Merge PDF
Combine multiple PDF files into one — free, no signup, processed entirely in your browser.
Your files never leave your browser. No upload, no server, nothing stored.
How to merge PDF files
- Add your PDF files by clicking or dragging them into the upload area.
- Reorder the files using the up/down arrows if needed.
- Click "Merge PDFs" — download your combined PDF instantly.
Why use Formfy's PDF merger?
Unlike server-side tools, Formfy's PDF merger runs entirely in your browser using pdf-lib. Your documents never leave your device — there is no upload, no server processing, and nothing to delete.
The merged PDF is generated locally and downloaded directly to your device. Fast, private, and completely free.
Frequently Asked Questions
Is PDF Merger free?
Yes — PDF Merger is completely free to use. No signup, no account, no subscription required. Upload your file and get your result instantly.
Is it safe to upload my PDF?
Your files are transferred over an encrypted HTTPS connection, scanned for viruses, and permanently deleted from our servers within 1 hour. We never share, sell, or use your files for any purpose other than the conversion you requested.
Do you keep my files after conversion?
No. Files are automatically and permanently deleted from our servers within 1 hour of upload. We do not store, archive, or back up any user files.
What is the maximum file size?
The maximum file size is 50MB. Most PDFs are well under this limit. If your file is larger, consider splitting it first using our free Split PDF tool.
Does it work on iPhone, Android, Mac, and Windows?
Yes — PDF Merger works in any modern web browser on any device. No download or installation required.
Do I need to sign up or create an account?
No account is required to use this tool. All 28 Formfy PDF tools are completely free and anonymous. Create a free Formfy account only if you want to collect online form responses or send documents for e-signature.
Are my PDF files uploaded to a server?
No. The merge happens entirely in your browser using JavaScript. Your files never leave your device. There is nothing to delete because nothing is ever sent to our servers.
Can I reorder the PDFs before merging?
Yes. After adding your PDFs, use the up/down arrows to reorder them. The files will be merged in the order shown.