Drag & Drop PDF Files Here
or click to select files
What is ZyncPDF?
ZyncPDF is an open-source, privacy-first suite of powerful PDF tools built for speed, simplicity, and total user control. We believe your documents should stay yours — always. Every operation in ZyncPDF happens directly inside your browser, meaning your files never leave your device. With no uploads, no tracking, no ads, and no registration, ZyncPDF provides a smooth, secure, and 100% private experience for all your PDF tasks — from converting and merging to compressing and editing.
Why use our Flatten PDF tool?
- Embed Interactivity: Permanently converts form fields and annotations into static page content.
- Accurate Appearance: Automatically generates appearances before flattening for consistent rendering.
- Private & Secure: 100% client-side processing with WebAssembly. Files never leave your device.
- Ready to Share/Archive: Prevents further edits to form fields and comments.
How to use the Flatten PDF tool:
- Step 1: Drag and drop your PDF(s) into the upload area, or click to select.
- Step 2: Click "Process Files" to flatten.
- Step 3: Download your flattened PDF(s).
Frequently Asked Questions (FAQ)
All annotations and form fields are flattened into static page content using qpdf defaults (generate appearances and flatten all annotations).
No. Flattening is permanent. Keep a backup of your original PDF if you may need editable fields later.
Yes. Processing happens entirely in your browser. We never upload or collect your files.