Is Flatten PDF completely free?

Yes, completely free with unlimited usage. No registration, no hidden fees, no file size limits.

What does flattening a PDF do?

Flattening merges all form fields, annotations, and layers into the PDF content. Once flattened, fields become uneditable but are permanently visible on every page.

Will flattening a PDF remove my annotations?

No. Flattening converts annotations and form fields into permanent parts of the document, making them visible on all devices but no longer editable.

How large can my PDF file be?

Files up to 50 MB are supported. Most documents flatten in under 30 seconds regardless of page count.

Is my PDF secure when I flatten it?

Yes. All processing happens entirely in your browser. Your PDF never uploads to our servers—it's processed locally on your device then deleted immediately.

Does Flatten PDF work on mobile devices?

Yes, works on iPhone, Android, iPad, tablets, and desktop browsers. Full functionality across all devices.

Can I flatten PDFs with password protection?

Password-protected PDFs must be unlocked first before flattening. Use a PDF unlocker tool, then flatten the unprotected version.

What file formats does this tool accept?

Only PDF files (.pdf extension) are accepted. The output is always a flattened PDF file.

free

Flatten PDF — free

Flatten PDF forms and annotations online for free.

Flattening merges form fields, annotations, and layers into the page content — making the PDF non-editable and smaller.

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Click or drag a PDF file here

PDF files only

How to use Flatten PDF

Upload Your PDF File

Click the 'Choose File' button in the center of the page or drag and drop your PDF directly into the upload area. The file will begin processing immediately.

Wait for Processing to Complete

Your PDF will be processed in your browser. A progress indicator shows the flattening status. This typically takes 5-30 seconds depending on file size.

Download Your Flattened PDF

Once complete, click the blue 'Download' button to save your flattened PDF. All form fields and annotations are now permanently merged into the document.

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