Auto-detects every field
Scans every page and surfaces text boxes, checkboxes, radio groups, dropdowns, and option lists without manual coordinate mapping.
Fill PDF form
PDF Form Filler: Fill Form Fields Online
Open any fillable PDF and type straight into its fields: text boxes, checkboxes, radios, dropdowns. Your file is never uploaded; everything happens in your browser.
- Runs in your browser
- Nothing uploaded
- No sign-up
- Free, no daily limits
- 1Add your file
- 2Choose settings
- 3Download
Loading PDF Form Filler…
Your file is safe
It is processed inside this browser tab and never uploaded, and it is gone when you close the page.
Good to know
- Fill text boxes, checkboxes, radio buttons and dropdowns directly.
- Flatten the form afterwards to lock the answers permanently into the page.
- For a scanned form without digital inputs, Smart Fill automatically detects field lines.
A PDF form filler detects interactive form fields already present in a PDF document and lets you type into them directly inside your browser without printing, scanning, or installing desktop software. The tool identifies text boxes, checkboxes, radio buttons, dropdown menus, and list boxes automatically, writing your entries back into the PDF data structure upon download.
This page is for filling in forms. To design a new form and place its fields by hand, use Make PDF Fillable. Use this tool to type answers into existing inputs, toggle checkboxes, choose dropdown values, and save completed documents.
TryDocsy PDF Form Filler operates 100% client-side using pdf-lib and PDF.js. The original form field structure is kept in the file you download. Keystrokes, field selections, and document saves take place exclusively in your local browser memory.
When a document lacks interactive form fields, the Smart Fill system activates automatically. It scans visible text and underline vectors to detect common labels (Name, Email, Date, Signature) and synthesises inputs over the blanks. Each detected field displays a confidence rating (high, medium, or review) so you can audit the placement.
Common workflows include completing job applications, government filings, tax forms, rental leases, and medical intake records. After completing your entries, you can lock the fields into permanent page content using Flatten PDF.
If your PDF has no fields or needs changes beyond them, read how to edit a PDF with no form fields or convert static blanks into interactive inputs using Make PDF Fillable.
Fill Form vs Flatten PDF vs Edit PDF: Choosing the Right Tool
Working with PDF forms often involves three related tasks. Here is how TryDocsy's specialised tools divide the work:
Fill Form (This Tool)
Interacts directly with the document's internal AcroForm layer. You type into official form fields, click checkboxes, and choose dropdown options. The form remains interactive unless you choose to flatten it.
Best for: Completing official government, tax, and employment forms.
Converts interactive AcroForm fields into static vector page content and deletes the form dictionary. The answers remain visible and selectable, but no recipient can edit or tamper with your entries.
Best for: Locking completed contracts before emailing or filing.
A full-canvas editor that places new arbitrary text boxes, freehand drawings, whiteout blocks, and shapes anywhere on flat pages that lack interactive form fields.
Best for: Annotating flat document scans or marking up architectural plans.
How to Fill a PDF Form
- 1
Upload the fillable PDF: the file is processed locally in your browser memory without server uploads.
- 2
The tool audits every page and surfaces interactive fields: text boxes, checkboxes, radio groups, and dropdowns. If no fields exist, Smart Fill synthesises inputs over detected form lines.
- 3
Click into any input on the page canvas to enter text, check boxes, or choose dropdown items. The sidebar provides a complete field inventory with quick-jump navigation.
- 4
Enable 'Flatten (lock answers)' if you want to bake values into the page content so entries cannot be altered by recipients.
- 5
Click 'Download filled PDF' to save your completed document with all vector field appearances intact.
What This Form Filler Does
Stays editable, or locks answers
By default the form stays interactive so the recipient can adjust. Enable Flatten to bake the answers into the page for a final, locked copy.
Reads every AcroForm field
Backed by pdf-lib, the same engine Adobe Acrobat uses for AcroForm: every standard field kind renders and writes back correctly.
100% private in-browser
Detection, editing, and export all run locally. Your PDF never touches a server, making it safe for medical and financial forms.
Smart Fill for flat PDFs
Synthesises interactive fields on flat documents by detecting underline vectors and field labels like Name, Email, and Signature.
Free and watermark-free
No account registration, no subscription fees, no watermarks, and no document limits beyond local memory boundaries.
Related PDF Tools
Flatten PDFBake form answers into permanent static page contentEdit PDFAdd freeform text, whiteout boxes, and shapesSign PDFAdd a digital or drawn signature to your formPDF OCRRecognise text on flat scans before form fillingRedact PDFPermanently black out confidential visible detailsRemove MetadataPurge author details and revision history
Frequently Asked Questions
Can I create new form fields on a flat document with this tool?
Smart Fill can suggest fields on a flat document here. To place, name and order fields yourself, use Make PDF Fillable. To type freeform text or add notes on a flat page, use Edit PDF.
How do I fill out a PDF form online for free without Adobe Acrobat?
Upload your document into TryDocsy PDF Form Filler, click into the interactive text fields, checkboxes, or dropdowns, enter your information, and click Download filled PDF. The entire workflow executes in your browser without requiring an Adobe Acrobat paid license.
How do I fill a non-interactive PDF form that has no form fields?
If your PDF is flat and lacks AcroForm fields, TryDocsy's Smart Fill engine automatically detects printed labels (such as Name, Date, Address, and Signature) and places editable fields over the blanks. Alternatively, open /pdf/edit to type freeform text anywhere on the page.
What is the difference between filling a form, flattening it, and editing it?
Fill Form populates existing interactive AcroForm fields. Flatten PDF permanently bakes those filled responses into the visual page content so nobody can edit or clear them. Edit PDF is a general canvas editor used to add new text, drawings, and whiteout boxes anywhere on a flat document.
What types of PDF form fields are supported?
TryDocsy supports all standard AcroForm field specifications: single-line text, multiline text areas, checkboxes, radio button sets, dropdown select menus, and list boxes. Values are serialized back into the document catalog using pdf-lib.
Are my filled form answers visible on all PDF readers?
Yes. TryDocsy triggers field appearance updates upon saving, generating standard vector appearance streams. Your answers display in Adobe Reader, Apple Preview, web browsers, and mobile operating systems.
Is my personal data or filled form uploaded to a server?
No. All field detection, keyboard entry, and PDF generation happen locally in your browser tab. Your document and private responses never leave your computer.