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Fill PDF Forms Online

Fill PDF Forms finds every fillable field in a PDF form and lets you type straight into it on the page: text boxes, check boxes, radio buttons, drop-down menus and list boxes. A field list shows the same fields in reading order, marks the required ones and counts what is filled. For forms that are only printed lines, click anywhere to add text, today's date, a tick or a cross. You can save your answers as a JSON file and load them into the same form later, and flatten the result so nobody can change it. Everything happens in your browser, so personal details on the form stay on your device.

Always freeNo sign upRuns in your browser

How to use

01

Open the form

Drop in the PDF. The tool reads its form fields and shows each one as a box over the page, with a count of fields found in the side panel.

02

Fill it in

Click a field and type, or tick and choose options. Tab moves to the next field. Use Show field list for a plain list, or Add text, Date, Tick and Cross for forms without fillable fields.

03

Download the filled PDF

Tick Flatten if the answers should be locked, then press Download filled PDF. You get a copy with a -filled suffix and a note about any required fields left empty.

Why Fill PDF Forms Online

Fillable fields and flat forms

A fillable PDF has form fields built in, so each answer box knows its type, options and limits. A flat form is just a printed page saved as PDF, often a scan. This tool handles both: fields are filled directly, and flat forms get text, dates and marks placed where you click.

FieldHow you fill it here
Text fieldType on the page or in the list; character limits are kept
Check boxClick to tick or clear
Radio buttonsClick one choice; click it again to clear
Drop-downPick an option, or type your own if the field allows it
List boxPick one or, where allowed, several options
SignatureShown as a box; sign with Draw or the Sign PDF tool

Before you send a filled form

A quick check saves a form being sent back.

  • Read the message after download for required fields still empty.
  • Flatten when the form is final, so answers cannot be changed by mistake.
  • Keep the JSON data file if you fill the same form every month or year.

Common questions

How do I know if my PDF form has fillable fields?
Open it here and look at the side panel. It says how many fillable fields were found and outlines each one on the page. If it finds none, the form is flat, and you can still fill it with Add text, Date, Tick and Cross.
Can I fill a PDF form that is not fillable?
Yes. Choose Add text and click on the line where the answer goes, then type. Date adds today's date in the format you pick, and Tick or Cross marks a box. Each item can be moved, resized and restyled before you download.
What does flattening a filled PDF form do?
It turns your answers into ordinary page content and removes the interactive fields, so the values can no longer be edited and look the same in every reader. Leave it off if someone else still needs to change or add answers.
Can I save my answers and reuse them on the same PDF form later?
Yes. Save data (JSON) downloads a small file with every field name and value. Next time, open the same form, press Load data and pick that file, and the matching fields fill in at once. Fields that are not in the file keep their current value.
Which PDF form field types can this filler handle?
Single and multi-line text fields, including ones with a character limit, check boxes, radio button groups, drop-down menus, editable combo boxes and single or multi-select list boxes. Signature fields are shown but not filled; draw your signature with the Draw tool or use Sign PDF.
Why does a filled field look different in my PDF reader?
Changed fields are redrawn in Helvetica, which is the usual default. If you type characters Helvetica cannot draw, such as Devanagari or Chinese, the field is left for your reader to draw instead, and the form is not flattened so the answer is not lost.
What happens to Adobe XFA forms in this form filler?
Many XFA forms also carry standard fields. The tool fills those and removes the XFA layer, so readers show the standard fields with your answers. Pure XFA forms with no standard fields show no fields here; fill them in Adobe Acrobat Reader.
Are the details I type into a PDF form sent anywhere?
No. The form is read and written with pdf-lib and shown with pdf.js inside your browser tab. Names, addresses, ID numbers and anything else you type stay on your device.
Does the form filler tell me about required fields I missed?
Yes. Required fields are marked with an asterisk in the field list, the panel counts how many are still empty, and the message after download names the ones left blank so you can go back and fill them.

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