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Token & Random String Generator

Generate cryptographically secure tokens, UUIDs v4, API keys, and custom random strings using your browser's built-in crypto API.

UUID v4

Standard universally unique identifier

Hex Token

Random hexadecimal string

Base64 Token

URL-safe Base64 random string

Alphanumeric

Letters and numbers only

Numeric PIN

Digits only - OTP / PIN code

Custom Charset

Define your own character set

Click Generate to create a token

About Token & Random String Generator — Random Token Generator Online

This random token generator online uses your browser's built-in crypto.getRandomValues() API to produce cryptographically secure random strings — the same source of entropy your operating system uses for security-critical operations. Developers, security engineers, and DevOps teams use it to generate API keys, session tokens, CSRF tokens, invite codes, OTP PINs, and UUIDs without needing a server-side script or third-party service.

Unlike Math.random(), which is a predictable pseudo-random function unsuitable for security use, crypto.getRandomValues() draws from the OS's CSPRNG (Cryptographically Secure Pseudo-Random Number Generator). Every token produced here is statistically unpredictable and safe to use as a secret. You can generate a single token or a batch of up to 100 at once, then copy them individually or all together.

How to Use the Token Generator

  1. Select a Token Type from the card grid: UUID v4, Hex, Base64, Alphanumeric, Numeric PIN, or Custom Charset.
  2. Set the Length — the number of characters in the output. UUID v4 is always 36 characters; all other types support 4–256 characters.
  3. If you chose Custom Charset, type the characters you want to draw from in the Custom Charset field (for example, ABCDEF0123456789 for uppercase hex).
  4. Set the Batch Count to generate multiple tokens at once — useful when seeding a database or generating a list of invite codes.
  5. Click Generate, then click Copy to copy the single token or Copy All to copy the entire batch as a newline-separated list.

Token Types and When to Use Them

Each token format has a different character set, length, and typical use case. Choosing the right format for your application makes tokens easier to handle and appropriate for their context.

  • UUID v4: The standard 128-bit identifier in 8-4-4-4-12 hyphenated hex format. Use this as a primary key in databases, a correlation ID in distributed systems, or anywhere a globally unique identifier is expected. The format is universally recognized by ORMs, APIs, and databases.
  • Hex Token: A string of lowercase hexadecimal characters (0–9, a–f). Ideal for API keys, session tokens, CSRF tokens, and webhook secret keys. A 32-character hex token provides 128 bits of entropy; 64 characters gives 256 bits.
  • Base64 URL-safe: Uses characters A–Z, a–z, 0–9, -, _ (no +, /, or = padding). This is the compact encoding used in JWTs, URL-safe cookies, and OAuth tokens. For the same entropy, Base64 tokens are ~25% shorter than hex tokens.

Tips for Getting the Best Results

Choosing the right token format and length is important for both security and compatibility. Here are practical guidelines based on common use cases.

  • Match length to required entropy: For security-sensitive tokens (API keys, session IDs, password reset tokens), aim for at least 128 bits of entropy. That's 32 hex characters, 22 Base64 URL-safe characters, or 43 alphanumeric characters. For tokens with a short expiry (e.g., 5-minute email verification codes), 64 bits (16 hex characters) is often sufficient.
  • Use Numeric PIN for human-readable codes: When generating OTP codes, voucher PINs, or verification codes that users will type manually, use the Numeric type with 6–8 digits. This avoids confusion with look-alike characters (0 vs O, 1 vs l) that can occur in alphanumeric codes.
  • Use Custom Charset for specific requirements: Some systems have character restrictions — for example, a legacy system that only accepts uppercase letters and digits. Type your allowed characters into the Custom Charset field and generate tokens that comply with those constraints without any post-processing.
  • Generate in bulk when seeding data: Set the Batch Count to the number of tokens you need, click Generate, then Copy All to get a newline-separated list. You can paste this directly into a spreadsheet, a SQL INSERT statement, or a CSV seed file.
  • Never reuse security tokens: Each call to Generate produces a fresh, independent token. For API keys and session tokens, each user, session, or resource should have its own unique token. Sharing tokens between entities breaks the security model and makes revocation difficult.

Why Use a Random Token Generator Online

Running token generation in the browser means there's no server that ever sees your tokens, no logs to worry about, and no network request that could be intercepted. The tool works offline once the page loads. There's nothing to install — no Node.js script, no Python library, no openssl command to remember. Just open the page and generate what you need in seconds.

This tool is particularly useful for developers setting up new projects, QA engineers populating test databases, and security teams validating that token lengths meet compliance requirements. It's also handy for system administrators who need to generate a few API keys quickly without spinning up a script.

Frequently Asked Questions about the Token Generator

Yes. All tokens are generated using window.crypto.getRandomValues(), the browser's Cryptographically Secure Pseudo-Random Number Generator (CSPRNG). This is the same entropy source used by your operating system for TLS key generation and password hashing. It is fundamentally different from — and far more secure than — Math.random(), which is predictable and must never be used for security tokens.
UUID v4 (Universally Unique Identifier version 4) is a 128-bit randomly generated identifier formatted as 8-4-4-4-12 hexadecimal characters, for example 550e8400-e29b-41d4-a716-446655440000. The v4 designation means 122 of those 128 bits are random; the rest encode the version and variant. The probability of two v4 UUIDs colliding is astronomically small, making them safe as unique keys in databases or distributed systems.
For API keys and session tokens, 128–256 bits of entropy is the industry standard. A 32-character hex string provides 128 bits; a 64-character hex string provides 256 bits. A 43-character Base64 URL-safe string also provides roughly 256 bits and is shorter to store. For short-lived tokens like email verification links or password reset URLs, 128 bits is sufficient. For long-lived API keys, prefer 256 bits. For OTP codes that users type manually, 6–8 digits is standard practice.
No. All token generation happens entirely in your browser using the Web Crypto API. No network request is made when you click Generate — the tokens exist only in your browser's memory and are never transmitted, logged, or stored anywhere outside your device. You can verify this by opening your browser's Network DevTools and confirming no requests are made on generation.
Yes, completely free. There are no usage limits, no account required, and no paid tier. You can generate as many tokens as you need — including batches of 100 at a time — without any restriction. The tool is supported by ads on the Oneyfy site, but all functionality is fully available at no cost.
Yes. Select the Custom Charset token type and type any characters you want into the charset field. The generator will draw randomly from exactly those characters when building each token. This is useful when you need tokens that comply with a system's character whitelist — for example, only uppercase letters and digits, or only characters that are safe to include in a URL without encoding.
Both formats encode random bytes as printable characters, but they use different character sets and have different lengths for the same entropy. Hex uses 16 characters (0–9, a–f), so each byte expands to 2 characters. Base64 uses 64 characters, encoding 3 bytes into 4 characters — roughly 33% more compact than hex for the same data. Use hex when the token must survive case-insensitive comparison or when hex is the expected format (e.g., SHA hashes, OAuth secrets). Use Base64 URL-safe for shorter tokens in URLs, cookies, or JWT headers.
Yes. Once the page has loaded, all token generation works without an internet connection because everything runs in the browser using the built-in Web Crypto API. There are no external CDN dependencies for the core generation logic. This makes it safe to use in restricted network environments or air-gapped setups.