PDF Form & Annotation Flattener

PDF Flattener — Flatten Forms & Annotations

Lock fillable form fields, checkboxes, digital signatures, and comments into permanent, read-only PDF content. Prevents tampering and ensures identical printing across all PDF viewers.

🔒 100% In-Browser Processing: Your files never leave your device — everything runs locally in your browser using open-source libraries. Nothing is uploaded to our server. All form fields and signature elements are flattened locally in your browser.

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Select or Drag & Drop a PDF to Flatten

AcroForms, XFA forms, signatures, and annotated PDFs

Flattening Mode

Smart Form Flattening (Recommended): Preserves original vector text and sharp graphics while baking all filled values permanently into the page. Complete Visual Lock: High-resolution rasterization of all pages. Completely removes all form dictionaries, invisible text streams, and scripts.

Flattening document...

Why Flatten a PDF Form?

When you fill out interactive PDF forms in web browsers or preview applications, your inputs often remain stored in dynamic AcroForm fields. Different PDF readers (e.g., mobile phones, older Adobe Acrobat versions, or print kiosks) may render these fields blank, corrupt special characters, or allow unauthorized parties to edit your signed data. Flattening merges the form data directly into the background layer, making the document tamper-proof and universally printable.

Lock Interactive PDF Form Fields and Signatures

Ensure your completed PDF forms and signatures display and print identically on all devices. Merges interactive AcroForm widgets into static vector graphics, preventing unauthorized alterations.