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Flatten PDF

Free online PDF flattening tool. Convert interactive form fields into static content. Make filled forms uneditable, reduce file size, and ensure consistent appearance. All processing happens locally in your browser.

100% Private (In-Browser)Instant Web Worker SpeedZero Server Upload
Flatten PDF by Privacy-First Toolbox is a 100% free, client-side browser utility. It processes your files locally on your computer or smartphone using HTML5 and Web Workers—zero bytes of your files or data are ever uploaded to any external server.

Key Features

  • Convert forms to static
  • Lock field values
  • Reduce file size
  • Consistent appearance
  • Preserve content
  • 100% private & secure

Common Use Cases

  • Submit filled forms
  • Archive completed documents
  • Prevent editing
  • Prepare for printing

How to Use Flatten PDF

Three simple steps to process your files securely in browser.

1

Select Your File

Drag and drop or browse your local file into the secure tool workspace.

2

Configure Options

Set quality, output format, or formatting options for your task.

3

Instant Download

Save your processed output immediately with zero server upload.

Frequently Asked Questions

🔒100% Client-Side: Your files never leave your device.