NanoID Generator, Secure, URL-Safe Short IDs Online
Mint compact, collision-resistant Nano IDs instantly. Drag the size slider, pick or type an alphabet, generate up to 1,000 at once, and watch the collision probability update live, all client-side, nothing uploaded.
What is the nanoid generator?
The Nano ID Generator mints compact, URL-safe, collision-resistant IDs with a live size slider, alphabet presets or a custom alphabet, and bulk output up to 1,000. A real-time collision-odds estimate updates as you adjust settings. Free and fully in-browser, generation happens locally with nothing uploaded.
The GigAI NanoID Generator produces the same tiny, URL-safe, cryptographically-strong IDs as the popular `nanoid` library, but in a polished, keyboard-driven interface that runs entirely in your browser. A Nano ID is a modern alternative to the UUID: at the default 21 characters it packs roughly the same 126 bits of randomness as a UUID v4 into a shorter, cleaner string built from a URL-safe alphabet (A–Z, a–z, 0–9, plus `-` and `_`), so it drops straight into URLs, filenames, database keys and React `key` props with no encoding. This tool goes further than a bare generator: a live size slider from 2 to 64 characters, five ready-made alphabet presets (URL-safe default, numeric, lowercase, hex, alphanumeric) and a custom-alphabet field, bulk generation of 1 to 1,000 IDs at once, per-row and bulk copy, TXT and CSV export, a scrollable session history you can restore from, and (crucially) a real-time collision-probability estimate that recalculates from your chosen alphabet size, ID length and volume so you can pick parameters with confidence instead of guessing. Every ID is generated on your device using the Web Crypto random source. Nothing is sent to a server, stored or logged. Close the tab and every ID you made is gone.
- Difficulty:
- Easy
- Typical time:
- ~15s
- Processing:
- 100% browser processing
Last updated
How to use the nanoid generator
- 1
Set the length
Drag the size slider (2–64) to the ID length you want. The default of 21 matches the entropy of a UUID v4 in a shorter string.
- 2
Pick an alphabet
Choose a preset (URL-safe, numeric, lowercase, hex or alphanumeric) or switch to Custom and type your own character set.
- 3
Choose how many
Generate one ID or a bulk batch of up to 1,000. Watch the collision-probability badge update as you change length, alphabet and count.
- 4
Copy, export or restore
Copy a single row or the whole batch, export as TXT or CSV, or reopen an earlier batch from the session history below the output.
What NanoID Generator includes
Live size slider
Drag the length from 2 to 64 characters and every ID regenerates instantly, so you can dial in the shortest ID that still meets your uniqueness needs.
Presets + custom alphabet
Choose URL-safe (default), numeric, lowercase, hex or alphanumeric, or type your own character set, deduplicated and validated as you go, for readable or domain-specific IDs.
Live collision-odds estimate
A birthday-paradox calculator recomputes the probability of a collision from your alphabet size, length and volume in real time, so you size IDs with maths, not vibes.
Bulk up to 1,000
Generate a single ID or a batch of up to a thousand at once, each numbered, with per-row copy and one-click copy-all for seeding fixtures and databases.
Copy, export & history
Copy any row or the whole batch, export to TXT or CSV, and restore any previous batch from an in-session history that never leaves your browser.
100% in your browser
IDs are minted on your device from the Web Crypto random source. Nothing is uploaded, stored or logged, safe for IDs that seed real production data.
Why use our nanoid generator
Shorter than a UUID, just as unique
At 21 characters a Nano ID carries ~126 bits of entropy (on par with a UUID v4) in a URL-safe string 40% shorter, so keys and links stay compact and clean.
Right-size IDs with confidence
The live collision estimate tells you when a 10-character numeric code is fine and when you need 21 URL-safe characters, replacing guesswork with a concrete probability.
Drops in anywhere
URL-safe output needs no percent-encoding, so the same ID works in a URL, a filename, an object key, a React list key and a database primary key unchanged.
Private by design
Because generation is local, you can freely mint IDs that will key sensitive records: none of them, and no seed, ever leaves your machine.
Built for the way you work
From quick one-off fixes to daily workflows, see how people put this tool to use.
- Backend developer
Database primary keys
Generate URL-safe 21-character IDs as primary keys that are safe to expose in URLs and APIs, avoiding the length of UUIDs and the enumeration risk of auto-increment integers.
- Frontend developer
Stable React keys & DOM ids
Mint a batch of short IDs for list `key` props, form field ids or client-side records that need a stable, unique handle without pulling a library into the bundle.
- Product / Growth
Short share codes & slugs
Use a numeric or lowercase preset at a modest length to create human-friendly invite codes, referral slugs or short-link tokens, sizing them against the live collision odds.
- QA / Data engineer
Seed fixtures and test data
Bulk-generate up to 1,000 IDs, export them as CSV, and load them into fixtures or a seed script to give every test record a realistic, unique identifier.
Supported formats
Accepts Options, and produces TXT and CSV, all processed locally in your browser.
- Options
- TXT
- CSV
Frequently asked questions
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Common problems, solved
Hit a snag? Here are quick fixes for the issues people run into most.
My IDs contain '-' or '_' and break something downstream.
The default URL-safe alphabet includes '-' and '_'. If your consumer rejects them (some filename or CLI contexts), switch to the alphanumeric, hex or lowercase preset, or type a custom alphabet without those characters.
The collision probability looks alarmingly high.
That's the birthday paradox doing its job. Shorten alphabets and lengths concentrate risk fast. Increase the ID length, use a larger alphabet (URL-safe or alphanumeric), or lower the volume: the estimate updates live so you can find a safe combination.
My custom alphabet produced shorter-looking variety than expected.
Duplicate characters in a custom alphabet are removed before generation, because repeats would bias the distribution and add no entropy. The effective alphabet size shown reflects the unique characters only.
I need cryptographically secure IDs. Are these safe?
Yes. Nano IDs are generated from the platform's Web Crypto secure random source, not Math.random. They are suitable as unguessable identifiers, though a dedicated token/password tool is better for secrets you must keep truly secret.
Get the most out of it
Stick with the 21-character URL-safe default when in doubt. It matches UUID v4 entropy in a shorter, cleaner string.
Press Ctrl/Cmd+Enter to regenerate, Ctrl/Cmd+C to copy the whole batch, and Ctrl/Cmd+S to export.
Watch the collision-odds badge before shipping short numeric codes, small alphabets need more length than you'd think.
Use a custom alphabet without look-alike characters (0/O, 1/l/I) for codes people will read aloud or type by hand.
Generate a CSV batch to seed a database or fixtures, then diff two exports to confirm you never reused an ID.
What's new
Recent updates and improvements to the nanoid generator.
Initial release: live size slider, URL-safe/numeric/lowercase/hex/alphanumeric presets, custom alphabet, bulk 1–1,000, per-row and bulk copy, TXT/CSV export and session history.
Added the real-time birthday-paradox collision-probability estimate driven by alphabet size, length and volume, plus keyboard shortcuts and an in-tool shortcuts helper.
Custom-alphabet field now deduplicates characters and reports the effective alphabet size. Refined empty-state sample and dark-mode contrast.
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Your privacy is built in
Every Nano ID is generated entirely in your browser using the Web Crypto secure random source. Nothing is uploaded to any server. No ID, alphabet or seed is stored, logged or transmitted, so you can safely generate identifiers that will key real production or personal data. Close the tab and every trace is gone.
- Runs in your browser
- No uploads
- Nothing stored
Ready to try the nanoid generator?
Free, private and instant. NanoID Generator runs right in your browser.