Fill in a PDF form and lock the answers into the page before sending it
Processed in your browser. Nothing is uploaded. Checked against sources on 16 Oct 2026.Offices that ask for a completed PDF often want one nobody can change after it is sent. This page opens with Flatten switched on: fill in the form, and the saved copy has every answer drawn into the page as ordinary content, with the form fields removed. It looks the same in every reader and prints exactly as shown. The original file is left as it was, and nothing is uploaded.
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Government forms, job applications, school and insurance forms are often fillable PDFs: the boxes are real form fields that accept typing. Filling them needs a PDF reader that saves the answers, and not every phone or shared computer has one.
| Field in the PDF | Shown as |
|---|---|
| Text box | a box, or a larger area for multi-line fields |
| Tick box | a tick box |
| Drop-down | a list, or a box with suggestions if the form allows typing |
| List box | a list, with several choices where the form allows it |
| Radio buttons | one choice from the group |
Editable or flattened. The filled copy keeps its form fields unless Flatten is on; then every answer is drawn into the page and the fields are removed. Answers in scripts other than Latin stay editable, because the built-in PDF font cannot draw them.
The rest of the article, and all 6 questions about PDF Form Filler, are on the PDF Form Filler page.
Drop the form on PDF Form Filler. Its fields appear on the page as text boxes, tick boxes, drop-down lists and radio buttons, in page order. Fill them in and press Save filled PDF; the copy downloads with your answers in the real form fields, ready to open in any PDF reader.
Many forms are just printed lines and boxes with no fields behind them. The page says so when a PDF has none and links to Add Text to PDF, which lets you type anywhere on the page instead. A dynamic XFA form, made with Adobe LiveCycle, can only be filled in Adobe Acrobat or Reader.
Flatten draws every answer into the page as ordinary content and removes the form fields, so the answers can no longer be changed and look the same in every viewer and printer. Leave it off to keep the form editable, for example when someone else still has to add their part.
Yes, if the form stays editable. The built-in PDF font only draws Latin-script letters, so for other scripts the file asks the reader to draw the text itself, which Acrobat, Chrome, Edge and Preview do. Flattening such text is refused with an explanation, because it would leave the box blank.
Rates and rules change; check the source before you rely on a figure.
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