Overview: Convert interactive fillable PDF forms into read-only documents. Flatten form fields to prevent editing and secure your data. 100% Client-Side.

FORM LOCKING ENGINE

Flatten PDF Forms

Turn interactive form fields (text boxes, checkboxes, dropdowns) into static content.
Prevent further editing and ensure data integrity.

Select Fillable PDF

Files processed locally. No upload.

This merges all AcroForm fields into the page layer. The document becomes Read-Only.
Note: This tool flattens interactive form fields only. Non-form annotations (sticky notes, comments) are not affected and require desktop software to flatten.
Success! Form fields locked permanently.
Download Flattened PDF

Integrity

Prevent Editing

Print Ready

Fix Layouts

Secure

100% Local

Why Flatten Forms?

Learn the engineering difference between Interactive vs Flat PDFs.

Read Architecture

Frequently Asked Questions

What does flattening a PDF do?

Flattening converts interactive form fields (text boxes, checkboxes, radio buttons, dropdowns) and annotations into static page content so recipients can no longer edit or alter the filled values.

Is my PDF uploaded to a server when I flatten it?

No. PDFTeq's Flatten PDF tool runs 100% locally in your browser using pdf-lib. Your sensitive forms, tax documents, or contracts never leave your device.

Can a flattened PDF form be unflattened later?

No. Once form fields are merged into the static page layer, they cannot be converted back into interactive fields — always keep a backup copy of your editable form.

Can I flatten a password-protected PDF?

If the PDF requires a password to open, unlock it in your PDF reader first before flattening.