Flatten a PDF so completed form fields, signatures, and annotations become static content that can no longer be edited or changed. Flattening runs entirely in your browser, so no document contents are sent to PaperFit.
Yes. Unlike most "flatten PDF online" tools, PaperFit processes your file on your device, and no document contents are sent to PaperFit. Flattening happens on your own device using your browser, which matters because the forms you flatten are often filled with personal details — a signed contract, a tax or benefits form, a medical intake sheet. Those stay with you the whole time. You can confirm it: open your browser network tab and watch — no document contents are sent to PaperFit while you flatten.
No. Flattening runs in your browser. No document contents are sent to PaperFit.
It bakes interactive content — form fields, checkboxes, signatures, and annotations — into the page as static content, so the values stay visible but can no longer be edited.
Standard flattening keeps the text and fields as fixed page content. The optional re-render turns each page into an image, which fully locks everything but makes the text non-selectable.
Standard flattening makes fields static so they can't be filled in again, though the underlying text may still be selectable. Use the re-render to images option if you need the strongest lock.
It's free with no account, and you can flatten PDFs up to 200 MB. If your file is password-protected, unlock it first with the Protect tool before flattening.
Yes. It runs in any modern mobile browser, though very large files flatten faster on a desktop or laptop.