Merge PDF files online for free, without uploading anything
Combine several PDFs into a single document and set the order of the files before joining them. Everything happens in your browser with Certyneo Reader: your files never leave your device, with no account and no limit on the number of files or pages.
Prefer an app? Download Certyneo Reader for free
The same PDF reader, installed on your computer: it opens your files offline, with no account, and can become your default PDF reader.
Does Windows show “Windows protected your PC”? That is the usual warning for a newly released app: click “More info”, check that the publisher is Certyneo, then click “Run anyway”.
Other systems and installers: macOS · Linux (AppImage) · Linux (.deb package for Debian and Ubuntu)
Windows (offline installer, MSI for managed fleets)
Windows (offline installer, x64) · Windows (offline installer, ARM64) · Windows (MSI for managed fleets)
Drop your PDF here
or choose a file on your computer, tablet or phone
Word, Excel, PowerPoint, text, RTF, images and HEIC photos are converted to PDF on your device.
100% local reading: the document is never sent over the internet.
How to merge several PDFs into one file
- 1
Open the first PDF
Drag the first file into the reader, then add the others with the "Add PDFs" button, from your computer, tablet or phone.
- 2
Put them in order
Move each file up or down with the arrows to set the final order, and remove any file you don't need in one click.
- 3
Merge and download
Click Merge: the combined PDF is ready in seconds, to save, review in the reader or send for signature.
Everything happens in your browser: the file never leaves your device. Open in the reader
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Merging PDFs online: frequently asked questions
How many PDFs can I merge at once?
As many as you like. There is no limit on the number of files or pages: the only constraint is your device's memory, which is plenty for hundreds of pages.
Are my files uploaded to a server?
No. The merge is computed entirely in your browser. Certyneo never receives, stores or looks at any of your files: closing the tab is enough to clear everything.
Are page order and quality preserved?
Yes. Pages are copied as they are, without recompression: text, images, links and bookmarks stay identical to the original, in the order you chose.
Can I merge a password-protected PDF?
Yes for the document open in the reader: its password is requested when you open it and checked on your device. PDFs you add afterwards must have no password; remove it first with the protection tool. The merged PDF keeps the password of the open document.
Does merging work on phones and tablets?
Yes. Certyneo Reader works in recent browsers on Android, iPhone and iPad as well as on a computer, with no app to install.
Does this PDF need to be signed?
Send it for electronic signature in minutes: your signers sign from their phone, without creating an account.
Get started with Certyneo for free