multiple PDF files into a single, unified document. Drag and drop to reorder your files easily. This tool is fast, free, and processes everything securely in your browser.
Secure & Private: This operation is processed entirely in your browser. Your files are not uploaded.

Your Free PDF Combiner Tool

Upload PDFs to Merge
Select multiple PDF files. You can reorder them after uploading.

Click to upload or drag and drop

Max file size: 10MB. Accepted: .PDF, PDF

How to Combine PDFs in 3 Simple Steps

1. Upload PDFs
Click the upload area or drag and drop your PDF files. You can select multiple documents at once to begin the merging process.
2. Reorder Files
After uploading, you'll see previews of your PDFs. Simply drag and drop them into the desired order for your final, combined document.
3. Merge & Download
Click "Merge PDFs" to combine them instantly in your browser. Your new, single PDF document will be ready for immediate download.

What To Do Next With Your Merged PDF?

Compress PDF
Reduce the file size of your newly merged document to make it easier to email or store.
Organize Pages
Fine-tune your document by reordering, rotating, or deleting pages.
Edit PDF
Add text, new images, or shapes to further enhance your combined PDF.
Add Page Numbers
Add professional page numbering to keep your merged document organized.

Frequently Asked Questions

Is it safe to merge my sensitive PDF files here?

Yes, completely. One23PDF performs all merging operations directly in your browser. Your files are never uploaded to any server, ensuring your data remains 100% private and secure on your computer.

Can I reorder the PDFs before combining them?

Absolutely. After you upload your files, you can easily drag and drop the PDF previews to arrange them in the exact order you want for the final merged document.

Is there a limit to how many PDFs I can merge at once?

There is no hard limit set by our tool. The performance will depend on your browser's capabilities and the size of the PDF files you are trying to merge. For most common uses, it should work seamlessly.

Will the quality of my PDFs be affected after merging?

No, our tool is designed to combine your PDF documents without altering the quality or resolution of the original pages. The merged PDF will retain the quality of your source files.

Further Reading & Resources

The Security Risks of Using Online PDF Tools

Learn why browser-based PDF processing, like One23PDF uses, is crucial for protecting your data when managing documents online.

The Rise of Browser-Based PDF Editors: Security Meets Convenience

Explore the advantages of client-side PDF tools, emphasizing the balance of robust security features with user-friendly convenience.