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Fill PDF Form – Complete Fillable PDF Forms Online

Open a fillable PDF form and every field appears as a simple box to type into — text boxes, checkboxes, drop-down lists and option buttons. Save the completed PDF, and lock the answers in place if you’re sending it on. No account and no upload.

Your files stay on your device

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How to fill in a PDF form

  1. Choose the PDF form. The tool finds every fillable field and shows how many there are.
  2. Type your answers in the text boxes, tick the checkboxes and choose options from the lists. Fields that are read-only stay locked.
  3. Decide whether to lock the answers (flatten the form).
  4. Press Save filled PDF and download it.

Field types

In the PDFHere
Text fieldText box (multi-line for long answers)
CheckboxCheckbox
Drop-down or list boxDrop-down list
Radio buttonsDrop-down list of the options

Character limits set by the form are respected, so you can’t type more than the form allows.

Flatten or not?

Keep the form editable when:

  • You might need to change answers later.
  • The recipient needs to add their own information.

Flatten when:

  • You’re submitting the final version.
  • You want the answers to look the same everywhere, including on phones and older PDF readers.
  • You’ll add a signature and want nothing to move.

Tips for official forms

  • Download the latest version of a form from the official website — old versions may be rejected.
  • Check required fields, often marked with an asterisk on the printed form.
  • Use the exact format asked for — dates as DD/MM/YYYY or MM/DD/YYYY, names in capitals, and so on.
  • Sign afterwards with sign PDF if a signature is needed.
  • Keep a copy of everything you submit.

Checkboxes and options

Ticked checkboxes are saved with the form’s own tick style, so they look the same as if you had filled the form in another PDF app. For option buttons (radio buttons), choose one answer from the list; the PDF only allows one per group. If a drop-down list shows no options, the form maker left it empty and you can leave it blank.

Saving partly filled forms

You can save a form that is only partly complete, without flattening it, and come back later: open the saved PDF here again and your earlier answers will already be filled in.

When fields don’t appear

Some PDFs use a newer format called XFA (often made with older Adobe tools for government forms). XFA forms can only be filled in specific software, and this tool may not find their fields. If that happens, the issuing organisation’s website usually explains which app to use.

To check the PDF’s properties, use edit PDF metadata; to password-protect the completed form, use protect PDF; and to read the form’s text, try PDF to text.

Frequently asked questions

How do I know if a PDF form is fillable?

Open it here. If it has interactive fields, they’re listed with their names and current values. If the tool says there are no fillable fields, the form is a flat document — often a scan — and has nothing to type into.

What does “Lock the answers (flatten)” do?

It turns your answers into ordinary page content so they can no longer be changed and display the same in every PDF reader. Leave it unticked if you or someone else needs to edit the form later.

Why are some field names strange?

Field names are chosen by whoever made the form and are sometimes technical, like “txtSurname_1”. The tool tidies them up, but compare with the printed labels on the form if you’re unsure.

Can I fill in a scanned form?

Not with this tool, because scans have no fields. You can print it, or ask the sender for a fillable version. Many government and bank forms are available as fillable PDFs on their websites.

Which characters can I type?

Letters used in English and Western European languages, numbers and common punctuation. Other scripts are replaced, because the standard PDF form font can’t show them.

Is my information private?

Yes. The form is filled in your browser and nothing is uploaded — important for tax, medical and immigration forms.

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