Fill PDF Forms
Fill in any interactive PDF form and flatten it โ 100% in your browser, nothing uploaded.
Drag & drop your PDF form here, or click to choose. Your file never leaves your browser โ nothing is uploaded.
Form fields
Fill PDF Forms lets you complete interactive PDF form fields right in your browser โ no upload, no account, no limit. Drop in a fillable PDF and the tool automatically detects every form field (text boxes, checkboxes, radio groups, dropdowns and list boxes), prefills the values already saved in the file, and shows a labelled control for each one. Edit the values, optionally tick Flatten to lock the form so it can no longer be changed, then download the filled PDF. Because everything runs locally with pdf-lib, your document never leaves your device โ ideal for tax forms, applications and contracts that contain private data.
Frequently Asked Questions
How do I fill a PDF form for free?
Open this page, drag your fillable PDF onto the box, and the tool reads its form fields and shows an editable control for each. Type or tick your answers, then click Fill & download to save the completed PDF. It is free with no signup and no page limit.
Which form field types does it support?
It auto-detects all standard interactive AcroForm fields: text inputs (including multiline text areas), checkboxes, radio button groups, dropdowns and multi-select option lists. Each is rendered as the matching control and prefilled with any value already stored in the PDF.
Is my PDF uploaded to a server?
No. The entire process runs in your browser using JavaScript โ your file is read locally and never uploaded. That makes it safe for sensitive documents like tax forms, job applications and contracts.
What does the Flatten option do?
Flattening merges your entered values into the page so the form is no longer editable. Use it when you want to send a final, locked copy that recipients can read and print but not change. Leave it unticked to keep the fields editable.
Why does it say my PDF has no form fields?
The PDF is a flat document with no interactive AcroForm fields โ the text you see is printed, not fillable. To add new text on top of a flat PDF, use the Edit PDF tool instead.
Can I fill a password-protected PDF?
Not directly. Encrypted or password-protected PDFs must be unlocked first. Remove the password, then load the file here to fill its form fields.
Will the filled PDF open correctly in other apps?
Yes. The values are written into the PDF with pdf-lib, so the completed form opens the same in Adobe Acrobat, Preview, Chrome and other standard PDF viewers. If you flatten it, the values appear as fixed page content everywhere.