Fill PDF Form Online Free
Detect and fill interactive PDF form fields directly in your browser.
Drop files here or click to upload
Max 100 MB
Detect interactive form fields in a PDF and fill them in your browser. Supports text fields, checkboxes, radio buttons, and dropdowns. Optionally flatten the form to lock in your answers as static content.
Last reviewed: June 2026
How to use this tool
- 1Upload a PDF that contains interactive form fields.
- 2Review the detected fields listed with their names and types.
- 3Fill in each field using the provided input controls.
- 4Click Process to save the filled PDF, with optional flattening.
Common use cases
- Fill tax forms or government applications without Adobe Acrobat.
- Complete job application PDFs before submitting.
- Fill survey or questionnaire forms for offline distribution.
Technical notes
- Detects AcroForm fields: text, checkbox, radio group, dropdown, and option list.
- Flattening converts form fields into static page content that cannot be edited further.
- Read-only fields are displayed but cannot be modified.
Private by design
This tool runs in your browser. Your file is not uploaded to our server while using the tool.
Limitations
- Does not support XFA forms (Adobe LiveCycle Designer forms).
- JavaScript-based form logic (auto-calculations, validation) is not executed.
- PDFs without embedded form fields will show no fillable fields.
Frequently Asked Questions
Why does the tool say 'no form fields detected'?
The PDF may not contain interactive AcroForm fields. Some PDFs that look like forms are just static text and lines — they need a PDF editor to add real form fields.
What is form flattening?
Flattening converts interactive fields into static page content. The filled values become permanent and the form can no longer be edited.
Does this work with Adobe LiveCycle (XFA) forms?
No. XFA forms use a different technology. This tool supports standard AcroForm fields only.
Can I save a partially filled form and continue later?
Yes. Download the filled PDF without flattening, then re-upload it later to continue editing the remaining fields.
Are my form entries sent to any server?
No. All form detection and filling happens in your browser. Your data stays on your device.