How to use the Flatten PDF tool
- Open the tool — tap the button above; the Flatten PDF tool opens instantly, ready to use.
- Add your input — tap the upload area and pick your PDF (or fill in the form fields for generator tools), then set any options you need.
- Download the result — hit Process and your result is ready in seconds, straight from your browser.
Why use PDFPremium.pro?
Unlike most online tools, everything here runs entirely inside your browser. Your files are never uploaded to a server, which makes it both faster and far more private — what's on your device stays on your device. There are no sign-ups, no watermarks, and no hidden "premium" limits. It works on mobile and desktop, even on slower internet connections, because nothing needs to travel to the cloud.
Frequently asked questions
Why flatten a PDF?
Flattening locks filled form fields and comments in place so they cannot be edited or accidentally moved after sharing.
Is this tool really free?
Yes — completely free with no hidden limits, watermarks, or sign-up. The site is supported by light advertising.
Are my files uploaded to a server?
No. Everything runs inside your browser using JavaScript — your files never leave your device, ever.