NanoID Generator — Compact Unique IDs
Generate compact, URL-friendly unique identifiers with configurable length and alphabet using cryptographic randomness.
How it works
- 1Configure your options above
- 2Click "Generate NanoID" — processing happens in your browser
- 3Copy or download the result
What to do next
About NanoID Generator
NanoID Generator is shaped around how people actually use developer utility utilities online: open the page, drop in a file, get the result. Generate compact, URL-friendly unique identifiers with configurable length and alphabet using cryptographic randomness. The interface stays out of the way once the work begins so the engine can use the available CPU and memory for the actual transformation.
The heaviest users of NanoID Generator tend to be devops engineers crafting one-liners, frontend developers prepping fixtures and students learning new languages. Each group brings slightly different expectations to the tool, but the same single-page architecture serves every one of them with the same response time.
NanoID Generator performs the transformation entirely inside the JavaScript runtime. Your file lives in the tab's memory while the engine works on it; the result lives in the tab's memory until the browser triggers the download. Both are released when the tab closes, the way every browser tab releases its memory.
NanoID Generator is implemented on top of standard browser APIs. Inputs are read from the file picker or drop zone, decoded in the browser, processed, and re-encoded into the output format. Files up to 0 MB are well within the comfort zone of any modern browser.
Reach for NanoID Generator when you need a predictable result on a single file. The page works on the first visit, the controls are visible without a menu, and the output is delivered the moment the engine finishes.
NanoID Generator is intentionally narrow in what it does, which makes it easy to slot into a longer workflow. Take its output, hand it to whichever next tool fits the job, and NanoID Generator stays out of your way until the next time you need it.
The download is delivered as a clearly named file the moment processing completes — no email link, no "your result will be ready in 5 minutes" queue, no expiry timer. The file is generated in your browser and saved by your browser's normal download flow.
The hard constraints are easy to remember. Maximum input: 0 MB. Multiple files per run: no — one input at a time, by design, to keep results predictable. The same controls apply on every run.
NanoID Generator is built around steady iteration on a small set of options rather than feature creep. Every additional setting attracts a slightly different audience, but a long settings panel makes the common case slower for everyone. The current controls reflect what users of the tool actually use.
A short note on how NanoID Generator came to look the way it does: every iteration started by watching how someone unfamiliar with the tool actually used it, then removing whatever got in their way. That is why the upload area dominates the screen, the run button is bigger than the secondary controls, and the result panel is unmissable when the job finishes.
A few practical tips that experienced users of NanoID Generator pick up over time. First, keep your default browser updated — the engine relies on standard web APIs and newer browser versions are noticeably faster than ones from a few years ago. Second, close other heavy tabs before processing a large input; the engine shares CPU and memory with whatever else is open. Third, if you re-run the same kind of job often, your last-used settings are remembered for the rest of the tab session, so subsequent runs are essentially one click.
If the result is not what you expected, the most common causes are easy to check. Confirm the input is under the 0 MB ceiling — files just above the cap fail silently because the engine refuses to allocate the buffer. Confirm the input is one of the supported formats. And if the page itself feels slow, try closing other heavy tabs to free up memory; the engine runs in your browser, so it competes for the same resources as everything else open.
As a single-page tool, NanoID Generator stays focused on one developer utility step. Multi-step workflows are composed by chaining adjacent tools — each tool produces a standard file the next one can read directly, so a longer pipeline is just a sequence of short tab-and-tab visits.
Open the workspace above to start using NanoID Generator. The engine loads on the first interaction so the page itself stays light, and once the tool is warm it processes subsequent jobs quickly. The moment the page is interactive, the tool is ready to do real work on your file.
How it works
- 1Open the NanoID Generator workspace above. The interface is a single page, so there is nothing to navigate.
- 2Select the developer file you want to process — drag-and-drop and the file picker both work.
- 3Tweak the controls if the defaults are not quite right for your input. The options are kept short and labelled in plain language.
