NanoID is a small, modern ID format used to generate short, unique, URL-friendly identifiers. It is popular in web apps, APIs, databases, frontend state, and developer workflows because it creates compact random IDs without the length and formatting overhead of UUIDs.

Why use NanoID instead of UUID?

NanoID is often chosen when you want identifiers that are shorter, URL-safe, and easier to copy or display. UUIDs are widely supported and standardized, but NanoID can be more compact and flexible because you can control the length and alphabet.

Can I choose the length of the generated IDs?

Yes. You can set the NanoID length yourself. Shorter IDs are more compact, while longer IDs reduce the chance of collisions when generating large numbers of identifiers.

Can I use a custom alphabet?

Yes. In addition to preset alphabets like URL-safe, alphanumeric, lowercase plus numbers, hex, and numeric-only, you can enter your own custom alphabet to generate IDs that match a specific format or restriction.

Can I generate multiple NanoIDs at once?

Yes. You can generate one ID or hundreds in a single run, then copy the full list instantly. This is useful for test data, fixtures, import workflows, or pre-generated identifiers.

NanoID Generator - Free Online Tool

Generate NanoIDs instantly

A NanoID generator creates short, random, URL-friendly identifiers that are easy to use in apps, APIs, databases, and frontend workflows.

If you need something more compact than a UUID, NanoID is one of the most practical options available.

This tool lets you:

generate one or many NanoIDs at once
choose the length of each ID
select a preset alphabet or use a custom alphabet
create URL-safe, alphanumeric, hex, or numeric-only IDs
regenerate values instantly
copy the output in one click

Whether you are building a web app, testing database records, preparing demo content, or generating IDs for a workflow, this tool gives you a fast way to create NanoIDs without writing code.

What NanoID is

NanoID is a compact identifier format designed to generate short unique random strings.

A typical NanoID uses a URL-safe alphabet made from characters like:

uppercase letters
lowercase letters
numbers
safe symbols such as _ and -

Because the alphabet is URL-friendly, NanoIDs work well in:

URLs
database keys
API payloads
frontend state
filenames
invite links
public-facing references

NanoID is widely used by developers who want identifiers that are:

shorter than UUIDs
easy to copy and paste
safe to place in URLs
customizable in length and format

Why NanoID is useful

A lot of ID systems are either too long, too rigid, or too awkward for everyday product work.

NanoID solves that by giving you a format that is both compact and flexible.

It is especially useful when you want identifiers that:

look cleaner than long UUID strings
avoid separators and formatting noise
fit neatly into links and UI components
can be customized for a specific system
are easy to generate in bulk for testing or imports

For many teams, NanoID is a practical middle ground between fully standardized UUIDs and home-grown random strings.

What this tool does

This NanoID Generator is built to make ID creation fast and predictable.

You can:

generate 1 to 1000 IDs in one run
choose the length of each ID
select from common alphabets
define your own custom alphabet
regenerate instantly when you want a fresh set
copy the full result list from the output box

The tool is useful for both quick one-off IDs and larger lists for developer workflows.

How to use the NanoID Generator

1. Set how many IDs you want

Use the Count control to choose how many NanoIDs to generate.

Examples:

1 for a single ID
10 for a quick sample set
100 or more for test fixtures, imports, or seed data

2. Choose the ID length

Use the Length control to decide how many characters each NanoID should contain.

Shorter IDs are easier to read and share. Longer IDs reduce collision risk when generating larger volumes.

3. Pick an alphabet

Choose the character set used to build the IDs.

Available presets typically include:

Default URL-safe
Alphanumeric
Lowercase + numbers
Hex
Numbers only
Custom alphabet

4. Enter a custom alphabet if needed

If your system needs a specific character set, switch to Custom alphabet and type the exact characters you want to allow.

This is useful for:

internal product codes
human-readable IDs
systems with input restrictions
restricted-character environments
matching an existing identifier format

5. Generate or regenerate

The output updates as you change the settings, and you can also use Regenerate to create a fresh set instantly.

6. Copy the results

Use the copy button to grab the full output in one click.

Understanding the controls

Count

This controls how many NanoIDs are created.

