Fake Filler Alternative: FormFiller vs Fake Filler Compared

Fake Filler is the best-known browser extension for filling forms with fake data, and if you test web forms for a living there's a good chance you've used it. FormFiller does the same job in a different way. This page compares the two honestly, including where Fake Filler is the better choice.

Full disclosure: we make FormFiller. Everything said about Fake Filler below comes from its Chrome Web Store listing, its website and its open-source code, as of October 2026.

At a glance

How Fake Filler works

Install it from the Chrome Web Store, Edge Add-ons or Firefox Add-ons, open any page with a form, and press Ctrl+Shift+F (Cmd+Shift+F on a Mac). Every text box, dropdown, checkbox and radio button on the page is filled with dummy data. It ignores CAPTCHAs and hidden, disabled and read-only fields. There are also commands to fill only the current form or the current input, and you can change the shortcuts in the browser's extension settings.

Its strongest feature is custom fields: in the options page you tell it what to put in fields that match a name, using a data type such as a regular expression, a list of values to pick from, a number or date range, or a phone format. Profiles let you set different rules for different websites. The free Lite plan allows 25 custom fields; Fake Filler Pro removes the limit for $3.99 a month or $40 a year.

How FormFiller works

FormFiller reads each field's name, label and placeholder to work out what it expects, then fills it with realistic data from Faker.js: names, emails, phone numbers, addresses, cities, states and ZIP codes, company names, job titles, websites, passwords, ages and dates. Dropdowns, radio buttons and checkboxes are filled too, and hidden and disabled fields are skipped.

You can fill a whole form at once or a single field, from the right-click menu or with keyboard shortcuts you set yourself. If a field gets the wrong kind of data, you pick the right data type for it from a menu in the popup, and FormFiller remembers that choice for that form the next time you open it.

There's no account and no paid plan. Everything is generated locally in your browser.

When Fake Filler is the better choice

You need precise values in specific fields. If a form only accepts a certain pattern, such as an internal customer ID or a value from a fixed list, Fake Filler's regex and list rules handle it. FormFiller can't be told to generate a custom pattern.

You want the same rules on several computers. Fake Filler can sync its settings through an account.

You want a tool with a long track record. Fake Filler has around 400,000 users and is open source.

When FormFiller is the better choice

You want realistic data without writing rules. Detection from labels and placeholders means most forms fill sensibly on the first try, and fixing a field is a menu choice, not a rule to write.

You fill single fields a lot. Right-click a field and fill just that one, which is handy when you're testing one input's validation over and over.

You don't want an account or a field limit to think about. FormFiller is entirely free, and its last update is recent. Fake Filler's Chrome Web Store listing was last updated in August 2024.

When you need data for a specific country

Neither extension is built for country-specific test data, such as an address in Turkey with a real postal code, a valid German IBAN or a Luhn-valid Amex number. For that, our free web tools work alongside either extension: the fake address generator and fake identity generator for 22 countries, the IBAN generator, and the test credit card generator.

Try it

Both extensions are free to install, so the quickest way to choose is to try them on the forms you actually test. FormFiller is available for Chrome, Edge and Firefox. For more on what to look for in a test-data extension, see Fake Data Chrome Extension for Form Testing.