- 4Click to start the job. The engine (standard browser APIs) processes the input in the page; you can watch the progress indicator until it completes.
- 5Download the result. The file is generated in your browser and saved through your normal download flow.
- 6Repeat the process for additional inputs whenever you need to. The page stays loaded, so subsequent runs are quick.
Common use cases
- Format a noisy log line into something a teammate can read using NanoID Generator.
- Convert between data formats while wiring up an integration.
- Generate boilerplate from a single specification line.
- Decode a token to confirm its claims during a debugging session.
- Encode binary content for transport in a JSON body.
- Generate a quick fixture without leaving the browser.
- Validate a config blob before pushing to staging.
- Inspect a regex against a test string before committing it.
FAQ
What is NanoID?
NanoID is a tiny, secure, URL-friendly unique string ID generator. The default alphabet uses A-Za-z0-9_- producing compact 21-character IDs by default.
Is it cryptographically secure?
Yes — this implementation uses crypto.getRandomValues, the same source of randomness used for cryptographic operations in browsers.
How does custom alphabet work?
The generator uses uniform random selection from your chosen alphabet, with bit-masking to avoid modulo bias.
What length should I use?
The default 21 characters with the default alphabet gives roughly 126 bits of entropy. Adjust based on your collision tolerance and ID volume.
Is it better than UUID?
NanoID is shorter and URL-safe by default. UUIDs follow a standard format recognized by databases. Choose based on your integration needs.
Is data stored anywhere?
No — IDs are generated entirely in your browser using the Web Crypto API.
Does NanoID Generator have an API?
NanoID Generator is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (standard browser APIs) is open-source and can be used directly from your own code.
Is NanoID Generator licensed for business use?
NanoID Generator can be used for personal and commercial work alike — there is no separate "business" licence to purchase. The output you generate is yours to use however you want, including in client deliverables, internal documents, or commercial products. Favtoo's only ask is fair, individual use; the tool is not designed to be embedded as a backend service or wrapped behind an API for resale.
Does NanoID Generator support batch processing?
NanoID Generator processes one input at a time by design — it keeps memory usage predictable on lower-end devices and makes results easier to verify. To handle a folder, run the tool once per file; the page stays loaded between runs and remembers your last-used settings, so the second run is essentially instant.
Which browsers are supported by NanoID Generator?
NanoID Generator works in any modern browser released in the last few years — Chrome, Edge, Firefox, Safari, Brave, Arc and the major Chromium derivatives are all supported. The underlying engine relies on widely-supported web APIs, so there is nothing exotic to install. If you are on a very old browser version and the tool fails to load, updating to the latest release of your preferred browser is the only fix needed.
How long does NanoID Generator take to process a file?
Most jobs finish in seconds. Speed scales with input size and with how many CPU cycles your browser tab has available — the engine runs in your browser, so it shares resources with whatever else you have open. For inputs near the 0 MB ceiling, expect anywhere from a few seconds to roughly a minute on a typical laptop. Closing other heavy tabs noticeably speeds things up.
Does NanoID Generator need an internet connection to run?
Once the page is loaded, NanoID Generator can complete jobs without an active internet connection — the engine is bundled with the page, so there is no per-job network call. The initial page load does require a connection (to fetch the static assets), but after that you can disconnect entirely and the tool will still work. This is a side-effect of the local-first architecture, not a deliberate "offline mode" feature.
Will NanoID Generator ask me to pay to download the result?
NanoID Generator is free to use. The processing runs in your browser, which keeps the per-user cost low enough that the tool can be offered openly. The download is the same file the engine produced — you can use it for as many runs as you need.
Does NanoID Generator work with screen readers?
NanoID Generator uses native HTML controls wherever possible, which means keyboard navigation, focus rings, and screen-reader labels work the way the platform expects. The drop zone accepts files via the keyboard-accessible file picker as well as drag-and-drop, and result downloads use standard browser download flows. If you spot an accessibility gap, Favtoo treats it as a bug worth fixing.