Dropdown / List Box Field - Free Online Browser Tool

Add a choice field to a PDF so the reader picks from a list you set, not free text.

A text box on a form invites every spelling of every answer. "engineering", "Engineering", "ENG", "eng." - four different strings in what should be one column of data, and nobody downstream can use any of it without a person reading every row and fixing it by hand. A choice field removes that decision from the person filling the form in, which is the only place it can be removed from. This adds one to a PDF you already have. You name the field, say where on the page it goes and how big it is, and type the options one per line. The two shapes it can create behave differently on the page and are worth choosing deliberately. A dropdown is a single line that opens when clicked - tidy, and the right choice when there are more than about eight options. A list box shows several options at once and can take more than one selection, which is what you want for "select all that apply" or a long list you do not want hidden behind a click. Both are the same field to whatever fills the form afterwards. Duplicates in your list are dropped rather than written twice. It looks like a mistake to whoever opens the form, and picking the second "Design" is indistinguishable from picking the first. A field name that already exists is refused too, because two fields with one name means a value saved into one of them is ambiguous - which is exactly the problem this tool exists to avoid. Fewer than two options is also refused: a choice field with one choice is a label with extra steps. Your existing fields are untouched. This adds to a form rather than rebuilding it, so anything already filled in stays filled in. If you want to go the other way and build a field from scratch, Add TextField / Checkbox covers text and tick boxes, and Add Radio Button Choice Group covers a small fixed set where the options should all be visible at once. Everything happens in this tab.

This dropdown / list box field utility runs completely inside your web browser. Your document is opened locally and processed on your own device using JavaScript and WebAssembly, so your file is never uploaded to any server. There is no signup, no watermark and no limit on how many documents you can handle.

  • 100% client-side - files never leave your device
  • Instant processing, no upload wait
  • Works on desktop, tablet and mobile
  • Free forever, no account required

How to Use the Dropdown / List Box Field Tool

Five steps, and the whole thing runs locally on your own device.

  1. Add the PDF

    The form as it exists now. Existing fields are kept exactly as they are, including anything already filled in.

  2. Name the field and place it

    The name is how a later fill knows where the value goes, so pick the one your data will use. Position is in points from the bottom-left corner of the page.

  3. Type the options, one per line

    Duplicates are removed automatically, keeping the first spelling. Two or more are needed - one option is not a choice.

  4. Choose dropdown or list box

    A dropdown is one line that opens on click; a list box shows several options and can take more than one selection.

  5. Save

    One PDF with the new field on it, and a summary of what was added, how many options, and how many fields were already there.

Frequently Asked Questions

What is the difference between a dropdown and a list box?

A dropdown is a single line that opens when clicked, which keeps the page tidy when there are many options. A list box shows several options at once and can accept more than one selection, which suits a long list or a tick-all-that-apply question. Both store their value the same way, so filling them later works identically.

Why does it refuse a name that is already there?

Because two fields sharing a name makes a saved value ambiguous - a fill operation would have no way to know which of the two boxes it was meant to land in. Refusing at creation is better than discovering it when someone has already filled the form and the data does not add up.

Will it damage the fields already in my form?

No. The field is added to the document rather than the form being rebuilt, so existing fields and any values already in them are left alone. The summary lists how many fields were already present so you can confirm nothing was lost.

How do I decide where to put it?

Position is given in points from the bottom-left corner of the page, and points are what a PDF uses throughout - 72 of them to the inch. Most page tools show coordinates in the same unit, so a position copied from a layout tool will land where you expect.

What if I want tick boxes or radio buttons instead?

Add TextField / Checkbox creates a free-text field or a tick box, and <a href="https://www.allpdf.tech/pdf-forms/add-radio-group" class="seo-link">Add Radio Button Choice Group</a> creates a set of mutually exclusive options that are all visible at once. A dropdown is the better choice when the list is long enough that showing every option would cover the page.