Is Flatten PDF free to use?

Yes, completely free. No signup, no watermark, no file limit. Flatten as many PDFs as you need.

Is Flatten PDF safe? Do my files get uploaded?

No upload required. All flattening happens in your browser using pdf-lib. Your PDF never leaves your device.

Does Flatten PDF work on mobile, iPhone, and Android?

Yes. The tool works in any modern browser including Safari on iPhone and Chrome on Android.

What does flattening a PDF actually do?

It converts interactive elements — form fields, annotations, and any layered objects — into static page content. After flattening, the values cannot be edited or changed, which is ideal for sharing a final signed or filled form.

Will flattening break the appearance of my PDF?

No. Flattening preserves exactly how each field is currently displayed. The filled-in text, checked boxes, and selected options all appear identical in the flattened version — they just can no longer be edited.

Flatten PDF Online Free

Flatten PDF form fields and annotations to static content. Convert interactive elements to non-editable text and graphics.

What does flattening do?

Flattening a PDF converts all interactive form fields (text inputs, checkboxes, dropdowns, radio buttons) into static, non-editable content. The filled values remain visible but can no longer be changed. This is useful for finalizing documents, preventing further edits, and ensuring consistent display across all PDF viewers.

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Flatten form fields and annotations

Max 100 MB per file

Last updated May 2026

When to use Flatten PDF

Use this tool when you want to finalize a filled PDF form, prevent further editing, or ensure the PDF displays consistently across all devices and PDF viewers. Flattening is also useful before printing or archiving documents.