Browser extension · Chrome, Edge, Brave
Formdouble: Test Form Filler
Fill any form with realistic test data that passes its own rules: matching names and emails, valid patterns, ranges and undo.
Formdouble fills web forms with believable test data in one click, so you can test sign-up, checkout and contact forms without typing.
The data fits together and fits the form:
- One made-up person per fill: the email matches the name, the city matches the postcode, and both email fields and both password fields match
- Respects the form's own rules: pattern, min and max, step, minlength and maxlength, required checkboxes and radio groups
- Emails use reserved test domains (example.com) and websites end in .example, so nothing reaches a real inbox
- Card numbers are the standard public test cards, IBANs pass the bank check digit test
- Works with React, Vue and other frameworks: their state updates as if you typed
- Fills fields inside web components (shadow DOM) and inside frames
Free, with no limits on use:
- Fill the whole page, one form, or one field (toolbar, right-click menu or shortcuts)
- Undo the last 10 fills
- Only fill empty fields, so your own entries stay
- Seed: get the same data every time for repeatable tests
- Skip list: never touch fields that match your selectors
- Highlight what was filled
- US data style
Pro (EUR 9, one payment, no subscription):
- Five more data styles: Dutch, Belgian, German, French and British names, addresses, postcodes and phone numbers
- Field rules per site: fixed values, lists to pick from, or templates that combine the first name, last name and random digits on a reserved test domain
- Auto-fill on sites you choose, every time the page loads
- Export and import your settings
Privacy: Formdouble has no access to your sites at install. It runs on a page only when you click it, use its menu or a shortcut. Auto-fill asks for access to each site you add. All data is generated in your browser. Nothing is collected or sent anywhere. No analytics, no ads, no upgrade banners.
Works in Chrome, Brave, Edge and other Chromium browsers.
Install and price
Formdouble is free. The Chrome Web Store listing is in review; the install link will be added here when it is live. Pro costs €9, one payment, no subscription: Buy Pro on Gumroad