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FormCarbon
Language: English

Tedious forms, filled in one click.

FormCarbon fills the form you have open with a profile you've saved. Press the toolbar button or the keyboard shortcut, and the preview shows what goes into each field. Check it and press Fill. It never submits the form, and Undo puts the fields back as they were.

Add to Chrome See Pro

Unlimited fills, on the free plan too.

Checked against 53 sample forms in 9 languages. Every one is public, so you can try the same forms yourself. Try it on sample forms

The FormCarbon panel. The heading reads “Fills 21 fields — 4 need your choice” and “Fill with” is set to Personal. A first row, “Have a coupon? Enter your code”, is orange and says Choose…; the rows below show First name Avery, Last name Quintero, Company name Fernhollow Test Supply, Country / Region United States (US), Street address 100 Example Street NW and Suite 200. At the bottom, an orange “Fill 21 fields” button and the note “Nothing is written to the page until you press Fill.”

How FormCarbon works

Press to fill. It never submits.

Open it with the toolbar button or the shortcut, and press Enter to fill. Focus then moves to the submit button, so you can check the form and send it yourself. FormCarbon never presses it.

See it first, undo it later

Nothing is written to the page until you press Fill. You can change any row or leave it empty. After filling, Undo puts the fields back (fields you have edited since are left alone), and Fill again puts the values back in.

Your data stays in your browser

Profiles and settings are stored only on this device, never in Chrome sync. No account, no analytics, no ads. The only network requests are for the Pro license, and without a key FormCarbon makes none.

How it works

  1. Save your details

    On the settings page, save your name, email, phone and mobile numbers, address, work details and more as a profile. Or fill a form by hand and turn it into a profile. Keep separate profiles, such as one for home and one for work.

    The settings page, Profiles. On the left, the profile Personal and a New profile button, with “1 of 2 on the Free plan” and a yellow Pro mark. On the right, the Name section lists First name Avery, Last name Quintero, Middle name Rowan, Title Dr., Name suffix III, Nickname Ave and Full name Avery Rowan Quintero.

  2. Press the button on a form and check

    On a page with a form, press the button or the shortcut and the preview lists the value for each field. Blue rows are filled by FormCarbon; orange rows are yours to choose. Press a row to open its menu and pick a field from your profile, one of the field’s own options, a saved text (its first line is shown), your own words, or Don’t fill.

    The panel on a contact form: “Fills 3 fields — 1 needs your choice”, filled with Test EN. Rows for Name (Avery Rowan Quintero), Email, Subject (Choose…) and Message. The Message row’s menu is open: From your profile lists Address line 1, Full address, Job description, Message (selected), Member number and Ticket number with their values; Saved texts lists Quote request and Thank you (Thank you for your reply.); then Type your own… and Don’t fill.

  3. Fill, then send it yourself

    Press Enter or Fill. Each filled field gets a mark next to it; press it to change just that field. The panel’s Change fields one by one button does the same, and Undo stays within reach. You decide whether to send, once you have checked.

    A “Contact us” form after filling: First name Avery, Last name Quintero, an email address, Phone +1 202 555 0143, Company, Street address, City Washington, State District of Columbia and ZIP code 20500, each with a blue ▼ mark beside it. The panel at the top right says “Filled 10 fields. Sending is up to you.” with Undo and Change fields one by one.

Checked against forms like these

Every time the fill engine changes, we run it against 53 sample forms in 9 languages (1,010 fields) and check three things: each value lands in the right field, fields that must stay empty stay empty, and nothing gets submitted.

The forms are our own, so this is not a promise about every real site. But all of them are public, and you can try the same ones yourself.

Split or single, filled to fit

The set includes 5 forms with a postal code split into boxes and 8 with a phone number in separate boxes. Whether a form wants first and last name apart or as one line, the profile value is shaped to fit.

Furigana and romanized names

6 forms ask for furigana (the reading of a Japanese name) and 4 for a romanized name. FormCarbon fills each from the matching part of your profile. It never guesses a reading from kanji.

Local conventions

Field labels are read in 9 languages (Vorname and Nachname, Prénom and Nom, 성 and 이름, and more). Name order, address layout and date format follow the region, so a German birth date goes in as 17.04.1990.

Forms built differently

3 React, 2 Vue, 2 Shadow DOM and 2 multi-step forms are in the set, so forms that look ordinary but are built differently are checked too.

Fields that must stay empty

23 forms with a password field, 7 with card numbers, 20 with hidden fields, 16 with honeypots (hidden fields that catch bots) and 4 with a field that submits when changed. That is 358 fields in all, and the current result is 0 filled and 0 submissions.

And when something doesn’t fit

On real sites, some fields won’t be recognized. They show up in the preview as orange rows that ask you to choose, so you can pick a value for that row or leave it empty. Nothing is written until you press Fill, Undo puts the form back, and nothing is ever submitted.

The same profile filled into forms from different countries, side by side.
Try it on sample forms

All 53 forms are public. Pressing their submit button sends nothing anywhere.

What it never fills

Some parts of a form should never be touched automatically. FormCarbon does not fill these on its own, and never submits.

