What it's for
Developers and testers need realistic dates of birth for sample accounts and form validation, for example checking that an over-18 rule rejects someone born yesterday 18 years ago. Teachers use random birthdays to demonstrate the birthday paradox: in a group of just 23 people, there's a better than 50% chance that two share a birthday. Generate 23 dates and see.
Dates are spread evenly across the chosen age range, and the age column is calculated for today. Don't use generated dates to impersonate anyone or to bypass age checks. To work out an exact age, use the age calculator.
Frequently asked questions
What is the birthday paradox?
In a group of 23 people, there is about a 50.7% chance that two share a birthday.
Are these real people?
No. They are random dates with no link to anyone.
How to use the Random Birthday Generator
- Enter your list, range or options.
- Set how many results you want.
- Press the button to draw.
- Draw again or copy the results.
Why use this Random Birthday Generator
100% in your browser
Nothing you enter is uploaded or stored.
Instant results
Updates as you type, no waiting.
Mobile friendly
Works on phones, tablets and desktops.
Light & dark mode
Follows your mfaysal.com theme.
Free, no account
No sign-up, no limits, no watermark.
Explained
Formulas, tables and sources on the page.
Random Birthday Generator: chart and reference data
Source: exact formula, 365 equally likely days
| Draw | Chance for each item |
|---|---|
| 1 from 10 | 10% |
| 1 from 30 (a UK class) | 3.33% |
| Same person twice in a row (30, with replacement) | 3.33% |
| Two of 23 sharing a birthday | 50.7% |
Random Birthday Generator compared with the alternatives
| Method | Fairness | Speed | Proof |
|---|---|---|---|
| This tool | Uniform (crypto RNG) | Instant | Screenshot |
| Names in a hat | Fair if mixed well | Slow | Witnesses |
| Math.random() scripts | Not cryptographic | Instant | None |
Who uses it in the UK
- Classroom name picks and team splits
- Giveaways and office raffles
- Creating secure passwords and IDs
- Games, quizzes and decisions
More questions
Is the result truly random?
The tool uses the browser's cryptographic random number generator (crypto.getRandomValues), which is suitable for fair draws and security uses. Every option has the same chance.
Can I use it for a raffle or giveaway?
Yes for informal draws. For UK prize draws and lotteries, check the Gambling Commission rules and keep a record (screenshot) of the draw.
Why did the same result come up twice?
Random does not mean evenly spread. With replacement, repeats happen naturally – see the birthday chart above.
Are my lists saved?
No. Names and lists stay in your browser tab and are gone when you close it.
✨ New: Remove the background from any image free – private, in your browser, transparent PNG.
Related free tools
Note: This free tool runs entirely in your browser. No data is sent or stored. Results are for information only.