Nano ID Generator
Generate compact, URL-safe unique IDs live — preset or custom alphabets, with entropy and collision-probability readouts.
About this ToolHow it works, benefits & use casesTap to collapse
Mint compact, URL-safe unique IDs with the nanoid algorithm and see their security properties as you go. A large live display shows the current ID and refreshes the moment you change a setting or press regenerate. You pick the length (1 to 64 via the slider, up to 256 in code) and choose an alphabet: the default 64-character URL-safe set, or presets like alphanumeric, lowercase, uppercase, numbers, hexadecimal, no-look-alikes, and a vowel-free "safe" set — or supply your own custom alphabet of unique characters. For every configuration the tool reports the entropy in bits, the alphabet size, and a plain-English collision note (roughly how many IDs you can mint before a 1% collision chance, derived from the birthday bound). Generate from 1 up to 1,000 IDs at once; bulk output is one per line and ready to copy, download, or pipe onward. Everything runs in your browser.
How to Use
- 1Pick an alphabet from the preset chips (default, alphanumeric, hexadecimal, no-look-alikes, and more) — or tick "Use custom alphabet" and type your own unique characters.
- 2Drag the Length slider to set how many characters each ID has.
- 3Set "Number of IDs" if you want a batch (up to 1,000).
- 4Read the live readout under the display: entropy in bits, alphabet size, and the collision estimate.
- 5Click the regenerate icon for fresh IDs, then copy the primary ID — or copy/download the full batch from the bulk output panel.
Key Benefits
- Generates compact, URL-safe IDs using the standard nanoid algorithm
- Eight built-in alphabets plus full custom-alphabet support
- Adjustable length and batch sizes up to 1,000 IDs
- Live entropy (bits) and birthday-bound collision estimate for each setting
- No-look-alikes and vowel-free "safe" alphabets for human-readable IDs
- Bulk output ready to copy, download, or pipe into another tool
- Fully client-side — IDs are generated in your browser
Common Use Cases
- Generating short, URL-safe primary keys or public-facing record IDs
- Creating database keys that are smaller than UUIDs but still collision-resistant
- Producing human-friendly codes with the no-look-alikes alphabet for coupons or invites
- Choosing an ID length by checking the entropy and collision readout for your volume
- Seeding test data or config files with a batch of unique identifiers
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Nano IDs are typically shorter than UUIDs while offering comparable collision resistance, and they are URL-safe by default. The default 21-character ID over a 64-character alphabet gives entropy similar to a UUIDv4, but you can shorten or lengthen it and pick a custom alphabet, which UUIDs do not allow.
It reports roughly how many IDs you can generate before reaching a 1% chance of any two colliding, calculated from the birthday bound using your chosen alphabet size and length. Use it to confirm a configuration is safe for your expected ID volume before committing to it.