Flatten PDF Free (Make Form Fields Uneditable)
Lock interactive PDF form fields, checkboxes, and signatures into permanent read-only pages.
How to Flatten PDF
Upload Your PDF
Select the PDF with interactive form fields, annotations, or signatures you want to flatten.
Preview Flattening
Review which interactive elements will be permanently burned into the static page content.
Download Flattened PDF
Click Flatten and download your PDF with all interactive elements locked as static content.
Flatten PDF forms and interactive content
Lock down interactive form fields, checkmarks, annotations, and signature layers in your PDF. This tool burns them directly into the page content so they can no longer be edited or changed.
Flattening is performed client-side using JavaScript, securing your completed forms immediately with no server uploads required.
Frequently Asked Questions
How secure is Flatten PDF?
Flatten PDF uses industry-standard algorithms processed entirely within your browser. No passwords, encryption keys, or file data are transmitted over the internet, making it as secure as offline desktop software.
Is it safe to use Flatten PDF with confidential documents?
Absolutely. Flatten PDF processes everything locally inside your web browser using JavaScript and WebAssembly. Your files are never uploaded to any external server. Sensitive documents, contracts, and personal files remain completely private on your device.
Is Flatten PDF really free? Are there hidden limits?
Yes, Flatten PDF is 100% free with no hidden costs. There are no file size limits, no daily usage caps, no watermarks on your output, and no account registration required. Use it as many times as you need.
What gets flattened?
Interactive form fields, checkboxes, radio buttons, text inputs, signature fields, and annotations are all permanently burned into the page as static, non-editable content.