4-Digit Random Number Generator creates fast, fair 4-digit codes from 0000 to 9999. Click Generate to see a smooth rolling animation for the first result, then get your full list instantly in the Generated list box. You can generate a single 4-digit number for quick use, or create a huge batch for testing, labeling, or bulk code workflows.
Features
1) Generate 1 to 1,000,000 four-digit numbers
Use How many numbers to set the size of your batch. The tool supports everything from a single code to very large lists.
- Single mode: generates one 4-digit result and also places it in the list box.
- Batch mode: generates many results, shows the first result in the rolling display, and fills the list box with numbers (one per line).
2) Rolling animation preview
The tool shows a fun rolling animation for the first generated number. This gives users a satisfying “draw” experience while still generating the full batch quickly.
3) Mouse-selectable 4-digit display
The animated result is displayed in a 4-tile layout, but it is also selectable as one continuous number. That means you can highlight and copy it with your mouse as 0756 instead of copying four separate lines.
4) Keep leading zeros
Enable Keep leading zeros to force every result to be exactly 4 digits long. This is important for PIN-style codes and any system where 0007 must stay 0007.
- On: outputs 0000-9999 in true 4-digit format
- Off: outputs numbers without leading zeros (example: 0007 becomes 7)
5) No repeats in the list (unique results)
Enable No repeats in the list to generate a list where every 4-digit code appears only once. This is useful for assigning IDs, tickets, or test codes where duplicates are not allowed.
Note: There are only 10,000 possible 4-digit values (0000-9999), so unique mode can generate up to 10,000 results.
6) No repeating digits inside a number
Enable No repeating digits inside a number to avoid codes like 1123 or 9009. Each 4-digit code will have four different digits.
7) Exclude common patterns
Enable Exclude common patterns to avoid easy-to-guess or overly common sequences, such as:
- Repeating digits: 0000, 1111, 2222
- Simple sequences: 0123, 1234, 4321, 9876
- Other obvious patterns commonly used as default codes
This is helpful for demos, temporary access codes, and any scenario where you want results that look less predictable.
8) Copy
Copy copies your generated result to the clipboard.
- If you generated 1 number, Copy copies that 4-digit number.
- If you generated a batch, Copy attempts to copy the full list when it is reasonably sized. For very large batches, Download is the more reliable option.
9) Download .txt
Download .txt exports your result as a plain text file. In batch mode, the file contains one 4-digit number per line, which is perfect for spreadsheets, QA testing, and bulk uploads.
10) Clear
Clear resets the rolling display and the generated list so you can start a new run quickly.
That’s how I created my own pin code
Frequently Asked Questions
1) What is a 4-digit random number used for?
People use 4-digit numbers for PIN-style codes, app testing, demo OTP screens, temporary access codes, lockers, raffle draws, games, and assigning short IDs.
2) Why do I need “Keep leading zeros”?
Many systems treat codes as exactly four characters, not a regular number. With leading zeros enabled, 0007 stays 0007, which matches how PINs and access codes are usually displayed.
3) Can the tool guarantee unique codes for a huge list?
Unique mode is limited to 10,000 results because there are only 10,000 possible 4-digit values from 0000 to 9999. If you need more unique codes, you will need longer codes, such as 5 or 6 digits.
4) Why exclude common patterns?
Patterns like 1234, 0000, or 1111 are extremely common and easy to guess. Excluding them helps produce codes that look more random and less “default.”
5) What does “No repeating digits inside a number” mean?
It prevents duplicates within one code. For example, 1123 repeats the digit 1, so it would be rejected. A code like 8052 is allowed because all digits are different.
6) Why is Download better than Copy for very large batches?
Clipboard copying can fail on some browsers when the text is huge. Download creates a file reliably, even for very large batches like hundreds of thousands of lines.
7) Is this random generator truly random?
The tool uses your browser’s built-in cryptographic random generator when available. That provides high-quality randomness for typical use cases like testing, drawing, and code generation.
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