What does Flatten PDF do?

It converts interactive form fields (text inputs, checkboxes, dropdowns, signatures) into static page content. The filled values remain visible but are no longer editable.

Is my PDF uploaded to a server?

No. Flattening runs in your browser. Your file never leaves your device.

Will the form values still be visible after flattening?

Yes. Everything that was filled in stays on the page exactly as it appeared. It just can’t be changed anymore.

Does it tell me how many fields will be flattened?

Yes. The tool analyzes your PDF and displays the form field count before you flatten.

What if my PDF has no form fields?

The tool will report zero fields. You can still flatten the document — it won’t change anything, but the output is still a valid PDF.

Does it work with password-protected PDFs?

Yes. Enter the password when prompted. Decryption happens in your browser.

Can I flatten multiple PDFs at once?

Yes. Batch mode processes all files with the same settings.

PDF のフラット化

入力可能なフォームフィールドや注釈を通常の固定コンテンツに変換します。

1. Select PDF

Select a PDF with form fields or annotations.

2. Flatten content

Form fields and annotations are merged into static page content.

3. Download

Get your flattened PDF. Fields are no longer editable but display correctly everywhere.

About Flatten PDF

What Flattening Does

Flattening a PDF converts interactive form fields and annotations into static page content. Text fields, checkboxes, dropdowns, radio buttons, and signature fields all become part of the page image. The values stay visible, but nobody can change them.

OxygenPDF detects how many form fields your PDF contains, shows you the count, and flattens everything in one click. The result is a standard PDF that looks the same as the original but with no editable fields. All processing happens in your browser.

When You Need to Flatten a PDF

Interactive fields are great during data entry. Once a form is complete, flattening locks it down.

Lock Completed Forms

After a form is filled out and signed, flatten it so recipients can’t alter the entries. The content becomes permanent.

Fix Printing Issues

Some printers and print services misrender form fields. Flattening eliminates the interactive layer, so what you see on screen is what prints.

Cross-Viewer Compatibility

Form fields render differently in different PDF viewers. Flattening bakes the content into the page so it looks identical everywhere.

Reduce File Complexity

Interactive elements add overhead to a PDF. Flattening strips that layer, sometimes reducing file size and always simplifying the document structure.

How It Compares

Flattening is a common PDF operation, but not every tool makes it accessible without a paid plan.

機能	Adobe Acrobat	Sejda
Flatten form fields
Shows field count before flattening
Batch processing	Desktop only
No file upload required	Desktop only
Free to use		Limited

Your Forms Stay on Your Device

Filled forms contain personal data, signatures, financial details, and medical information. Uploading them to flatten is an unnecessary risk.

OxygenPDF flattens your PDF entirely in the browser. The file stays local. The flattened output downloads to your machine. Nothing gets transmitted.