Random four-digit passwords and PIN codes
The terms four-digit password, four-number password, PIN, and passcode are often used for the same format: a string of exactly four decimal digits. This tool returns that format immediately without adding letters or symbols.
How many 4-digit passwords are possible?
There are 10 choices for each of four positions, so there are 10 × 10 × 10 × 10 = 10,000 possible codes. Uniform random selection provides about 13.3 bits of entropy. That is limited protection without an attempt counter, delay, or lockout.
Can a four-digit password start with zero?
Yes. A code is a string rather than an ordinary whole number, so values such as 0007 and 0421 remain four digits. This generator preserves leading zeros.
Should repeated digits be allowed?
Yes. Values containing repeats are part of the 10,000-code space. Removing them changes the distribution and does not turn a four-digit code into a strong general-purpose password. The generated batch may also contain duplicate results because each result is an independent draw.
Where should I use a 4-digit password?
Use one only where four digits are required and online guessing is constrained—for example, a device or lock that limits failed attempts. Do not use a four-digit code as a website password when a longer random password or passkey is accepted. Avoid birthdays, years, addresses, phone-number fragments, keypad shapes, and reused PINs.
Frequently asked questions
Does the generator exclude common codes?
No. Excluding a published list would reduce and reshape the possible set. The generator selects uniformly; the system using the code must provide rate limiting or lockout protection.
Are the generated numbers stored?
No. Generation occurs in this browser tab. Copy or save a result securely before leaving the page if you need it.
Can I generate more than one code?
Yes. Choose any batch size from 1 to 100. Every line is generated independently.