Runs locally · Zero uploads

PDF Flatten

Lock filled-form values into the page content. One click.

How it works

Lock down an already-filled AcroForm PDF so the values become permanent annotations and the document is no longer editable. Common workflow: someone filled a form, and you need to send the final version to a counterparty who should not be able to change anything.

Verify it yourself. Open DevTools → Network → run a conversion. The only requests you'll see are the page assets — your file never leaves this tab.

FAQ

Can flattening be reversed?

No — flattening is one-way. The form definition is removed and the filled values become part of the page content stream. Keep an unflattened backup if you need editability later.

Will the file size change?

Slightly smaller, usually. The form definition (which can be a few KB) is removed.

Do digital signatures survive flattening?

Visual signature appearances do; the cryptographic signature itself does not survive a flatten because flattening modifies the document. Sign after flattening, not before.