How to use Fill PDF Form Online Free — Complete & Flatten Fillable PDFs
- 1Upload a fillable PDF form.
- 2Type into the text fields, tick boxes and choose options.
- 3Download the filled-in PDF.
About Fill PDF form
Application forms, tax forms and onboarding paperwork usually ship as fillable PDFs. Fill them here on any device — the tool reads the form's own fields, so your answers land exactly where the designer intended.
Frequently asked questions
The form has no fields — what now?
It is a flat PDF. Open it in Edit PDF and type directly onto the page instead.
What does flatten do?
It bakes your answers into the page as normal content, so the form cannot be edited again — good for submissions.
Is the form uploaded?
No — it is filled and saved entirely in your browser.