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Random Token Generator

Generate a cryptographically secure random token — in hex, Base64 or URL-safe Base64 — instantly in your browser. Built on the browser's CSPRNG, suitable for real secrets.

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Quick Answer

Choose a number of random bytes (4 to 128, default 32) and a format — hex, Base64 or URL-safe Base64 — and the tool returns a fresh secure token. It draws from the browser's cryptographic random generator (crypto.getRandomValues), so the result is suitable for real secrets like API keys, session IDs and CSRF tokens. The security comes from the bytes: 32 bytes is 256 bits of entropy. It runs entirely in your browser; nothing is uploaded.

What the Random Token Generator Does

This tool produces a random token of the length and format you choose. You set how many bytes of randomness you want and whether to encode them as hexadecimal, standard Base64, or URL-safe Base64, and it returns a fresh value each time you generate.

It is the quick way to create the kind of unguessable value that secures a web application — an API key, a session or CSRF token, a password-reset link, a nonce or a salt — without writing code to do it.

How It Works

The tool asks the browser's cryptographic random number generator for the number of random bytes you specify. This is a CSPRNG — a cryptographically secure source — which is the right tool for secrets, unlike ordinary random functions that are predictable and must never be used for security.

It then encodes those raw bytes into readable text. Hexadecimal uses two characters per byte; Base64 packs them more compactly; and URL-safe Base64 swaps the characters that would cause trouble in a URL or filename and drops the padding. The randomness — and therefore the security — is identical across formats; only the presentation differs.

Generation algorithm

  1. Choose bytes and format. Set how many random bytes you want (4 to 128) and pick hex, Base64 or URL-safe Base64.
  2. Draw secure random bytes. Request that many bytes from the browser's cryptographic random generator.
  3. Encode to text. Render the bytes as hexadecimal, Base64 or URL-safe Base64.
  4. Return the token. Show the token, ready to copy, with a fresh one on each generate.

Token entropy

entropy in bits = bytes × 8 hex length = bytes × 2 characters base64 length ≈ bytes × 4 ÷ 3 characters
Worked example
32 bytes → 256 bits of entropy → 64 hex characters (or about 43 URL-safe Base64 characters)

The security is in the byte count, not the character length. 16 bytes is 128 bits whether shown as 32 hex characters or about 22 Base64 characters — do not confuse how long the token looks with how strong it is.

Privacy

Your token is generated entirely on your device. There is no network request, so the value is never transmitted or stored anywhere by the tool.

Because it is local, the token is yours alone the moment it appears — but treat it as a secret: copy it into your secure store and do not share it.

Nothing persists between sessions — close the tab and the token is gone, so save any token you intend to keep.

Standards & references

  • Cryptographically secure randomness — The token is drawn from the browser's CSPRNG (crypto.getRandomValues), the correct source for secrets. Ordinary pseudo-random functions like Math.random are predictable and must never be used for tokens.
  • Token entropy (OWASP guidance) — OWASP recommends generating session tokens with a CSPRNG and at least 128 bits of entropy (16 bytes). The default 32 bytes gives 256 bits — comfortably above the minimum.
  • Encodings — Hexadecimal is two characters per byte; Base64 is more compact but can include characters awkward in URLs; URL-safe Base64 replaces those and removes padding, ideal for tokens in links and filenames.

Accuracy & Limitations

Because the bytes come from a cryptographically secure generator, the tokens are suitable for real security use — each value is unpredictable and effectively unique. This is the key difference from tools built on ordinary random functions.

The strength is set by the byte count, not the format. 16 bytes is 128 bits of entropy and 32 bytes is 256 bits, whether you display them as hex or Base64. A longer-looking hex string is not stronger than a shorter Base64 one with the same bytes.

A token is just random bytes — it carries no built-in meaning, expiry or signature. It is not a JWT (which has a payload and signature) and not a UUID (which has a defined structure). Pair it with your own storage and expiry logic.

Treat every generated token as a live secret. It is shown in your browser only, but once you use it for an API key or session it must be stored and transmitted securely, and rotated if exposed.

Real-World Use Cases

API keys

Generate an unguessable key for a service or integration.

Session and CSRF tokens

Create secure identifiers for web sessions and form protection.

Reset and verification links

Produce a one-time token for a password-reset or email-verification URL.

Nonces and salts

Get random values for cryptographic nonces or password salts.

When to use it — and when not to

Good for

  • API keys and secrets
  • Session, CSRF and reset tokens
  • Nonces and salts
  • URL-safe tokens (URL-safe Base64)

Not the best choice for

  • A structured identifier (use a UUID)
  • A signed, self-describing token (use a JWT)
  • Human-memorable secrets (use a passphrase)
  • Anything needing built-in expiry or meaning

For a standard structured ID, use a UUID generator. For a signed token carrying data, use a JWT. For something a person must type or remember, use a passphrase. This tool is for raw, high-entropy secret values.

Frequently Asked Questions

Are these tokens secure enough for production?
Yes. They are drawn from the browser's cryptographically secure random generator, which is the correct source for secrets. With the default 32 bytes (256 bits) they are well above common security minimums.
How many bytes should I use?
OWASP recommends at least 128 bits — 16 bytes — for session tokens. The default of 32 bytes (256 bits) is a safe, common choice. More bytes add margin at the cost of a longer token.
What is the difference between the formats?
Hexadecimal uses two characters per byte and is universally safe. Base64 is more compact but can include characters awkward in URLs. URL-safe Base64 swaps those and drops padding, making it ideal for tokens in links or filenames. The randomness is identical.
Does a longer token mean a stronger token?
Only if it has more bytes. The strength is the byte count, not the character length. 16 bytes is 128 bits whether shown as 32 hex characters or about 22 Base64 characters — the encoding changes the length, not the entropy.
Is this better than a Math.random token?
Yes, fundamentally. Math.random is a predictable pseudo-random function and must never be used for secrets. This tool uses the browser's cryptographically secure generator, which produces unpredictable values suitable for security.
Is a token the same as a UUID?
No. A UUID has a defined structure and is mainly an identifier; a token here is raw random bytes meant as a secret. Use a UUID generator for IDs and this tool for keys, session tokens and the like.
Is a token the same as a JWT?
No. A JWT is a structured, signed token that carries a payload. A token here is just random bytes with no built-in meaning, expiry or signature — you pair it with your own storage and rules.
Can two generated tokens collide?
With enough bytes it is astronomically unlikely. At 16 bytes (128 bits) or more, the chance of two random tokens matching is negligible, which is why high-entropy tokens are treated as unique.
Should I store the token?
Yes, if you need to keep it — nothing persists after you close the tab. Copy it into your secure store immediately, and treat it as a secret you do not share.
What is entropy?
A measure of unpredictability, in bits. Each random byte adds 8 bits, so 16 bytes is 128 bits and 32 bytes is 256 bits. More entropy means exponentially more possible values and a harder token to guess.
Is the token sent anywhere when generated?
No. It is created entirely in your browser with no network request. The value never leaves your device through this tool, so it is yours alone until you use it.
Can I use a token as a password?
You can — a hex or Base64 token makes a very strong password because of its high entropy. The trade-off is that it is not memorable. For a secret a person must type or recall, a passphrase is friendlier; for machine-to-machine secrets like API keys, a random token like this is the better fit.

References

Generates tokens from the browser's cryptographic random source (crypto.getRandomValues), not Math.random; honest that the security is in the byte count, not the encoded character length.

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