Random Number Generator
Generate truly random integers between any range instantly in your browser. This tool also includes a dice roller, coin flipper, random name picker, and yes/no generator — all powered by JavaScript's Math.random() with no data ever sent to a server.
Random Number Generator
Multiple Random Numbers Generator
Random Number Between 1 and 10
Random Number Between 1 and 100
Random Number Between 1 and 1000
Dice Roller
Coin Flip
Random Name Picker
Yes or No Generator
How Random Numbers Are Generated
This tool uses JavaScript's built-in Math.random() function, which implements the xorshift128+ pseudorandom algorithm seeded by system entropy at page load. Each call returns a floating-point number uniformly distributed between 0 (inclusive) and 1 (exclusive). Multiplying and flooring that value maps it to any integer range. For everyday use — games, giveaways, decisions, and testing — this is more than sufficient. For cryptographic purposes such as generating secret keys or tokens, use crypto.getRandomValues() instead.
What Is a Random Number Generator?
A random number generator (RNG) is a tool or algorithm that produces numbers without any predictable pattern. Online RNGs like this one are pseudorandom — they use a deterministic algorithm seeded by an unpredictable value, producing output that is statistically indistinguishable from true randomness for everyday applications. True hardware random number generators exist for scientific and security purposes, but a software RNG is perfectly suited for picking lottery numbers, rolling dice, running giveaways, and making decisions.
Random Number Between 1 and 10
The 1–10 range is the most commonly needed range for quick decisions, guessing games, and choosing from small lists. Whether you're playing a guessing game, picking a number for a dare, or making a binary-style decision with more granularity than a coin flip, the dedicated 1–10 generator above produces a result in one click with no configuration needed.
Random Number Between 1 and 100
The 1–100 range is the standard for raffles, classroom activities, trivia games, and general randomness. Percentages and probabilities are naturally thought of in this range, making it intuitive for most people. The dedicated one-click 1–100 generator above requires no setup — just click and get your number.
Random Number Between 1 and 1000
The 1–1000 range is ideal for lottery-style draws, large contest pools, and generating test data for developers. It provides enough spread to make collisions unlikely in small samples. The dedicated 1–1000 generator above gives you a result instantly, and the Multiple Numbers Generator can produce hundreds of unique values in this range at once.
Random Number Picker
A random number picker is similar to a generator but is typically focused on selecting one value from a defined pool rather than producing an arbitrary number. The Multiple Random Numbers Generator section above functions as a full random number picker — set your range, choose a count, disable duplicates, and get a picked selection. For picking from a list of names or entries, use the Random Name Picker section which lets you manage the pool directly.
Dice Roller Online
The dice roller supports D4, D6, D8, D10, D12, D20, and D100 — all the standard polyhedral dice used in Dungeons & Dragons, Pathfinder, and other tabletop RPGs, as well as classic board games. Roll up to 20 dice at once, see each individual die result, and get the total sum automatically. No physical dice required.
Coin Flip Online
A coin flip is the classic tool for breaking ties and making quick binary decisions. Whether you're deciding who goes first, settling a debate, or assigning a task randomly, the coin flip above gives you a fair 50/50 result every time. The session statistics help you track streaks across multiple flips, which is useful for probability experiments and games.
Random Name Picker
Teachers use random name pickers to call on students fairly without bias. Contest organizers use them to draw giveaway winners. Team leads use them for random pairing or task assignment. The Random Name Picker above lets you paste any list of names, pick a winner with one click, remove that winner from the pool and pick again, or select multiple winners at once — all without repeats unless you reset the list.
How Does a Random Number Generator Work?
JavaScript's Math.random() uses the xorshift128+ algorithm, a pseudorandom number generator that is seeded by system entropy (such as CPU timing data) when the JavaScript engine starts. Each call advances the internal state deterministically, but the sequence is long enough — over 2128 values — that it never repeats in practice. The output is statistically uniform, meaning every value in a range has an equal probability of appearing. It is not truly random in the physical sense, but for games, decisions, and everyday applications it is indistinguishable from true randomness.
Is Math.random() Truly Random?