Fields you cannot see
Only visible fields are filled. Hidden fields and bot traps are folded away at the end of the list.
Passwords, card numbers, one-time codes and files
Profiles cannot hold them, and FormCarbon never fills them from a profile. The only exception is a test password or test card number you pick in the preview in developer mode (Pro, see below).
Consent, terms and newsletter boxes
Never ticked by default. Only the boxes you tick in the preview are filled. With Pro’s automatic consent turned on, only the consent a form requires (terms, privacy) is ticked, never optional mailings.
Submitting
Never. It moves focus to the submit button and stops. Fields that would send the form when changed are left alone too.
Frames from other sites (iframes)
Not supported. FormCarbon works on the top page only and shows how many fields it skipped inside frames.

Developer mode For testing

For people who build or test forms, as part of Pro (free to try for 14 days after you install). Turn it on in the settings, and the preview offers made-up test data (names, addresses, email addresses and more) instead of your own details. Without an email alias, generated addresses use domains reserved for testing, such as example.com.

  • Made-up names, addresses, phone numbers, companies and dates of birth
  • A switch to fill only the required fields
  • A choice of region, and a fixed seed for the same data every time
  • An email alias (your own address with a +tag) and a run number
  • A throwaway test password for new-password fields and card numbers that payment providers publish for testing

Test passwords and card numbers go in only when you pick them in the preview, and are never saved. Do not use them for real sign-ups or orders.

The settings page, For developers. Developer mode (fill dummy data) is on. Region and repeat: names and addresses from United States, Fill the same data every time ticked, Seed 1234. What is made up: Name, Email, Phone, Address, Company, Date of birth, all ticked. Email alias and Run number, both off. Below, a sample of what will be filled: Ruby Rhodes, ruby.rhodes@example.net, (202) 555-0104, 3989 Cedar Ln, Washington, District of Columbia.

Free and Pro

There is no limit on how many times you fill. Pro saves you more steps on the sites you use often.

FeatureFreePro
Fills Unlimited Unlimited
Profiles 2 Unlimited
Every field type (name, furigana, contact, address, work, date of birth and more) Included Included
Preview and Undo Included Included
On / off per site Included Included
The profile you last used on each site Included Included
Consent boxes (tick them together in the preview) Included Included
Saved texts 3 per profile 50 per profile
Own fields 3 per profile Unlimited
Theme (light and dark) Included Included
Panel language (English, Japanese and 7 more) Included Included
Backup to a file and restore (plain JSON) Included Included
Per-site memoryRemembers the options, saved texts and field changes you pick, and fills them from the start next time. On Free you can still pick them for that fill. Not included Included
Fill on open (allowed per site) Not included Included
Tick the consent a form requires automaticallyIt never ticks optional mailings such as newsletters. Not included Included
Test data (developer mode)Made-up names, addresses, email addresses and more, with a choice of region, a fixed seed, a run number, an email alias, and test passwords and cards. Not included Included
Passphrase-protected backupsOpening a passphrase-protected file works on Free too. Not included Included

Every Pro feature works for 14 days after you install. No key is needed.

See Pro details

Compared with other tools

Already using Fake Filler or Form Filler? See when each one is the better fit, including when it is not FormCarbon: Fake Filler or FormCarbon, Form Filler or FormCarbon.

Questions

Which sites does it work on?

Forms on ordinary web pages. It cannot run on Chrome’s own pages (chrome://), the Chrome Web Store, PDFs or files on your computer (file:), and says why when you try.

Does it fill forms inside an iframe from another site?

Not in this version. It works on forms in the top page. Fields inside frames are counted under the list as not supported.

Where is my data stored?

Only in this browser’s extension storage (chrome.storage.local), and it is never sent to Quillfold. It is not synced with Chrome, so to move it to another device, export a backup from the settings page. Your data is not encrypted (the same as addresses saved in the browser).

What permissions does it use?

It always uses three: activeTab, scripting and storage, and reads only the tab where you press the button or the shortcut. Only for a site where you turn on Pro’s Fill on open does Chrome ask you to allow access to that one site (you can decline). Turning it off removes the access.

Can I open it with a keyboard shortcut?

Yes. The shortcut does the same as the toolbar button, and pressing it again fills the form. You can see and change the key at chrome://extensions/shortcuts; the current key is also shown under Shortcut in the settings.

My name and address are written differently on forms in other countries. What should I do?

FormCarbon fills values exactly as you saved them; it does not translate or transliterate. Save a second profile written the way those forms expect, and switch to it in the panel. Separate furigana and romanized name fields are there for Japanese forms that ask for them.

Can I change the panel’s language?

Yes. By default it follows Chrome’s language, and you can pick one of 9 languages under Language in the settings. Languages other than English and Japanese are translated from English, and the settings page says so.

What happens to my data if I uninstall it?

Removing the extension also removes your saved profiles and settings from the browser. To keep them, export a backup from the settings page first.

Extensions by Quillfold

Something not working?

Send the page URL and what the panel showed to support@quillfold.dev. What to include