NanoID Generator
Generate NanoIDs online — tiny, secure, URL-friendly unique identifiers. Customize length (1-100 chars) and character set, generate up to 100 at once.
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What is NanoID Generator?
NanoID Generator creates small, secure, URL-friendly unique identifiers. A default NanoID is 21 characters of URL-safe alphabet (A-Za-z0-9_-) offering ~122 bits of entropy — comparable to UUID v4 but at roughly 60% of the length and without characters that break in URLs. You can customize the length (1-100) and pick from six preset alphabets for use cases that need a different character set.
Key Benefits
- Shorter than UUID (21 vs 36 chars) and URL-safe
- ~122 bits of entropy at default length — near-zero collisions
- Cryptographically secure random source (crypto.getRandomValues)
- Customizable length and alphabet for any use case
- Tiny footprint — ideal for client-side and embedded use
Common Use Cases
- •URL-safe primary keys and slugs
- •Session and CSRF tokens
- •Short-lived cache and shareable link IDs
- •Frontend component and element keys
- •Microservice request correlation IDs
How to Generate NanoID
- Set quantity and length: Enter how many IDs to generate (1-100) and the desired character length (1-100). The default length of 21 gives strong collision resistance.
- Choose an alphabet: Pick a character set: URL-safe (default), alphanumeric, numbers only, lowercase/uppercase hex, or no-lookalikes.
- Click generate: Press the "Generate" button. Your NanoIDs appear instantly using a cryptographically secure random source.
- Copy the IDs: Click an individual ID to copy it, or use "Copy All" to copy every generated ID to your clipboard.
Key Features
- Tiny, secure, URL-friendly unique IDs
- Custom length from 1 to 100 characters
- Six preset alphabets (URL-safe, alphanumeric, hex, no-lookalikes)
- Bulk generation up to 100 IDs at once
- Cryptographically secure (uses crypto.getRandomValues)
- 100% client-side, no data sent to any server
Frequently Asked Questions
What is a NanoID?
NanoID is a tiny (130 bytes), secure, URL-friendly unique string ID generator. The default format is 21 characters long using a URL-safe alphabet (A-Za-z0-9_-) and provides collision resistance comparable to UUID v4, making it ideal for use in URLs, database keys, and short-lived tokens.
How does NanoID compare to UUID?
NanoID is shorter (21 chars vs 36 for a UUID), URL-safe (no hyphens or braces that need encoding), faster to generate, and smaller in bundle size. UUIDs are an established standard with broader ecosystem support. For new projects prioritizing compact, URL-friendly IDs, NanoID is usually the better choice.
Is NanoID cryptographically secure?
Yes. This generator uses the official nanoid library, which defaults to crypto.getRandomValues() — a cryptographically secure random number generator available in modern browsers and Node.js. The default 21-character length offers ~122 bits of entropy, giving a collision probability so low it is safe for virtually any application.
Can I customize the length and alphabet?
Absolutely. You can set the length anywhere from 1 to 100 characters, and choose from six preset alphabets: URL-safe (default), alphanumeric, numbers only, lowercase hex, uppercase hex, or no-lookalikes (which removes easily confused characters like 0/O and 1/l).