Fill in the fields of a fillable PDF form and save it, editable or flattened
Processed in your browser. Nothing is uploaded. Checked against sources on 16 Oct 2026.PDF Form Filler reads the fields of a fillable PDF form in your browser, lets you type, tick and choose answers, and saves a filled copy, editable or flattened. Text boxes, tick boxes, drop-downs, lists and radio buttons all work, PDFs up to 100 MB, and nothing is uploaded.
Press Select PDF or drop the form on the page; its fields are read on your device, and a locked file asks for its password.
Type in the boxes, tick the tick boxes and pick from the lists; a value that does not fit is marked at once.
Leave Flatten off to keep the form editable, or switch it on so the answers can no longer be changed.
Press Save filled PDF, and the filled copy downloads.
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.
What the page reads. Every field in the form, in page order, shown as the control it is:
| 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 |
Labels come from the field names. Required fields carry a star, read-only fields and signature boxes are left alone, and a box with a character limit shows its count, such as 6 / 8.
Checked as you type. A value longer than the field allows, a line break in a one-line box, or a choice the list does not offer is marked straight away, and the save button says to fix it first.
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.
Tested. Filling was tested on synthetic forms with every field type and checked with pdf.js, a separate PDF reader. Nothing is uploaded.
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.
Some fields set a maximum number of characters, such as eight for a postcode or ten for a phone number. The page shows the count under the box and marks a value that is too long, because a PDF field cannot hold more than its limit and the reader would cut it off.
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.
No. The PDF is read, filled and saved by your own browser, so tax forms, applications and other personal details never reach a server. A password-protected form asks for its password first; the filled copy is saved without the password. Closing the tab clears everything.
Rates and rules change; check the source before you rely on a figure.
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