Stop filling test forms by hand
FillMatic detects every field on a form and fills it with realistic data in milliseconds. Built for developers who test forms every single day.
No account required · Works on any form · Manifest V3
Works great with
Fills the right data, every time
FillMatic understands what each field expects. No random text in email fields, no strings in number inputs.
Smart Field Detection
Reads autocomplete attributes, name, ID, placeholder, and label text to understand what each field expects — then fills it with the right kind of data.
Realistic Fake Data
Generates proper names, emails, phone numbers, addresses, URLs, and more. Looks real enough to pass validation without touching production data.
Natural Typing Simulation
Simulates real keystrokes with configurable speed, firing focus, beforeinput, input, change, and blur events — React, Vue, and Angular controlled inputs respond correctly.
Framework-Safe Filling
Uses native prototype setters to bypass React and Vue value trackers, ensuring onChange always fires and controlled inputs update their visible state.
Built for serious form testing
Profiles, Actions, and Field Rules give you precise control over what gets filled — on a per-site, per-environment basis.
Custom Actions
One-click buttons that appear in the popup on matching URLs. Each Action runs a full autofill and overrides specific fields with fixed values you define.
Stripe
Fill test card 4242 4242 4242 4242
Lemon Squeezy
Use test card on Lemon checkout
Paddle
Sandbox billing with valid test data
Custom site
Any URL pattern you define
Identity Profiles
Switch between Work, Personal, or Staging profiles — each with its own email domain, password, and ignored fields. One click to switch context.
Field Rules
Match any field by id, name, placeholder, label, or autocomplete attribute. Exact, contains, or regex operators. Pin a fixed value that always wins.
From install to filled in 60 seconds
Install in one click
Add FillMatic from the Chrome Web Store. No account, no sign-up — works immediately.
Open any web form
Navigate to a registration page, checkout, or any form you're testing.
Fill with one click
Click the FillMatic icon or press the keyboard shortcut. Every visible field fills in milliseconds.
Everything you get, free
No paid tier, no feature gates. FillMatic is free and always will be.
Fills all major input types — text, email, password, select, checkbox, radio, date
Keyboard shortcut to fill without touching the mouse
Handles dynamic forms that mount fields after page load
Per-profile field rules and email addresses
No account required — works offline
Open to feedback — built by a developer, for developers
Test payment flows without memorising test cards
FillMatic ships with built-in Actions for the three most common payment processors. Click once and the right test card fills in — no copy-pasting from docs.
4242 4242 4242 4242
Test card filled automatically
4242 4242 4242 4242
Test card filled automatically
4111 1111 1111 1111
Test card filled automatically
Share your feedback
Got a feature idea or something not working? Let me know — I read every message.