Use smaller counts when:

testing a format
creating a single public ID
checking how a chosen alphabet looks

Use larger counts when:

generating fixtures
preparing import data
building sample datasets
testing uniqueness in a batch

Length

This controls how many characters appear in each ID.

A longer length means:

more possible combinations
a lower chance of collisions
less risk when generating large datasets

A shorter length means:

cleaner visual appearance
easier manual handling
shorter URLs or identifiers

Alphabet

The alphabet determines which characters can appear in the generated ID.

This matters because different workflows have different constraints.

For example:

URL-safe works well for web products and routes
Alphanumeric is useful for general IDs without symbols
Hex is useful when you want only 0-9 and a-f
Numbers only is useful for numeric reference codes
Custom is useful when your product or system has strict formatting rules

Custom alphabet

This lets you define your own character set.

Example custom alphabets:

ABCDEFGHJKLMNPQRSTUVWXYZ23456789
abcdef123456
0123456789
ABCDEF1234567890

This is helpful when you want to avoid ambiguous characters like:

0 and O
1 and l
I and l

Choosing the right NanoID length

There is no single perfect length for every project.

The right choice depends on how many IDs you expect to generate and how much collision resistance you want.

As a practical rule:

use shorter lengths for demos, prototypes, local state, and temporary client-side references
use standard or longer lengths for production identifiers, database records, and shared public references
increase length when you reduce the alphabet size, because fewer allowed characters means fewer total combinations

In other words:

bigger alphabet + longer length = more unique possibilities
smaller alphabet + shorter length = fewer unique possibilities

This tool gives you the flexibility to balance readability and uniqueness based on your use case.

Practical use cases

Generate database-friendly IDs

If you need compact random identifiers for records, NanoID can be easier to work with than long UUID strings.

Create URL-safe public references

NanoIDs are ideal for links, public routes, share URLs, and short references because the default alphabet is designed to be URL-friendly.

Build test data and fixtures

Need 50, 100, or 500 random IDs for development or QA? Set the count, choose a format, and generate them instantly.

Match an existing format

If your app uses a special character set, a custom alphabet lets you generate IDs that fit your product rules instead of forcing a generic format.

Create short codes for UI workflows

Shorter NanoIDs can be useful for visible identifiers in interfaces, provided the scale and collision requirements of the workflow allow it.

NanoID vs UUID

A common question is whether to use NanoID or UUID.

UUID

UUIDs are useful when you want:

a well-known standardized format
broad compatibility across tools and systems
a fixed structure with predictable formatting

But UUIDs are often:

longer
harder to read aloud
visually noisy because of hyphens

NanoID

NanoID is useful when you want:

shorter identifiers
URL-safe output
flexible length
custom alphabets
cleaner visual appearance

If you need maximum standardization, UUID may be the better fit. If you want flexibility and compactness, NanoID is often the better choice.

Common mistakes and how to avoid them

Using IDs that are too short

Very short IDs may look nice, but they give you fewer possible combinations.

If you plan to generate many values, increase the length.

Using a very small custom alphabet

A small alphabet also reduces the total number of possible IDs.

If you limit the allowed characters heavily, consider increasing the length to compensate.

Choosing an alphabet with confusing characters

For human-facing codes, characters like 0, O, 1, I, and l can be confusing.

A custom alphabet can help you avoid ambiguous characters.

Assuming every random string format behaves the same

Different tools use different alphabets, lengths, and randomness sources. NanoID is not just a generic random string—it is a specific approach to compact unique ID generation.

Why this tool is helpful

You can always generate NanoIDs in code, but that is often unnecessary for small everyday tasks.

This tool is useful when you want to:

test a format before implementing it
create IDs without opening a terminal
generate sample values for UI work
prepare demo or QA data quickly
compare different lengths and alphabets visually
copy a ready-made list into a spreadsheet, JSON file, seed script, or CMS

It removes the friction from a very common developer task.

Perfect for

developers building apps and APIs
product teams creating sample records
QA teams generating test identifiers
designers mocking realistic UI states
makers building invite links or short references
anyone who needs a flexible online NanoID generator

If you need short, secure, customizable IDs that are easy to generate and easy to use, NanoID is a strong choice.

Create one or hundreds of NanoIDs in seconds, adjust the length and alphabet to match your workflow, and copy the results instantly.