For developers · Free forever
Realistic fake data.
Nothing leaves your browser.
Seed a database. Mock an API. Screenshot a UI with believable content. RandTools generates it all client-side — no signup, no rate limits, no data sent anywhere. Export JSON, CSV, or SQL. Copy to clipboard. Ship.
What devs use it for
Four workflows, every week.
Seeding development databases.
Drop 500 realistic users into Postgres without writing a faker script. Combo tools export JSON, CSV, or SQL inserts directly — paste and run.
Mock API responses.
Need a JSON blob that looks like a real user record for your stub server? The identity combo outputs a full shape — id, name, email, phone, address, DOB — ready to paste into your mock.
Testing input validation.
Grab 20 edge-case phone numbers, unicode names, long strings, invalid emails. Faster than writing a faker, and the outputs are visibly varied so your review is thorough.
UI reviews and screenshots.
Populating a dashboard for a design review? Generate 10 company names with founding dates, or 50 product SKUs, or a grid of avatars with consistent demographics.
The shortlist
Dev-essential atoms.
For bulk work
Combo generators.
Combo tools stitch atoms into structured records — a full fake identity with matching email and address, or a CSV of 500 mock customers. Export directly to JSON / CSV / SQL.
Why devs pick this
Four principles, no asterisks.
Runs in your browser.
Randomization is pure client-side JavaScript. Your generated data never touches our servers — nothing to leak, nothing to subpoena. Safe for regulated environments.
No signup, no rate limits.
Generate 10 rows or 10,000. The only limiting factor is your browser. We don't A/B test paywalls. We don't have paywalls.
Curated data, not scraped.
Name pools, place pools, and word pools are hand-curated — not LLM-generated slop. Outputs read like something a human could have written, because a human built the source lists.
Open to AI crawlers.
robots.txt welcomes GPTBot, Claude, and friends. If an AI assistant surfaced you here, that was intentional. Docs and tool names are written to be indexable by both.
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