Stop typing test data.
Dummio reads each field on a form and fills it with believable data in the shape it expects. Click once, or press Alt+Shift+F. Right-click a field to fill just that one.
Free and open source, for testers and web developers.
9 of 9 fields filled
- First name
- Maricel
- Last name
- Dela Cruz
- Email address
- maricel.delacruz42@example.com
- Mobile no.
- +63 917 482 1093
- Birthday
- 18/03/1994
- Address
- Brgy. San Antonio
- City
- Pasig City
- Province or state
- Metro Manila
- ZIP code
- 1605
Sample data, all made up.
Every value in the shape the field wants
Dummio checks date order, phone format, length limits and patterns before it writes. If the form still rejects a value, it tries the next likely format.
| Field | What it asks for | What Dummio writes |
|---|---|---|
| Birthday | type="date" | 1994-03-18 |
| Birthday | Placeholder DD/MM/YYYY | 18/03/1994 |
| Mobile | maxlength="11" | 09174821093 |
| Mobile | +63 beside the field | 9174821093 |
| ZIP | maxlength="4" | 1605 |
One made-up person per fill
The email matches the name, and the street, city, province and ZIP belong together. It ships with about 1,900 Philippine cities and municipalities, and 3,000 US cities.

Your usual test login, on the sites you choose
Pin a value to a site, like a fixed test email on staging, and Dummio uses it there every time. Everything else stays random.

Fill just one field
Don't need the whole form? Right-click a field and choose "Fill this field". Dummio fills that one and leaves the rest alone.
Sample data, all made up.
The extension has no account, no tracking and no server
It makes no network requests, and it only touches a page when you click, press the shortcut or right-click. Read its privacy policy
activeTabFill the page you're on, after you askscriptingRun the filler on that pagecontextMenusAdd "Fill this field" to the right-click menustorageSave your settings and site presets
FAQ
Alt+Shift+F does nothing
Another extension may already use that shortcut, so the browser left it blank. Set your own keys on the browser's extension shortcuts page.
Why can't it fill this page?
Browsers keep extensions off their own pages, like settings, new tabs and the extension store. Try it on a regular website.
A field got the wrong kind of value
Open an issue on GitHub with the page and the field. A public test page and a screenshot make it much quicker to fix.
Could a live form text the number?
Philippine mobile numbers use real prefixes, so one could belong to someone. Emails use reserved example domains and US numbers use the fictional 555-01XX range, so those never reach a real person.
Try it on your next form.
Saving you time? Buy me a coffee.
Dummio is free to use. If it saves you some typing, a coffee on Ko-fi helps me keep fixing and improving it.
Completely optional. Opens Ko-fi in a new tab.