Fillr is a Chrome extension that saves web forms as presets and fills them with test data or CSV rows. Free plan; Pro from $6.99/month.
Researched and fact-checked by Bartu Cavusoglu · Updated October 26, 2026
Fillr is a Chrome extension that saves any web form as a preset and refills it in one click. It is built for QA testers and developers who fill the same signup, checkout and onboarding forms again and again. Instead of typing fake data by hand, users choose what goes into each field: realistic generated data, a fixed value, or nothing at all.
The data can be generated in the browser or taken from rows in the user's own CSV or Excel file. Fillr also includes test options that push forms with edge cases, malformed input and tricky characters. The homepage lists version 1.6.0, dated July 2026, and says the extension is featured on the Chrome Web Store.
Setup has three steps. First, the user clicks capture on a form and Fillr reads its fields directly from the page. Second, each field is configured: generate realistic data, set a fixed value, or skip it. Third, on later visits Fillr recognizes the form and fills it in one click. A preview option lets users check a fill before it touches a real form.
Fillr appears in three places: a side panel listing presets for the current page, a floating bar on the page for fill, capture and clear actions, and a dashboard for field rules and test rows. One preset covers localhost, staging and production, and Fillr fires real input events so React, Vue and Angular fields register the values.
Presets support 112 data types per field, fixed values, or skipping a field. Generated data covers names, emails, cards and addresses, and the homepage describes it as believable in 60+ languages. Datasets let users import a file, generate realistic rows or start blank, then fill from them or export as CSV, JSON or Excel. A pasted real row can be used to synthesize safe copies.
Six testing options go beyond the happy path: boundary values, malformed input, valid structured data such as Luhn-passing card numbers, tricky characters like emoji and right-to-left text, adversarial injection strings, and persona fill. Persona keeps one made-up person consistent across a multi-step signup. The site states all six are Pro features, and adversarial payloads stay off until the user enables them.
Fillr is a Chrome extension that saves any web form as a preset and refills it in one click. It can use realistic generated data or rows from the user's own CSV or Excel file. It is built for QA testers and developers.
Fillr has a Free plan at $0 with no time limit. Pro costs $6.99 per month, or $5.75 per month when billed yearly, which the site describes as 2 months free.
Yes. The 7-day Pro trial takes no credit card and is started from a Fillr account. When the week ends, the account goes back to Free, and there is nothing to cancel.
Free lets users save any form and refill it in one click, with unlimited presets and all realistic data types such as names, emails, cards and addresses. It is limited to English and 3 × 50 own test rows.
Yes, on Pro. Fillr offers boundary values, malformed input, valid structured data, tricky characters, adversarial payloads and persona fill. Adversarial payloads are off by default and must be switched on by the user.
Yes. The homepage says Fillr fires real input events so React, Vue and Angular fields register the filled values.
Yes, on Pro. Users bring in rows from a CSV or Excel file and link them to a saved form. Each fill takes the next row.
Fillr is best for QA testers and developers who fill the same forms repeatedly. It works on internal tools, admin panels, staging and production, using one preset across environments.