No — Math.random()is pseudorandom, not truly random. A truly random generator requires a physical source of entropy such as radioactive decay or atmospheric noise. Pseudorandom generators like xorshift128+ are deterministic — given the same seed they always produce the same sequence — but the seed itself is unpredictable. For games, giveaways, simulations, and everyday decisions, this distinction does not matter. For generating cryptographic keys or secure tokens, use the Web Crypto API's crypto.getRandomValues() instead.
Random Number Generator for Giveaways
To run a fair online giveaway, assign each entry a number and use the main generator to pick a single winning number. For name-based giveaways, paste all entry names into the Random Name Picker section and click "Pick a winner". You can copy the result to your clipboard as proof of the draw. If you need to pick multiple winners without repeats, the Multiple Random Numbers Generator with duplicates disabled handles that automatically and lets you download the full results list as a text file.
How to use Random Number Generator
- 1Set your range
Enter a minimum and maximum value in the Random Number Generator section. The default range is 1 to 100.
- 2Click Generate
Hit the Generate button to produce a random integer within your range. The result appears instantly as a large prominent number.
- 3Use the history log
The last 10 generated numbers appear as chips below the result so you can review previous picks at a glance. History resets when you refresh the page.
- 4Try the extras
Scroll down to use the dice roller, coin flip, random name picker, or yes/no generator — each section works independently.
- 5Copy or download your results
Use the Copy button to copy a single result to clipboard, or use Copy All and Download as TXT for lists of multiple numbers.
Frequently Asked Questions
How do I generate a random number between 1 and 100?
- Use the dedicated 'Random Number Between 1 and 100' section on this page — just click the button for an instant result. Alternatively, set Min to 1 and Max to 100 in the main generator and click Generate. Both methods produce a uniformly distributed random integer in that range.
Is this random number generator truly random?
- The generator uses JavaScript's Math.random(), which is a pseudorandom number generator seeded by system entropy. It is not cryptographically secure, but it is statistically uniform and perfectly suitable for games, decisions, giveaways, and everyday use. For cryptographic purposes, use the Web Crypto API instead.
How do I pick a random number without repeating?
- Use the Multiple Random Numbers Generator section and toggle 'Allow duplicates' off. The generator will ensure every number in the result list is unique. If you request more numbers than exist in the range, it will return all unique values in the range and show a warning.
Can I generate multiple random numbers at once?
- Yes. The Multiple Random Numbers Generator section lets you set a min, max, and count (up to 1,000). You can allow or disallow duplicates, copy the full list to clipboard, or download it as a plain text file with one number per line.
What is the best random number generator for a giveaway?
- For a giveaway with a numbered list of entries, use the main generator to pick a single winner number, or use the Multiple Random Numbers Generator to pick several without repeats. For name-based giveaways, paste all entries into the Random Name Picker and click 'Pick a winner'. The result can be copied for proof of fairness.
How does a dice roller work?
- Select the dice type (D4, D6, D8, D10, D12, D20, or D100) and how many dice to roll. Each die is rolled independently using a separate random call, and the individual results plus the total sum are displayed. This simulates a fair physical dice roll for tabletop RPGs and board games.
What is the probability of getting heads or tails?
- Exactly 50% for each. The coin flip uses Math.random() which returns a value uniformly distributed between 0 and 1. Values below 0.5 are Heads, values 0.5 and above are Tails. Over a large number of flips, results will approach 50/50.
How do I pick a random name from a list?
- Paste your list of names into the Random Name Picker textarea with one name per line, then click 'Pick a winner'. The tool shows the winning name and its position in the original list. You can remove the winner and pick again, or pick multiple names at once without repeats.
What is a pseudorandom number generator?
- A pseudorandom number generator (PRNG) produces sequences of numbers that appear random but are determined by an initial seed value. JavaScript's Math.random() uses an algorithm called xorshift128+ seeded by system entropy. The output is statistically uniform and unpredictable in practice, making it suitable for all non-security applications.
Can I use this random number generator for a lottery?
- You can use it to pick lottery-style numbers for informal draws and contests. Use the Multiple Random Numbers Generator with duplicates disabled to select unique numbers from a range. For official or legally binding lotteries, consult local regulations — certified hardware RNG systems are typically required.
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