Best random form filler extensions 2026
randumb vs Fake Filler vs Mockaroo — locale-coherent fake data generation for testing, QA and demos, compared honestly.
why locale-coherence matters for fake data
- Form validation often rejects a French postcode paired with a German phone format — incoherent data produces false test failures.
- Staging environments with mixed-locale data skew analytics dashboards, making country-level reports meaningless.
- Demo screenshots with "John Smith" at "12 Rue de la Paix, Lyon" look broken and erode client trust immediately.
- randumb keeps every identity field in the same country — name, surname, street format, postcode, phone prefix and email domain all match.
form filler with 58 locales and country-coherent identities. right-click any field, get a complete fake persona that makes geographic sense.
- 58 locales — every field matches the same country
- right-click context menu to fill any input
- bulk CSV export — 10 / 100 / 1,000 rows
- works offline — no API calls, no telemetry
- Chrome, Firefox and Edge — all three stores
- no account, no sign-up, no rate limits
- auto-detects default locale from browser language
the most popular random form filler extension for Chrome. fills fields with random data, but does not enforce locale coherence across identity fields.
- popular — large install base
- right-click + keyboard shortcut fill
- custom field rules via regex
- Chrome only — no Firefox or Edge
- locale fields can mismatch (US name, UK postcode)
- no bulk CSV export
- no multi-locale toggle panel
a web-based fake data generator with a broad field-type library. no browser extension — you generate and download data outside the browser, then paste it in.
- many field types (50+) including custom formats
- CSV / JSON / SQL / Excel export
- API access for automated test seeding
- web app only — no right-click to fill
- requires leaving the page you are testing
- free tier limited to 1,000 rows/download
- no locale-coherent identity bundles
a free API and web interface that generates random user data with nationality support. useful for seeding databases, but requires leaving the form or writing API code.
- nationality filter — some locale awareness
- free API with generous rate limit
- JSON / CSV output for code integration
- no browser extension — cannot fill forms directly
- must write code or copy-paste manually
- limited to ~60 nationalities without custom config
- no right-click workflow
feature comparison
key differences between randumb and the main alternatives.
| feature | randumb | Fake Filler | Mockaroo | Random User |
|---|---|---|---|---|
| locale-coherent identities | ✓ all fields match | ✗ can mismatch | ~ per field only | ~ nationality only |
| right-click to fill | ✓ | ✓ | ✗ web app | ✗ web app / API |
| number of locales | 58 | ~20 partial | 50+ via fields | ~60 via API |
| Firefox support | ✓ | ✗ | N/A | N/A |
| Edge support | ✓ | ✗ | N/A | N/A |
| bulk CSV export | ✓ up to 1,000 rows | ✗ | ✓ paid tiers | ✓ via API |
| works offline | ✓ no network calls | ✓ | ✗ requires internet | ✗ requires API |
| no account required | ✓ | ✓ | ~ free tier ok | ✓ |
| postcode format by locale | ✓ | ✗ generic | ~ per field | ✓ |
| phone format by locale | ✓ | ~ limited | ✓ per field | ✓ |
| pricing | free | free | free / paid | free |
| where available | Chrome + Firefox + Edge | Chrome only | web app | web / API |
use-case verdicts
right-click fill keeps you in the page. locale-coherent data avoids false validation failures. works on Chrome, Firefox and Edge — wherever your QA browser is.
if you need bulk rows for a DB seed script, randumb's CSV export (up to 1,000 rows, coherent locale) is faster to reach. Mockaroo wins if you need custom field types beyond names and addresses.
screenshots need identities that look real. a French demo with a German phone and a UK postcode looks broken. randumb generates coherent personas that read correctly at a glance.
frequently asked questions
-
What is the best Chrome extension to fill forms with fake data?
randumb by vøiddo is a free Chrome, Firefox and Edge extension that fills any form field with coherent fake data across 58 locales. Unlike most form fillers, it keeps the identity country-consistent — a French identity gets a French name, a French street address, a French phone format and a French postcode. Right-click any input field to fill it instantly. No account required.
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How is randumb different from Fake Filler?
Fake Filler is a popular Chrome extension for filling forms with random data, but it does not guarantee locale-coherent identities — you can end up with a US name paired with a German address and a UK phone number. randumb enforces country coherence across all 58 supported locales: name, address, postcode, phone format and email domain all match the same country. randumb is also available on Firefox and Edge, while Fake Filler is Chrome-only.
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Does randumb work on Firefox and Edge?
Yes. randumb is available on Chrome (Chrome Web Store), Firefox (Mozilla Add-ons) and Microsoft Edge (Edge Add-ons store). It is one of the few fake data / random form filler extensions available across all three major browsers simultaneously.
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Can I export fake data to CSV with randumb?
Yes. randumb includes a bulk CSV generator. Select a locale, choose 10, 100 or 1,000 rows, and download a CSV of coherent fake identities in one click. This is useful for populating test databases, seeding staging environments or generating sample data for demos — without needing to open Mockaroo or write a script.
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Is randumb free to use?
Yes. randumb is completely free. There is no Pro tier, no account required, no usage limits and no telemetry. It is available on Chrome, Firefox and Edge at no cost.
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What locales does randumb support?
randumb supports 58 locales across Europe, North America, South America, Asia and Oceania. Each locale includes country-specific name databases, street formats, postcode patterns and phone number formats. You can toggle individual locales on or off in the options page and set a default locale that matches your browser language automatically on first install.
install randumb free
58 locales. country-coherent. right-click.
form filler that keeps names, addresses, postcodes and phone numbers in the same country. free on all three major browsers.
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