Why a filled form sometimes arrives empty
You fill a PDF form, email it, and the recipient opens it to find blank fields — or your highlighted comments simply vanish. The cause is that form fields and annotations live in a separate, interactive layer above the page. Different viewers treat that layer differently: some don’t print it, some hide it, some let it be cleared with a stroke. Until you flatten, your entries aren’t really in the document — they’re floating on top of it.
Flattening fixes this by fusing those layers into the page content. After flattening, what you see is what every recipient sees, on every device, in print and on screen, with no chance of the data being lost or altered.
What flattening locks down
- Form fields — typed answers, checkboxes, and dropdowns become permanent page text.
- Annotations and comments — highlights, notes, and stamps are baked in so they always display and print.
- Signatures and overlays — placed signatures and text stamps can no longer be moved or removed.
The trade-off is finality: a flattened form can’t be re-filled, so flatten only when the document is done. Because flattening runs in your browser, a completed application or signed agreement is locked locally and never uploaded — the finished, sensitive version stays on your device.