Home Merge Pdf

Seamlessly Combine Your Documents

Join multiple PDF files into one professional document in seconds, without ever uploading your files to a server.

Drag & Drop PDF files here

or click to select files from your computer

Privacy-First PDF Merging

Managing multiple documents can be a challenge, especially when security is a priority. OncePDF's Merge tool allows you to combine any number of PDF files into a single, organized document using local processing. This means your files are joined together directly on your computer, eliminating the risk of data leaks associated with traditional cloud-based mergers. Our intuitive interface makes it easy to drag and drop files, reorder them as needed, and generate your combined PDF instantly. It's the perfect solution for organizing project files, consolidating financial reports, or creating comprehensive portfolios while keeping your data strictly in your hands.
Safe Transfers Instant Combine No Registration

Why Seamlessly Combine Your Documents with OncePDF?

Managing multiple documents can be a challenge, especially when security is a priority. OncePDF's Merge tool allows you to combine any number of PDF files into a single, organized document using local processing. This means your files are joined together directly on your computer, eliminating the risk of data leaks associated with traditional cloud-based mergers. Our intuitive interface makes it easy to drag and drop files, reorder them as needed, and generate your combined PDF instantly. It's the perfect solution for organizing project files, consolidating financial reports, or creating comprehensive portfolios while keeping your data strictly in your hands.

How to join your PDF's

  • Select Files: Grab your files and drop them in the box above, or just click to browse your folders.
  • Check the Order: You'll see a quick preview for each file. It's good to double check the order before you commit.
  • Click Merge: Hit the "Merge" button and our code will piece it all together for you.
  • Download: Your combined file is usually ready in just a few seconds, nice and easy.

Is it safe? (Yes.)

We get it—document security is a big deal. That's why we're pretty obsessed with it. All file transfers use strong encryption, and we never keep your files longer than we absolutely have to. Anything uploaded for processing is cleaned out of our system every hour.

We don't read your stuff, we don't keep "backups," and your data isn't our business. What you do with your documents is entirely up to you.

Why you'll love this tool

Total Organization

Finally keep your related files together so they don't get lost in your downloads folder.

Professional Sharing

Sending one file looks a lot cleaner than five attachments in one email.

Ready to Print

Perfect for when you need to print a bunch of documents in a specific order.

Frequently Asked Questions

Common questions about merge pdf and how it works.

How many PDF files can I merge at once?

You can merge up to 20 PDF files at a time for free. Pro users can merge up to 100 files.

Is there a file size limit for merging?

Yes, each file should be under 50MB. The total merged file size should not exceed 200MB.

Will my files be saved on your server?

No, we take privacy seriously. All files are automatically deleted from our servers after 1 hour.

Still have questions? Our support team is here to help you.

Contact Support