What does this tool do?
The OTP Generator creates one-time verification codes using your browser's cryptographic randomness engine. It is a practical tool for developers, QA teams and support staff who need numeric or alphanumeric codes between 4 and 20 characters long.
How to use it
- Choose the required options or length.
- Generate the secure result.
- Copy and store the result safely.
Real cryptographic randomness
Codes are generated with the browser's crypto.getRandomValues rather than the predictable Math.random(), which is a cryptographically strong generator backed by the operating system's secure entropy source. Numeric mode uses only the digits 0-9, while alphanumeric mode leaves out easily confused characters such as 0/O and 1/I, so codes are less error-prone when read aloud or typed by hand. You can batch up to 20 codes at once and copy them all together.
This is not a 2FA authenticator
This tool produces random, standalone codes; it does not generate time-based (TOTP) one-time passwords like Google Authenticator and does not sync with a shared secret key. It is ideal for test data, invite codes, temporary passwords, raffle tickets or fake SMS codes for exercising a verification flow. Every code is unique and fully random, and cannot be used to log in to an account.
Frequently asked questions
Does this generator give 6-digit 2FA codes like Google Authenticator?
No. This tool produces random codes, not time-based TOTP codes. Authenticator apps compute a synced code every 30 seconds from a shared secret key; the codes generated here have no such link.
What is the difference between numeric and alphanumeric?
Numeric mode uses only the digits 0-9 and suits SMS-style verification codes. Alphanumeric mode combines digits and uppercase letters, offering far more combinations at the same length and making it stronger for invite or coupon codes.
Can the same code be generated twice?
It is theoretically possible but very unlikely, depending on the length and type you choose. To guarantee uniqueness, increase the length and check generated codes against your application once before use.
Is OTP Generator free?
Yes. OTP Generator and all 300+ tools on MagmaNex are completely free with no signup or account required.
Is my data safe?
Yes. Everything runs locally in your browser. The data you enter is never sent to a server, stored, or shared.
Does it work on mobile?
Yes. OTP Generator works on phones, tablets and desktops — no app download needed.
🔒 Privacy: everything runs in your browser, your data is never sent to a server.