Numbers

Secure Random Token Generator

A secure random token generator produces high-entropy strings used to authenticate requests, protect user sessions, and guard against common web attacks. Whether you need a hex token for a database primary key, a base62 string for a URL-safe invite link, or a numeric PIN for two-factor verification, this tool covers the full range of common token formats. Choose from lowercase or uppercase hex, base36, base62, or purely numeric character sets, then dial in the exact length your system requires — anywhere from 8 to 128 characters. The group separator option is worth highlighting: splitting a token into chunks of 4 or 8 characters with dashes makes long strings dramatically easier to read, compare, and manually verify — useful for license keys, voucher codes, and activation strings that real humans have to type or proofread. Generate up to several tokens at once so you can seed a database table, populate a test suite, or create a batch of invite codes in one click. Each token is independently randomized, so no two will share a pattern even at the same length and charset setting. One important caveat: this generator runs in the browser using JavaScript's Math.random(), which is not cryptographically secure in the way that server-side functions like Node.js crypto.randomBytes() or Python's secrets module are. Treat the output as suitable for low-to-medium sensitivity use cases — mock data, testing, staging environments, invite codes — rather than production session tokens or private API keys where a cryptographically secure random number generator is required.

How to Use

  1. Set the Count field to the number of tokens you need — up to the available maximum.
  2. Set the Length field to match your system's requirement (32 for most API keys, 6 for PIN codes).
  3. Choose a charset from the Format dropdown: hex for crypto contexts, base62 for URLs, numeric for PINs.
  4. Optionally pick a dash separator (every 4 or 8 chars) if the token will be read or typed by humans.
  5. Click Generate, then copy individual tokens or the full list into your project, spreadsheet, or database.

Use Cases

  • •Generate placeholder API keys for local development and staging environments
  • •Create batch invite codes for a SaaS beta launch or referral program
  • •Produce readable license key strings using dash-separated 8-char hex groups
  • •Seed a database with unique token values for testing reset-password flows
  • •Generate numeric-only PIN codes for SMS two-factor authentication mockups
  • •Create URL-safe base62 tokens for shortened link or coupon code systems
  • •Supply CSRF token values for testing form submission security in QA
  • •Generate unique identifiers for IoT device registration during prototyping

Tips

  • →For license keys, use uppercase hex with a dash every 4 characters and a length of 16 — giving the classic XXXX-XXXX-XXXX-XXXX format.
  • →Base62 at length 22 gives you the same 128 bits of entropy as 32 hex characters, saving space in URLs and QR codes.
  • →Generate 20-30 tokens at once when seeding a test database — far faster than re-clicking for each row.
  • →Avoid numeric-only tokens shorter than 8 digits for any web-facing code; a 6-digit PIN has only 1 million combinations and is trivially brute-forced without rate limiting.
  • →When copying tokens for a .env file, use no separator and hex or base62 — many config parsers choke on dashes inside variable values.
  • →Use base36 over base62 when the token will appear in printed materials or be typed by non-technical users — removing uppercase prevents a/A and 0/O confusion.

FAQ

What is a hex token and when should I use it?

A hex token uses characters 0-9 and a-f (or A-F). It is the most common format for cryptographic output — SHA hashes, AES keys, and OAuth secrets are all typically hex. Use hex when interoperating with libraries or APIs that expect this encoding. A 32-character hex token represents 128 bits of data.

What is base62 format and why is it shorter than hex?

Base62 draws from 62 characters: digits 0-9, A-Z, and a-z. Because it has more symbols than hex's 16, the same amount of entropy fits into fewer characters. A base62 token is also URL-safe without encoding, making it ideal for invite links, coupon codes, and short identifiers embedded in URLs.

Are the tokens generated here cryptographically secure?

No. This tool uses JavaScript's Math.random(), which is a pseudorandom number generator not designed for security. For production use — session tokens, password reset links, API keys — generate tokens server-side using crypto.randomBytes() in Node.js, Python's secrets.token_hex(), or an equivalent cryptographically secure function.

How long should a secure token be?

128 bits of entropy is the standard security floor for most tokens, equivalent to 32 hex characters or roughly 22 base62 characters. For API keys and session tokens, 32-64 hex characters is common. For low-risk use cases like voucher codes, 12-16 characters is usually sufficient to prevent brute-force guessing.

What does the group separator do?

The separator option inserts a dash every 4 or 8 characters, turning a raw string like 'a3f9c21b' into 'a3f9-c21b'. This has no effect on the token's security or entropy — it is purely cosmetic. Use it for license keys, activation codes, or any token a person needs to read aloud or type manually.

What is base36 and how does it differ from base62?

Base36 uses digits 0-9 and letters a-z (26 letters), giving 36 total characters. Unlike base62, it is case-insensitive, which reduces transcription errors when users type tokens manually. Use base36 for short, human-readable codes like order confirmation numbers or referral slugs.

Can I use numeric-only tokens for PINs or OTPs?

Yes. Select the numeric charset and set your desired length (4, 6, or 8 digits are standard for PINs and one-time codes). Keep in mind that numeric tokens have far less entropy per character than hex or base62, so use longer lengths when guessing resistance matters. Numeric is best for UX-driven flows, not high-security authentication.

Why do all my tokens look similar in the first few characters?

They should not — each token is independently generated. If you notice patterns, try refreshing and regenerating. Because this tool uses Math.random(), there is a theoretical (very small) risk of clustering. For guaranteed uniqueness across thousands of tokens, generate them server-side with a cryptographically secure source.