Why the answers I typed into a PDF form disappeared

The answers were never saved

The PDF viewer built into a web browser lets you type into a form, and what you type stays on screen until you close the tab. It is not in the file on your disk until you save or download a copy. Attach the original to an email and you have attached the blank form.

The same happens on a phone, where a PDF is often opened read-only from an email or a messaging app. You can type, but the typing belongs to the viewer, not to the document.

The test is simple. Close everything, find the file you are about to send, and open it again. If the boxes are empty for you, they are empty for everyone.

The answers are there, but some viewers do not show them

A form field in a PDF holds two things: the value you typed, and a small drawing of that value which viewers place on the page. Most viewers show the drawing. Some programs save the value, skip the drawing, and leave a note asking the next viewer to draw it. Viewers that act on the note show your answers; viewers that do not show empty boxes.

The giveaway is an answer that reappears when you click into the field, or that shows in one program and not in another. Nothing is lost: the value is in the file, and saving it again with a tool that draws the appearance fixes it for everyone.

A related problem affects text in other alphabets. A field drawn with a font that has no Arabic or Chinese letters shows boxes or nothing, even though the value is correct. Fill PDF Form draws the appearance itself, including for text the form's own font cannot show.

The form only works properly in Adobe software

There are two kinds of fillable PDF. Almost all are the standard kind, which any good viewer can fill. A minority, still found among some government and tax forms, are built with an older Adobe technology called XFA, which the current PDF standard has deprecated. Other viewers support it partly or not at all.

Opened elsewhere, an XFA form may show a page saying the document cannot be displayed, a form with no fields, or fields that accept typing and lose it on save. Filling it in Adobe Acrobat Reader, which is free, is the reliable route. If the form comes from an authority, check whether it also publishes a standard version or an online form.

If the form will not let you type at all, that is a different problem: see how to fill in a PDF form that will not let you type.

Check before you send it

• Reopen the saved file, not the window you typed into.
• Open it in a second viewer: a browser if you filled it in a desktop program, or the other way round. If both show your answers, the person you send it to will very likely see them too.
• Look at long answers in short boxes. They are cut off on the page even when the stored value is complete.
• Check signature and date fields last, since they are the ones most often filled in a different program from the rest.

Send a form that looks the same everywhere

If nobody needs to change your answers after you, flatten the form before sending it. Flatten PDF turns every field into ordinary page content: the answers stop being editable and stop depending on the viewer to draw them. A flattened form shows the same answers in every program, prints the same way, and cannot be changed by accident on the way.

Keep an unflattened copy for yourself in case you need to correct something, because flattening cannot be undone. And if the recipient's system reads the answers automatically, ask first: some systems expect live fields and reject a flattened file. What flattening a PDF means goes into the details.