Fill PDF Forms

This tool fills the fields already in a PDF and downloads a new copy with your answers saved. It keeps existing values and never changes the original file. Everything runs in your browser, so the PDF is never uploaded.

How to fill a PDF form

1. Drop your PDF onto the tool or click Choose file.
2. Wait while the form fields are read. Each field is shown with its name and type.
3. Type into text boxes, tick check boxes, choose radio buttons, or pick values from dropdowns and option lists. Required fields are marked; read-only fields cannot be changed.
4. If you want a copy that cannot be edited, tick Flatten form fields after filling. Leave it off if you may need to update the answers later.
5. Click Save filled PDF, then download the result, named after your original file such as application-filled.pdf.

The original PDF is never modified. If you make a mistake, open it again and start over.

Field types supported

The tool fills standard AcroForm fields, the interactive fields used by most forms:

• Text fields, including multiline boxes. Character limits are enforced and existing values that are too long are flagged.
• Check boxes, which can be ticked or cleared.
• Radio groups, where you choose one option or clear the selection.
• Dropdowns, including dropdowns that let you type a value not in the list.
• Option lists, including lists that allow more than one selection.
• Read-only fields, displayed with their current value but disabled.

Push buttons and signature fields are skipped with a note. A field type the tool does not recognise is shown read-only and left unchanged when you save.

Field names such as applicant_first_name become readable labels, with the original shown underneath. Duplicate and unnamed fields are handled separately so one cannot overwrite another. Required fields are marked but not enforced, because a form may be saved as a draft.

What flattening does

Flattening draws each field's appearance into the page and removes the interactive fields. The visible result is the same, but the answers become permanent: they can no longer be edited, tabbed through, or read as form data. This suits a final copy that should not be changed, or a form that needs to look consistent in every reader and when printed.

Leave flattening off if you may need to correct an answer, submit the form electronically, or reuse the PDF as a template. Flattening removes the fields from the saved copy, so it cannot be used to collect new answers.

Some complex forms cannot be flattened because their field appearances are not in a format the tool can convert. Save without flattening first, then flatten the PDF in a desktop editor if needed.

If a PDF has no fillable fields

A PDF can look like a form without containing fillable fields. Scanned forms are images, and flattened forms have already lost their fields. This tool cannot invent fields, recognise boxes on a scan, or turn a printed form into a fillable one.

XFA forms are an older format that most browser-based PDF libraries, including this one, cannot read. If the tool reports XFA, open the PDF in Adobe Acrobat or Foxit Reader, fill and flatten it there, then upload the flattened copy.

If you expected a PDF to be fillable, open it in a desktop reader and check whether the fields respond. If they do not, the file is scanned or flattened; adding fields needs a PDF editor.

Quality and what is preserved

The tool does not rebuild or re-render the pages. It adds values to the existing document and updates the appearances of the fields you changed, so text, images, page layout and print settings elsewhere are left alone. Existing values are loaded so you can review or edit them.

Filled text uses the form's field appearances. Simple text and ticks stay sharp at any zoom, but unusual characters, decorative fonts or complex layouts may not match the original design perfectly. The download may be slightly larger because updated appearance data is stored.

Limitations

• Password-protected PDFs cannot be opened. Remove the password in your PDF reader and save an unprotected copy first.
• Digital signatures may be invalidated by any change, including filling a field. If a document is signed, check whether it must stay untouched.
• XFA forms and form JavaScript are not supported. Calculations, validation rules and scripts will not run.
• Numeric formatting is not applied. Numbers are written as text, so currency symbols and decimal places may need typing yourself.
• Some field types are not supported by the PDF library. They are shown read-only and left unchanged.
• Very large forms work best on a computer, since the document is held in browser memory.

Common uses

This tool is handy for job applications, tenancy forms, school enrolment paperwork, consent forms, simple invoices and order forms, and any other PDF that already has fillable fields. It is also useful for keeping a completed copy before sending the original on.

Privacy

Files are opened and saved by your own browser. They are never uploaded to a server, and no account is needed. That makes the tool suitable for confidential forms, provided you trust the device you are using and keep the downloaded file somewhere safe.

Related PDF tools

• To add a signature image to a finished form, use Sign PDF.
• To number the pages of a long application or contract, use Add Page Numbers to PDF.
• To combine a completed form with supporting documents, use Merge PDF.
• To trim the page margins after filling, use Crop PDF.
• To reorder or remove pages before filling, use Organize PDF.

Fill PDF Forms FAQ

Is this tool free to use?

Yes. You can fill and download as many PDFs as you like without signing up, and no watermark is added. The only limit is your browser's memory.

Is my PDF uploaded anywhere?

No. The file is read and written in your browser and never sent to a server, so the tool is safe for private documents. Very large PDFs depend on memory.

Why does my PDF show no fillable fields?

The PDF probably contains a scan, a flattened form, or no form fields at all. This tool cannot create fields or detect boxes in a picture. Check the file in a desktop reader to confirm whether its fields respond.

Can I fill an XFA form?

No. XFA is a separate form format that the PDF library used here cannot read or modify. Open the file in Adobe Acrobat or another XFA-capable reader, fill it there, and save a flattened copy if needed.

Should I flatten the form?

Flatten if you are sending a final copy and want the answers to be permanent. Do not flatten if you may need to edit the answers, submit the form electronically, or reuse the PDF as a template. Flattening cannot be undone.

Will my answers look the same in every PDF reader?

Usually the text and ticks appear as entered, because the tool updates field appearances before saving. Very unusual fonts, right-to-left text or complex layouts may look different. Check the download in the reader your recipient will use.

Does filling a form break a digital signature?

It can. Changing any part of a signed PDF may invalidate its signature, even if the visible change is small. If the document must remain verified, do not edit it; ask for an unsigned copy.

Does this work on a phone or tablet?

Yes, the controls work in mobile browsers and the layout adapts to a narrow screen. Forms with many fields are easier on a larger screen, but the saved PDF is the same.